Artigos de revistas: "Teeth Abrasion"

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Jakarta1, Ngatemi poltekkes, e Erna Sariana. "Hubungan Karakteristik dan Kebiasaan Menyikat Gigi dengan Kejadian Abrasi Gigi Pada Pegawai Yayasan Masjid Al-ikhlas Cilandak Jakarta". ARKESMAS (Arsip Kesehatan Masyarakat) 4, n.º 2 (29 de fevereiro de 2020): 185–90. http://dx.doi.org/10.22236/arkesmas.v4i2.3746.

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ABSTRACT Abrasion is damage to dental tissue due to foreign objects, such as toothbrushes and toothpastes that contain abrasive ingredients. Abrasion caused by brushing teeth in a horizontal direction and with excessive emphasis. This study aims to obtain an overview of the relationship between the characteristics and habits of brushing teeth with the incidence of dental abrasion in employees of the Al-Ikhlas Masjid Cilandak Foundation in Jakarta. This research is a descriptive study with a cross sectional design. The research sample used total sampling totaling 32 employees of Masjid Al-Ikhlas Foundation. Data collection through direct interviews and observations by filling out checklist sheets and dental abnormalities (tooth abrasion) cards. Data analysis was conducted in univariate and bivariate. The results of univariate analysis showed that the incidence of tooth abrasion was mostly in the high category (53.1%), employee age> 38 years (56.3%), female sex (56.3%), tooth brushing frequency <3 times (62, 5%), and the tooth brushing technique is mostly good (56.3%). The results of bivariate analysis, variables that were significantly associated with dental abrasion events were the frequency of tooth brushing (p = 0.035 and OR = 7,000), and tooth brushing techniques (p = 0.029 and OR = 7.333). Keywords: Dental abrasion, characteristics, and habit of brushing teeth

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Nam, Jinsu, Duong Hong Nguyen, Seungjun Lee, Seok-Mo Heo e Junyoung Park. "Simulation of Non-Carious Cervical Lesions by Computational Toothbrush Model: A Novel Three-Dimensional Discrete Element Method". Sensors 22, n.º 11 (31 de maio de 2022): 4183. http://dx.doi.org/10.3390/s22114183.

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Non-carious cervical lesions (NCCLs) are saucer-shaped abrasions of a tooth. NCCLs can form due to various etiologies, including toothbrushing wear, acid erosion, and mechanical stress. Owing to this complex interplay, the mechanism of NCCLs in tooth abrasion has not been established. This study aims to develop a numerical method using a computational toothbrush to simulate NCCLs. The forces acting on the teeth and the amount of abrasion generated were evaluated. The discrete element method using in-house code, connected particle model, and Archard wear model were applied for brushing. In the toothbrush model, 42 acrylic tufts were fixed into a toothbrush head. The teeth models with enamel properties comprised four flat plates and two grooves to simulate the anterior teeth and NCCLs. The brushing speed and depth for one cycle were established as simulation parameters. The force applied within the ununiform plane was concentrated on several bristles as the toothbrush passed through the interproximal space. The brushing force (depth) had a greater effect on tooth abrasion than the brushing speed. Toothbrushing abrasion was mainly concentrated in the interproximal space. Therefore, forceful tooth brushing can cause NCCLs from the interproximal space to the cervical area of the tooth.

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Sharma, Eeshita, Manjit Kumar, Rohit Sharma, Ajay Bansal e Sumit Katoch. "Comparative Evaluation of Bond Strength between Ridge Lap Surface of Acrylic Teeth and Denture Base Resin: An In Vitro Study". Dental Journal of Advance Studies 07, n.º 01 (28 de março de 2019): 012–18. http://dx.doi.org/10.1055/s-0039-1684881.

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Abstract Statement of Problem Acrylic teeth are preferred to porcelain teeth in dentures as they unite chemically with denture base resin, but their fracture from denture is common. Purpose The purpose of this study was to improve the bond strength of denture teeth to acrylic resin denture base by chemical or mechanical modification of the ridge lap surface of denture teeth. Materials and Methods Total 100 artificial cross-linked acrylic resin central incisors were divided into five groups: group A, 20 samples without modification (control group); group B, 20 samples (ridge lap surface of teeth treated with monomer); group C, 20 samples (ridge lap surface of teeth treated with monomer and the glaze layer removed with aluminum oxide abrasive stone); group D, 20 samples (ridge lap surface of teeth treated with dichloromethane); and group E, 20 samples (dichloromethane application followed by abrasion with aluminum oxide stone on ridge lap surface of teeth). They were mounted on wax blocks, and the blocks were acrylized. The bond strength values were obtained by subjecting the samples to shear compressive load under universal testing machine. Result The results were subjected to statistical analysis by applying analysis of variance and Bonferroni test for multiple group comparisons, and graphs were plotted. The mean value of bond strength was highest for group E (modified by aluminum oxide abrasion prior to dichloromethane application), followed by group C (modified by aluminum oxide abrasion prior to monomer application), group D (modified by dichloromethane application), group B (modified by monomer application), and lastly group A (control group). Significantly improved bond strength values were obtained in modified groups as compared with the control group. Conclusion Dichloromethane application followed by aluminum oxide abrasion provided the highest bond strength and is recommended to prevent debonding of the teeth from the denture base.

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Freitas, Karina Matthes de, e Helena de Freitas Oliveira Paranhos. "Weight loss of five commercially available denture teeth after toothbrushing with three different dentifrices". Journal of Applied Oral Science 14, n.º 4 (agosto de 2006): 242–46. http://dx.doi.org/10.1590/s1678-77572006000400006.

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Brushing is the most common cleansing method employed on complete dentures and it may damage the integrity of acrylic resin, the main component of this type of prosthesis. This study evaluated the abrasion resistance of artificial teeth with different number of acrylic layers, and the abrasiveness of specific and non-specific dentifrices for denture cleaning. The abrasion test was conducted by a tooth brushing device, using soft toothbrushes under load (200g). Sixty artificial teeth specimens were manufactured, 12 from each brand: Vipi-Dent Plus (Dental Vipi), Trubyte Biotone (Dentsply), Trilux (Ruthinium), Ivostar (Ivoclar) and SR Vivodent PE (Ivoclar). Three brands of dentifrices were selected: Colgate (Colgate-Palmolive), Bonyplus (Bonyf AG) and Dentu-Creme (Dentco). Distilled water was used as control. The brushing time was 100 minutes, at 356 strokes/minute. The specimens were weighed on an analytical balance before and after the abrasion test. Analysis of dentifrices' abrasive particles was made by scanning electron microscopy (SEM). Two-way ANOVA and Tukey tests were employed (alpha=0.05). The general mean of weight loss values were obtained: 6.1 mg (Ivostar); 6.0 mg (Trilux); 5.9 mg (Trubyte); 5.8 mg (Vipi); 5.3 mg (Vivodent). The abrasiveness difference among teeth brands was not statistically significant. The Colgate dentifrice produced the greatest weight reduction (10.1 mg), followed by Dentu-Creme (7.6 mg). Bonyplus was the least abrasive (2.4 mg), similar to the distilled water used as control group (3.1 mg) (p=0.05). It was concluded that all acrylic teeth presented similar abrasion resistance. Specific dentifrices for dentures tend to cause less damage to acrylic resin.

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Subbotin, R. S., S. B. Fishchev, A. V. Lepilin, A. A. Kondratyuk e M. N. Puzdyreva. "Comparative characteristics of masticatory muscle tone in patients with compensated and decompensated increased teeth abrasion". Periodontology 24, n.º 2 (29 de abril de 2019): 150–56. http://dx.doi.org/10.33925/1683-3759-2019-24-2-150-156.

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Relevance. Increased dental abrasion frequent nosological form of dentistry. In young people, PSZ is less common (6.3%) than in middle-aged people (32.7%), as well as people of older age groups (11.8-20.6%). Among foreign researchers, "rejuvenation" of increased teeth abrasion is noted in many countries, including developed ones. In the UK, in dental clinics, this pathology is 30% among people under 30 years and 42.6% among people 30-50 years, in Sweden – 29.9%, in the United States of America – 25%. To study the tone of the masticatory muscles in patients with various forms of increased teeth abrasion.Material and methods. A myotonometric examination and orthopedic treatment of 185 patients of the second period of adulthood (35-60 years) with increased abrasion of teeth in the clinic of dentistry of St. Petersburg state pediatric medical University.Results. The paper presents qualitative indicators of myotonometry of masticatory muscles in patients with compensated and decompensated increased abrasion of teeth, which are compared with the norm.Conclusion. A characteristic feature of patients with a compensated form of increased teeth abrasion is the absence or slight decrease in the height of the gnatic part of the face and increased functional tone of the masticatory muscles. For decompensated increased teeth abrasion is characterized by a combination of abrasion with a decrease in the height of the lower face and reduced functional tone of the masticatory muscles.

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Mucić, Dinka, e Marija Đurić-Srejić. "Abrasion of Teeth in Population Groups from Historical Periods in the Region of Former Yugoslavia". Dental Anthropology Journal 11, n.º 1 (7 de setembro de 2018): 7–10. http://dx.doi.org/10.26575/daj.v11i1.218.

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This study investigated the frequency, type, and degree of abrasion on permanent teeth from 694 skulls from archaeological sites dating from the beginning of the first century AD to the beginning of the twentieth century in the former Yugoslavia. The conclusions are: 1) 100% of the specimens had dental abrasion; 2) the Roman Age and Middle Ages teeth had a horizontal-vertical type of abrasion, while New Age teeth had a predominantly horizontal type of abrasion; and 3) Roman Age and the Middle Ages groups had the most severe loss of dental hard tissue.

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Razumova, S. N., Y. S. Kozlova, A. S. Brago, H. Barakat e A. S. Manvelyan. "Evaluation of the Roughness of the Enamel Surface According to Profilometry Data (Pilot Study)". Medical alphabet, n.º 34 (13 de janeiro de 2023): 14–18. http://dx.doi.org/10.33667/2078-5631-2022-34-14-18.

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The right choice of home hygiene products: toothbrush and toothpaste are an important aspect. The combination of different hardness of toothbrush and varying abrasiveness of tooth paste has not been fully explored.Aim. To study the effect of a soft brush on the enamel surface according to profilometry data.Materials and methods. For research, a special device was used to simulate the annual brushing of teeth. Abrasion was carried out on 6 extracted teeth, according to periodontal indications. Samples size was 1x1cm from 6 teeth removed for periodontal indications. Abrasion was carried out with a soft brush without the addition of paste on samples № 1,2,3 and with a soft brush in combination with a low abrasive paste with RDA 35 on samples № 4,5,6. The results of profilometry data were recorded at following time points - the initial state of the tooth, 1 week, 1 month, 6 months, 1 year.Conclusion. Using only a soft brush without toothpaste does not change the roughness of the tooth surface while simulating an annual brushing and the combination of a soft brush with a low abrasive paste polishes the enamel surface.

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Mitic, Nadica, Aleksandar Mitic, Vladimir Mitic, Vojin Savic e Marija Nikolic. "Tooth macromorphological and ultrastructural analysis of osteological material from the medieval locality of St. Panteleimon Church in Nis". Srpski arhiv za celokupno lekarstvo 138, n.º 11-12 (2010): 699–705. http://dx.doi.org/10.2298/sarh1012699m.

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Introduction. Analysis of macromorphological and ultrastructural tooth characteristics of osteological material from the medieval site of St. Pantaleimon Church in Nis provides us with insight on the life, nutrition and habits of medieval population, as well as the structure and composition of their teeth. Objective. The aim of this research, based on the tooth inspection of skeletal remains from the medieval site of St. Pantaleimon Church in Nis, was to analyze macromorphological characteristics , ultrastructure of the dental tissue of maxillary and mandibular molars, canines and incisors, as well as their chemical composition. Methods. Macromorphological and ultrastructural analysis of the dental tissue of osteological material dating from the 12th century included 1312 teeth with advanced abrasion. Macromorphological changes were detected by using a dental mirror, probe and radiography. After irrigation, the teeth were prepared using the standard procedure and analyzed by scanning electronic microscopy (JEOL-JSM-5300). Chemical analysis was done by expanded downscaling (EDS) method for Mg, P, Ca. Results. The analysis detected second degree abrasions of all teeth in individuals aged 20-25 years. Third and fourth degree abrasions of teeth were detected in individuals aged over 40 years. Ultrastructural analysis showed a complete obliteration of dentin tubules and pulp of the lower incisors, the apposition of intratubular dentin inside the tubules, as well as extensive deformity and loss of dentin structure on molars with preserved pulp volume and nerve fiber calcification. The calcification of nerve fibers showed that the formation of intratubular dentin was proportional with the biological potential of pulp and the degree of abrasion, and inversely proportional with the size of dentin surface. Chemical analysis showed that in the analyzed teeth Ca composition was slightly lower than that in the control group, P composition was almost identical, while Mg composition was multiply increased in comparison to the control group consisting of today?s persons of matching age and examined teeth as the medieval individuals. Conclusion. Different ultrastructural tooth characteristics as a part of the complex masticatory system of the medieval man are the result of individual and the whole community adaptation to actual living conditions. Nerve fibers calcification of the pulp can explain the absence of pain despite the high level of dental abrasion.

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Kulkarni, Rahul S. "Esthetic and Functional Rehabilitation of a Patient with Abrasion, Attrition, and Missing Teeth". International Journal of Prosthodontics and Restorative Dentistry 4, n.º 2 (2014): 52–55. http://dx.doi.org/10.5005/jp-journals-10019-1107.

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ABSTRACT The loss of tooth substance due to attrition and abrasion may lead to sensitivity to hot and cold, compromised esthetics, loss of anterior guidance and decreased masticatory efficiency. This case report describes the oral rehabilitation of a patient with abrasion, attrition and missing teeth. Treatment consisted of endodontic treatments of multiple teeth followed by their full coverage restorations, and fixed partial dentures for replacement of missing teeth. Esthetic and functional rehabilitation resulted in patient satisfaction, and no complications were noted related to the treatment after 1 year. How to cite this article Kulkarni RS. Esthetic and Functional Rehabilitation of a Patient with Abrasion, Attrition, and Missing Teeth. Int J Prosthodont Restor Dent 2014;4(2):52-55.

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Qiu, Chang Ming, Yan Feng Wang, Shu Ming Xing e Li Jun Guo. "The Failure Mechanism of Bucket Teeth of Electric Excavator Used in Metal Mine". Advanced Materials Research 580 (outubro de 2012): 185–88. http://dx.doi.org/10.4028/www.scientific.net/amr.580.185.

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Bucket teeth of electric excavator used in metal mine bear severe impact and friction, so their life is short and this have an negative effect on productivity. The paper analyzes the case of failure and material of bucket teeth, and researches into the mechanism of abrasion of bucket teeth and distinguishing feature of the work hardening of ZGMn13, and draw the conclusion that it is correct to choose ZGMn13 as material of bucket teeth used in metal mine. Improve configuration of bucket teeth or enhance the abrasion resistance can prolong the service life.

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Tkachenko, Iryna M., Yaroslav Y. Vodoriz, Iryna Y. Marchenko, Maryna A. Shundryk, Dmytro M. Korol e Olena V. Gurzhiy. "CHANGES IN ELECTROMYOGRAPHY TEST RESULTS OF PATIENTS WITH PATHOLOGICAL ABRASION OF TEETH. THE ROLE OF ANTERIOR TEETH IN THE PROCESS OF REHABILITATION". Wiadomości Lekarskie 72, n.º 4 (2019): 553–57. http://dx.doi.org/10.36740/wlek201904109.

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Introduction: Abrasion of teeth significantly affects electromyography results. Analyzing electromyograms of patients who needs complex rehabilitation, it is necessary to note absence of dissociation of the structure, appearance of spontaneous activity in one of the muscles, presence of the prevailing chewing side, appearance of low-amplitude oscillations in biocurrents. The aim: The purpose of this study was to determine the role of anterior teeth in the rehabilitation of patients with increased abrasion. Material and methods: The experimental group involved patients (men and women) aged 20 to 59 years with increased abrasion of teeth I-III degrees. Patients were provided with all the necessary complexes of rehabilitation measures: direct restorations with composite materials using the adhesive system of the Vth generation (in case of light abrasion), indirect ceramic restorations (severe abrasion). All work was conducted in accordance with the Declaration of Helsinki (1964) and was approved by the Ethical Committee of the academy. Results: Activity of the right masseter muscle was slightly higher than that of the left one (313.42 ± 97.96 ms. against 226.69 ± 35.39 ms. respectively). At the same time the resting time of the left and right masseter muscles slightly differs (300.57 ± 30.93 ms. and 307.96 ± 49.47 ms. respectively). Conclusions: Rehabilitation of patients with increased abrasion using combined methods (direct composite restorations with the adhesive system of Vth generation and indirect ceramic restorations), give the possibility to restore the masticatory function (evidenced by an increase in the activity of right and leftmasseter muscle on 2%, a decrease in the rest phase on 20% almost and an increase in amplitude on 2.9%).

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Collados, Javier, Carlos Garcia e Carlos A. Rice. "Dental Pathology of the Iberian Lynx (Lynx pardinus), Part I: Congenital, Developmental, and Traumatic Abnormalities". Journal of Veterinary Dentistry 35, n.º 3 (31 de agosto de 2018): 195–208. http://dx.doi.org/10.1177/0898756418793578.

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The Iberian lynx is an endangered felid that has been subject to an intensive ongoing conservation program in an attempt to save it from extinction. Identification of dental pathologies could play an important role in the survival of this endangered species. The objective of this study is to evaluate the dental pathologies (congenital, developmental, and traumatic abnormalities) of this species of felid. Skulls of 88 adult specimens of the Iberian lynx ( Lynx pardinus) from the Doñana Biological Station [Estación Biológica de Doñana-Consejo Superior de Investigaciones Científicas] (EBD-CSIC), Seville, Spain, were examined macroscopically, and full-mouth dental radiographs of all specimens were performed. Presence, absence, form of teeth, number of roots, supernumerary teeth, and persistent deciduous teeth were evaluated. The presence of attrition/abrasion, tooth fractures, enamel hypoplasia/hypomineralization, endodontic disease, intrinsically stained teeth, and other traumatic findings were also evaluated. Abnormal grooves and dilacerations were the most common abnormalities seen in the roots of teeth. Two hundred and fifteen fractured teeth (11.3% of evaluated teeth) were detected, and mainly complicated fractures were noted in maxillary canine teeth (24.2% of fractured teeth) and mandibular canine teeth (16.7% of fractured teeth). Endodontic disease was present in 3.9% of the teeth examined. Intrinsic tooth staining was assessed in 8.5% of evaluated teeth. Of all teeth examined, 831 teeth (43.7% of evaluated teeth) exhibited some type of attrition/abrasion. Our study concluded that there is a high prevalence of dental fractures and attrition/abrasion with associated endodontic disease that could lead to impaired hunting ability as well as a threat to overall health and subsequent survival of this endangered species.

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Oginni, Adeleke O., Cornelius T. Bamise e Adeyemi O. Olusile. "An Analysis of the Etiological and Predisposing Factors Related to Dentin Hypersensitivity". Journal of Contemporary Dental Practice 9, n.º 5 (2008): 52–59. http://dx.doi.org/10.5005/jcdp-9-5-52.

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Abstract Aim To determine the prevalence of different etiological factors of dentin hypersensitivity in patients and to provide information on their association with dentin hypersensitivity. Methods and Materials Twenty-nine patients (17 male, 12 female) suffering from pain of dentin hypersensitivity were recruited to participate in the study. A relevant history was taken and dentin hypersensitivity confirmed by using air-blast and tactile stimuli. Results All patients were right-handed. The left side of the mouth showed a preponderance of gingival recession, abrasion, abfraction, and erosion while more teeth on the right side showed attrition. Gingival recession and attrition were common among the molars, abrasions among the molars and premolars, abfraction among the premolars, while erosive lesions were predominantly found among the incisors. A total of 911 teeth were examined in the 29 subjects presenting with dentin hypersensitivity. The following conditions were found to be associated with the dentin hypersensitivity: 43 of 117 teeth (36.8%) with gingival recession; 41 of 99 teeth (41.4%) with attrition; 40 of 67 teeth (59.7%) with abrasion; 16 of 25 teeth (64%) with abfraction; and 32 teeth had erosive lesions all associated with hypersensitivity. Conclusion Gingival recessions followed by attrition were the most commonly found etiological factors leading to dentin hypersensitivity. Erosive lesions were mostly associated with dentin hypersensitivity. A statistically significant relationship exists between dentin hypersensitivity, tooth wear lesions, and gingival recession. Clinical Significance This study provides clinical evidence supporting the notion of dentin hypersensitivity being a tooth wear phenomenon. Therefore, successful preventive and management strategies for sufferers of dentin hypersensitivity must take into consideration causal factors for tooth wear and gingival recession. Citation Bamise CT, Olusile AO, Oginni AO. An Analysis of the Etiological and Predisposing Factors Related to Dentin Hypersensitivity. J Contemp Dent Pract 2008 July; (9)5:052-059.

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Ranjan, Manish. "Association of age and gender of patients undergoing class V tooth coloured restoration in maxillary teeth". Bioinformation 16, n.º 12 (31 de dezembro de 2020): 1121–27. http://dx.doi.org/10.6026/973206300161121.

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It is of interest to assess the association of age and gender of patients undergoing class V tooth colored restoration in maxillary teeth. Records were collected by reviewing the data of 86,000 patients of which 1580 patients had undergone class V tooth colored restoration in maxillary teeth. Patients were divided into age groups 18-30, 31-40,41-50,71-80 years. The most common age group who had undergone class V restoration was in the age group 41-50 years (30.8%). Cervical abrasions were the most common (79%). Most of the patients underwent direct restoration (87.7%). Direct restoration was found to be more prevalent in the age group 41-50 years due to cervical abrasion.

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Ranjan, Manish. "Association of age and gender of patients undergoing class V tooth coloured restoration in maxillary teeth". Bioinformation 16, n.º 12 (31 de dezembro de 2020): 1121–27. http://dx.doi.org/10.6026/973206300161121.

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It is of interest to assess the association of age and gender of patients undergoing class V tooth colored restoration in maxillary teeth. Records were collected by reviewing the data of 86,000 patients of which 1580 patients had undergone class V tooth colored restoration in maxillary teeth. Patients were divided into age groups 18-30, 31-40,41-50,71-80 years. The most common age group who had undergone class V restoration was in the age group 41-50 years (30.8%). Cervical abrasions were the most common (79%). Most of the patients underwent direct restoration (87.7%). Direct restoration was found to be more prevalent in the age group 41-50 years due to cervical abrasion.

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Koval, Yu P., V. M. Dvornyk, L. B. Yerys e Ya V. Koval. "ANALYSIS OF MODERN ETIOLOGICAL FACTORS OF PATHOLOGICAL ABRASION DEVELOPMENT OF HARD TISSUES OF TEETH (ACCORDING TO LITERATURE SOURCES)". Ukrainian Dental Almanac, n.º 3 (23 de setembro de 2020): 29–33. http://dx.doi.org/10.31718/2409-0255.3.2020.05.

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Relevance. Tooth abrasion is an inevitable consequence of their evolutionarily determined purpose of acquiring food through predation, detention, capture, grinding, chewing and swallowing. The mechanism of odontogenesis, according to which the amelogenesis of enamel ends with the death of ameloblasts before eruption, makes it impossible to recover enamel after damaging. Accordingly, any damage of any source is reflected on the hardest and oldest remains of creatures with teeth forever. Thus, tooth abrasion has a multifactorial origin and is based on diet and eating habits, oral hygiene, bruxism, brushing habits, xerostomia, anorexia, gastro-oesophageal reflex disease, vomiting, bulimia, and medications. Because enamel is the most wear-resistant tissue, the hardness and thickness of the enamel become evolutionary responses to environmental and dietary changes. In different periods of human development, there were certain, inherent in the time and territory of residence, taste preferences, eating habits, cooking methods, popular dishes. Constant acceleration, efforts to be on time everywhere, urbanization and industrialization have forced people to adapt, change their habits, including food. Fast food has become popular: chips, nuts, crackers and other snacks. Sour sauces and various salad dressings are added to them. A large selection of carbonated sweet drinks, or containing natural juices, gradually displace the habit of plain water drinking. On the other hand, modern fast-paced life causes increased nervous load, chronic stress, irritability and constant fatigue, which in turn affects the tone of the masticatory muscles. In addition, it is necessary to take into account the presence of somatic diseases, behavioral habits, individual characteristics of the bite, working conditions. Impact of numerous factors lead to changes of old hard tissues. Different types and forms of tooth abrasion are a great example of this. Among the non-caries lesions that develop after the eruption of permanent teeth, tooth abrasion is a common problem. Purpose of the research: to study contemporary etiological factors of developing of tooth abrasion (according to the literature). Object of the research: sources of domestic and foreign literature. Results of the research. According to the opinion of some authors, tooth abrasion is an irreversible loss of tooth substance caused by physical, chemical and mechanical factors excluding caries and acute injury. Note, there are several factors present in each clinical case and one of them is dominant. Currently, there is a significant increase in tooth abrasion prevalence because of contacts with acids that are present in food, drinks and gastric juice. This pathology is a complex condition and its progress depends on influence of chemical, biological and behavioural factors. Tooth abrasion is not present in all people, who are predisposed to this disease. The relationship between enamel genes and tooth abrasion propensity has been identified. The prevalence is higher among males. There is a proved connection between changes in the gene responsible for the enamel creation and lower tendency to abrasion in females. Analyses have shown a significant connection between variation in enamel genes and less susceptibility to tooth abrasion in women. Thus, the occurrence of tooth abrasion can be genetically determined and have a gender difference. This can be explained by the fact that men have better developed masticatory muscles. In young people, who visit gyms more commonly, tooth abrasion is the prevalent diagnosis especially local forms. In patients with bruxism, the forces applied to the teeth are bigger and the tooth abrasion is higher too. Peculiarities of occlusion are also possible factors of tooth abrasion. The most prominent tooth abrasion occurs in patients with straight bite. Teeth and jaws development abnormalities also cause tooth abrasion. People aged 45-64 and 65+ were 1.3 and 1.4 times more likely to have teeth with moderate to severe abrasion, respectively, compared to people aged 18-44. In adult men, the prevalence of tooth abrasion is 20% higher than in adult women. Adults who have used occlusal splints have a higher prevalence of tooth abrasion than those who have never used them. The prevalence of the disease in children older than 12 years was found to be 50% lower than in children younger than 12 years. No association was found between tooth abrasion and orthodontic treatment, absence of teeth, race or ethnicity. There is a close connection between the frequency and degree of tooth abrasion and age of workers, as well as work experience in harmful production. There is a growth of the pathology among workers of antimony and mercury industries. Damaging factors exist in the process of production of iron ore. Moreover, the height of the city above sea level changes the dynamics and clinical picture of the disease too. The highest rate of the horizontal type was found in (78.3%) people living in alpine zone, while in the medium mountains it was 68.4%. In the low-mountains the prevalence of the horizontal form of tooth abrasion was 46.9% only. Localized tooth abrasion in alpine areas is almost twice as frequent (65.5%) as the generalised forms (34.7%). Localized tooth abrasion was more typical for urban residents, and generalised for rural. Socio-economic status can also contribute to tooth abrasion. In their study, the authors found a much higher value of it in the lowest socio-economic category. This link between brushing teeth and socioeconomic factors may be related to diet, lifestyle habits, oral health awareness, or the choice of prosthetic techniques. Conclusion. Based on the study of sources in domestic and foreign literature, the authors showed great interest in the problem of the prevalence of tooth abrasion. However, the question of the etiology of the localized form is given insufficient attention, which requires further study.

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Pavlenko, Svetlana A., Elena V. Pavlenkova, Iryna M. Tkachenko, Alla I. Sidorova, Yaroslav Y. Vodoriz e Andriy V. Samoylenko. "CHANGES IN THE FUNCTIONAL CONDITION OF THE MASTICATORY MUSCLES WITH INCREASED TEETH ABRASION". Wiadomości Lekarskie 72, n.º 5 (2019): 1002–6. http://dx.doi.org/10.36740/wlek201905209.

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Introduction: The term “pathological abrasion” (increased abrasion) can be described as a loss of tooth hard tissue on the occlusal, oral, vestibular surfaces of teeth or in the occlusal area. Treatment of increased abrasion of teeth is a difficult task for the practical work of a dentist. The choice of the optimal treatment plan provides the greatest likelihood of long-term success and minimal probability of complication appearance. The aim of our work was to study the functional activity of the masticatory muscles in the pathogenesis of the development of increased abrasion of tooth hard tissues. Materials and methods: In order to achieve the goal of the study, an examination of patients aged between 19 and 69 years old was carried out in order to identify the number of persons with increased abrasion of teeth. During the examination of all patients one control and one researched group were formed. The patients of the control group (30 patients aged from 18 to 60 years) which had intact dental rows with any signs of increased tooth wear. The investigated group consisted of 25 patients, aged from 18 to 60 years. Depending on the complex treatment, the patients of the second group were divided into two subgroups. Subgroup 2A - (10 patients) with increased abrasion of tooth hard tissues with planned complex treatment of the disease without additional use of mouthguards after the end of treatment. For the patients from the 2B subgroup (15 people with increased abrasion of tooth hard tissues) a mouthguard was prescribed after the end of the complex treatment. In order to study some peculiarities of the muscular activity of the maxillofacial region an electromyogram was taken from all participants before treatment and repeated in a six- and twelve-months term. Results and conclusions: In our opinion, all manifestations of increased tooth abrasion are associated with changes in the muscular system, the motor apparatus and the nervous activity of the body. Regarding to this, the study of the propria muscular system and the related bone system can justify the usage of one or another prevention ortreatment of the pathology. Based on the results of our research, we can conclude that the study of the functional state of the muscle complex is a fairly reliable prognostic sign in the study of such a disease as an increased tooth abrasion.

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I. M. Tkachenko. "The use of a removable tray-bus for orthopedic treatment of increased abrasion of teeth complicated by the phenomena of bruxism". Bukovinian Medical Herald 17, n.º 1 (65) (2 de fevereiro de 2013): 129–32. http://dx.doi.org/10.24061/2413-0737.xvii.1.65.2013.32.

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The results of a study of occlusal contacts with increased abrasion of the hard dental tissues are presented in the paper. A new technique for determining supercontacts with an elevated abrasion of the teeth with the symptoms of bruxism is described. A study of high contact points will, enable in the future, to conduct therapeutic and preventive measures in order to normalize occlusal relations, when treating and preventing enhanced abrasion.

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Stepanov, D. A., V. S. Leibenko, E. A. Stepanov, E. A. Koretskaya e L. A. Zyulkina. "Changes in the dentition with increased tooth abrasion". Stomatology for All / International Dental review, n.º 2020 3 (92) (setembro de 2020): 30–34. http://dx.doi.org/10.35556/idr-2020-3(92)30-34.

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In the article the analysis of the changes in the dentoalveolar system occurring with increased abrasion of the teeth is carried out, the features of these changes and the compensatory capabilities of the dentoalveolar system with pathological abrasion are considered. It was concluded that the observed rearrangements on the part of many structures of the maxillofacial region (jaw bones, temporomandibular joint, teeth, muscles) should be established during diagnosis and treatment should be planned taking into account the morphological and functional changes that have arisen on the part of all elements of the dentition, which will help improve the effectiveness of treatment.

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Leite, Fábio Renato Manzolli, Ticiana Sidorenko de Oliveira Capote e Angela Cristina Cilense Zuanon. "Application of the total etching technique or self-etching primers on primary teeth after air abrasion". Brazilian Oral Research 19, n.º 3 (setembro de 2005): 198–202. http://dx.doi.org/10.1590/s1806-83242005000300008.

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Since the use of air abrasion has grown in pediatric dentistry, the aim of this study was to evaluate, by means of shear bond strength testing, the need to use the total etching technique or self-etching primers on dentin of primary teeth after air abrasion. Twenty-five exfoliated primary molars had their occlusal dentin exposed by trimming and polishing. Specimens were treated by: Air abrasion + Scotchbond MultiPurpose adhesive (G1); 37% phosphoric acid + Scotchbond MP adhesive (G2); Clearfil SE (G3); Air abrasion + 37% phosphoric acid + Scotchbond MP adhesive (G4); Air abrasion + Clearfil SE (G5). On the treated surface, a cylinder of 2 mm by 6 mm was made using a composite resin (Z100). Duncan's test showed that: (G2 = G3 = G5) > (G1 = G4). The use of a self-etching primer on air abraded dentin is recommended to obtain higher bond strengths.

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Milosevic, Alex. "Abrasion: A Common Dental Problem Revisited". Primary Dental Journal 6, n.º 1 (março de 2017): 32–36. http://dx.doi.org/10.1177/205016841700600104.

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Dental abrasion is most commonly seen at the cervical necks of teeth, but can occur in any area, even inter-dentally from vigorous and incorrect use of dental floss. Acid erosion has been implicated in the initiation and progress of the cervical lesion, while tooth-brush abrasion has long been held as the prime cause of cervical abrasion. Identification of the risk factors is clearly important in order to modify any habits and provide appropriate advice.

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Anja, Baraba, Dukić Walter, Chieffi Nicoletta, Ferrari Marco, Sonja Pezelj Ribarić e Miletić Ivana. "Influence of Air Abrasion and Sonic Technique on Microtensile Bond Strength of One-Step Self-Etch Adhesive on Human Dentin". Scientific World Journal 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/368745.

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The purpose of thisin vitrostudy was to evaluate the microtensile bond strength of one-step self-etch adhesive to human dentin surface modified with air abrasion and sonic technique and to assess the morphological characteristics of the pretreated dentin surface. The occlusal enamel was removed to obtain a flat dentin surface for thirty-six human molar teeth. The teeth were randomly divided into three experimental groups (n= 12 per group), according to the pretreatment of the dentin: (1) control group, (2) air abrasion group, and (3) sonic preparation group. Microtensile bond strength test was performed on a universal testing machine. Two specimens from each experimental group were subjected to SEM examination. There was no statistically significant difference in bond strength between the three experimental groups (P> 0.05). Mean microtensile bond strength (MPa) values were 35.3 ± 12.8 for control group, 35.8 ± 13.5 for air abrasion group, and 37.7 ± 12.0 for sonic preparation group. The use of air abrasion and sonic preparation with one-step self-etch adhesive does not appear to enhance or impair microtensile bond strength in dentin.

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De Sena, Francisica Fatima, e Santana Martins. "The Tradition of Brushing Teeth with Betel Nut Peel with Abrasion Incidents in the Salele Community Tilomar Timor Leste Country". Jurnal Kesehatan Gigi 9, n.º 2 (30 de dezembro de 2022): 91–94. http://dx.doi.org/10.31983/jkg.v9i2.8824.

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ABSTRACTSalele Timor Leste people have long known betel leaf, betel nut, and lime as ingredients for betel or toothbrush. The behavior of brushing teeth with betel nut peel is one way to take care of teeth which was believed by the ancestors. There are positive and negative effects on dental health. From a positive point of view, it inhibits the process of caries formation, while the negative effects of brushing teeth with betel nut peel on the teeth and gums can cause discoloration of the teeth (stain), periodontal disease on the oral mucosa, lesions on the oral mucosa, poor oral hygiene, atrophy of the tongue mucosa and can cause abrasion.This research is an analytic observational study with a cross-sectional approach. The sample size used is 25 respondents with purposive sampling technique. The data were analyzed by univariate analysis (frequency distribution) and bivariate analysis (rank Spearman correlation test) to determine the relationship between the traditional habit of brushing teeth with betel nut peel on the incidence of abrasion. The results showed that there was a significant relationship between the tradition of brushing teeth with betel nut peel on the incidence of tooth abrasion. The frequency of brushing your teeth with betel nut peel more than twice a day can have bad effects on oral and dental health.

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HIYOSHI, Katsunori, Syouji MURAI, Ken HAYASHI e Taichirou HIRAI. "Measurement of the abrasion of radioactive teeth by dentifrices." RADIOISOTOPES 39, n.º 5 (1990): 222–25. http://dx.doi.org/10.3769/radioisotopes.39.5_222.

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Kawano, Fumiaki, Takafumi Ohguri, Kenji Oka, Tetsuo Ichikawa, Naoyuki Matsumoto, Kenji Hiranuma, Iwane Mizuno e Akira Hasegawa. "Shock Absorbability of High-Abrasion-Resistance-Posterior Resin Teeth." Nihon Hotetsu Shika Gakkai Zasshi 44, n.º 5 (2000): 675–82. http://dx.doi.org/10.2186/jjps.44.675.

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Kvaal, Sigrid I., e T. K. Derry. "Tell-tale teeth: abrasion from the traditional clay pipe". Endeavour 20, n.º 1 (janeiro de 1996): 28–30. http://dx.doi.org/10.1016/0160-9327(96)10006-5.

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Bragaglia, Lauro Egídio, Luiz Henrique Maykot Prates e Maria Cristina Marino Calvo. "The role of surface treatments on the bond between acrylic denture base and teeth". Brazilian Dental Journal 20, n.º 2 (2009): 156–61. http://dx.doi.org/10.1590/s0103-64402009000200012.

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The aim of this study was to compare the bond strength between acrylic denture base and teeth subjected to 6 surface treatments. Ninety-six specimens were made with poly(methylmethacrylate) teeth bonded to a microwave-polymerized acrylic denture base material. The specimens were distributed into 6 groups (n=16) according to surface treatments: CT - no treatment (control); MN - methylmethacrylate monomer etching; AO - 50-µm-particle aluminum oxide air abrasion; BR - glaze removal with a round bur; ST - surface grinding with an aluminum oxide abrasive stone; group CV - cavity preparation (diatorics). The control and surface-treated groups were subjected to a compressive load at 45º angle to the long axis of the teeth. Data were analyzed by one-way ANOVA, followed by Scheffé's test (p<0.05). Bond strength means and (SD) in kgf for groups were: CT: 18.19 (7.14), MN: 18.34 (5.28), AO: 23.82 (5.40), BR: 23.30 (4.79), ST: 25.39 (7.80) and CV: 17.48 (7.17). There was statistically significant difference (p=0.037997) only between ST and CV. In conclusion, ridge lap surface grinding with an aluminum oxide abrasive stone provided the highest bond strength, though it differed significantly only when compared to diatorics. The other surface treatments provided similar bond between the acrylic denture base and teeth.

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Oreshko, L. S., e G. Ch Alieva. "Celiac disease: non-carious lesions of the teeth". Experimental and Clinical Gastroenterology, n.º 4 (21 de julho de 2021): 150–54. http://dx.doi.org/10.31146/1682-8658-ecg-188-4-150-154.

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The high prevalence of non-carious manifestations in patients with celiac disease is described by numerous authors, who are considered as a diagnostic key to atypical forms of celiac disease. The manifestations closely associated with celiac disease include: defects in tooth enamel, pathological tooth abrasion, as a violation of the mineralization of dental crowns, and morphofunctional defects in the hard tissues of the teeth.Materials and methods. We examined 45 patients aged 23 to 36 years with a diagnosis of celiac disease, established on the basis of the results of clinical anamnestic, genetic, instrumental studies, morphological study of a biopsy specimen of the intestinal mucosa.Result. Examination of the dentition of the patients showed that 100% of the examined had pathological abrasion of tooth enamel. Crowded teeth were found in 32 patients. Partial symmetric congenital adentia was diagnosed in 5 patients.Conclusion. The revealed dentoalveolar anomalies can be attributed to oral manifestations of celiac disease, which is a diagnostic criterion for suspected disease.

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Šporin, Jurij, Primož Mrvar, Blaž Janc e Željko Vukelić. "Expression of the Self-Sharpening Mechanism of a Roller Cone Bit during Wear Due to the Influence of the Erosion Protection Carbide Coating". Coatings 11, n.º 11 (28 de outubro de 2021): 1308. http://dx.doi.org/10.3390/coatings11111308.

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Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the roller cone drill bit depends on the wear rate of the materials that forms bit teeth, which crushes the rock at the bottom of the well. To prevent excessive wear, research has largely focused on the study and determination of abrasion-resistant materials. In our work, we investigated the wear mechanism of a roller cone drill bit whose wear-resistant teeth are protected by a hard metal coating welded onto the teeth. The difference between material properties of erosion-protective carbide coating and the tooth steel leads to uneven wear of bit teeth. In order to determine the material changes, we carried out detailed studies of the rock through which drilling was carried out, the drilling parameters and the materials of which the roller cone bit is made. The principle of wear of the tooth materials and their carbide coating, determined by our research, indicated the guidelines which could be basis for the development of abrasion-resistant materials could be carried out, as well as the problem of applying an erosion protection to the teeth of the studied type of roller cone bits.

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Sayed, Mohammed E., Honey Lunkad, Ibrahim Fageeh, Mahdi Jaafari, Ali Tawhari, Turki Muaidi, Mesfer Ibrahim Alshehri, Ankur Jethlia e Saurabh Jain. "Comparative Evaluation of Compressive Bond Strength between Acrylic Denture Base and Teeth with Various Combinations of Mechanical and Chemical Treatments". Coatings 11, n.º 12 (11 de dezembro de 2021): 1527. http://dx.doi.org/10.3390/coatings11121527.

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Debonding and detachment of artificial teeth from the denture base is frequently encountered in prosthodontic practice. This study aims to assess the effect of modifications in the ridge-lap surface of denture teeth with various combinations of mechanical and chemical surface treatments with hydrofluoric acid on bond strength with the acrylic denture base resin and to identify the failure modes (adhesive, cohesive, or mixed). Seventy acrylic resin teeth samples were randomly divided into seven groups (n = 10): a control group (unmodified) and six treatment groups, in which various combinations of mechanical and chemical surface treatments were performed. Then, these teeth were attached to a heat-cured denture base resin block at 45° angulation. The acrylized test samples were thermocycled, and the compressive bond strength was evaluated using a universal mechanical testing machine. The results suggest that roughening with diamond burs yields the highest bond strength, whereas etching/grooving and air abrasion result in the lowest bond strength. Acid etching complemented air abrasion to improve bond strength, while negative effects were noted with acid etching in other groups. Furthermore, roughening at the neck portion of the acrylic teeth can be used by the manufacturing companies as a standard to provide higher bond strength while maintaining the esthetics of the anterior teeth.

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RYNIEWICZ, Wojciech, Mariola HERMAN, Anna M. RYNIEWICZ, Łukasz BOJKO, Paweł PAŁKA, Andrzej RYNIEWICZ e Tomasz MADEJ. "TRIBOLOGICAL TESTS OF THE NANOMATERIALS USED TO RECONSTRUCT MOLARS AND PREMOLARS WITH THE APPLICATION OF THE DIRECT METHOD". Tribologia 273, n.º 3 (30 de junho de 2017): 155–64. http://dx.doi.org/10.5604/01.3001.0010.6253.

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Physiological abrasion of teeth is a process of gradual loss of the hard tissue of opposite teeth resulting from age-related natural dental wear. In abrasion, the cusps and their slopes in the jaw and the mandible become flattened due to the mechanical load applied. The aim of this paper is to carry out a tribological and microstructural evaluation of modern composite materials used to reconstruct the teeth in the lateral part of the dental arch. Five light-cured composite materials were selected for tests. The tests involved the coefficient of friction and resistance to wear in a sliding contact in the presence of artificial saliva and the microstructure of the external surface of samples before the wear process and in the wear-related damaged area. The test method applied, which combines a biomechanical analysis of resistance to wear and the analysis of the microstructure before the wear process and in the wear-related damaged area, makes it possible to evaluate the tribological properties of composite materials used to reconstruct teeth in the lateral part of the dental arch.

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Fischer, Valentin L., Daniela E. Winkler, Robert Głogowski, Thomas Attin, Jean-Michel Hatt, Marcus Clauss e Florian Wegehaupt. "Species-specific enamel differences in hardness and abrasion resistance between the permanent incisors of cattle (Bos primigenius taurus) and the ever-growing incisors of nutria (Myocastor coypus)". PLOS ONE 17, n.º 3 (17 de março de 2022): e0265237. http://dx.doi.org/10.1371/journal.pone.0265237.

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Hypselodont (ever-growing) teeth of lagomorphs or rodents have higher wear rates (of a magnitude of mm/week), with compensating growth rates, compared to the non-ever-growing teeth of ungulates (with a magnitude of mm/year). Whether this is due to a fundamental difference in enamel hardness has not been investigated so far. We prepared enamel samples (n = 120 per species) from incisors of cattle (Bos primigenius taurus) and nutria (Myocastor coypus, hypselodont incisors) taken at slaughterhouses, and submitted them to indentation hardness testing. Subsequently, samples were split into 4 groups per species (n = 24 per species and group) that were assessed for abrasion susceptibility by a standardized brush test with a control (no added abrasives) and three treatment groups (using fine silt at 4 ±1 μm particle size, volcanic ash at 96 ±9 μm, or fine sand at 166 ±15 μm as abrasives), in which enamel abrasion was quantified as height loss by before-and-after profilometry. The difference in enamel hardness between the species was highly significant, with nutria enamel achieving 78% of the hardness of cattle enamel. In the control and the fine sand group, no enamel height loss was evident, which was attributed to the in vitro system in the latter group, where the sand particles were brushed out of the test slurry by the brushes’ bristles. For fine silt and volcanic ash, nutria enamel significantly lost 3.65 and 3.52 times more height than cattle. These results suggest a relationship between enamel hardness and susceptibility to abrasion. However, neither the pattern within the species nor across the species indicated a monotonous relationship between hardness and height loss; rather, the difference was due to qualitative step related to species. Hence, additional factors not measured in this study must be responsible for the differences in the enamel’s susceptibility to abrasion. While the in vitro brush system cannot be used to rank abrasive test substances in terms of their abrasiveness, it can differentiate abrasion susceptibility in dental tissue of different animal species. The results caution against considering enamel wear as a similar process across mammals.

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Pan, Yong Tai, e Yong Zhi Li. "Experimental Study on Improving Abrasion Resistance of Sizing Crusher Tooth". Advanced Materials Research 150-151 (outubro de 2010): 1311–14. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1311.

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The shorter service life of sizing crusher tooth is a difficult technology problem. At present the coal classification used in crushing machine, due to poor working conditions, despite the use of wear resistant surfacing electrode to improve the wear resistance of broken teeth, broken teeth, but not to the average life of six months, the subject of study was significantly improve the life of the crusher tooth. To improve the service life of sizing crusher tooth, some research has been done, through system analysis and test some result can be concluded.

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Amarlal, Deepti, R. Rayen e M. Muthu. "Macroabrasion in Pediatric Dentistry". Journal of Clinical Pediatric Dentistry 31, n.º 1 (1 de setembro de 2007): 9–13. http://dx.doi.org/10.17796/jcpd.31.1.k106m4hu02318382.

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One of the most frequent reasons for seeking dental care is discolored anterior teeth. Macroabrasion is a technique used for the removal of localized superficial white spots and other surface stains. This article has compiled three case reports with relevant clinical photographs of discolored teeth where the treatment regimen included macroabrasion alone as well as macro-abrasion in combination with anterior composite restorations.

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Sengun, Abdulkadir, Hasan Orucoglu, Ilknur Ipekdal e Fusun Ozer. "Adhesion of Two Bonding Systems to Air-Abraded or Bur-Abraded Human Enamel Surfaces". European Journal of Dentistry 02, n.º 03 (julho de 2008): 167–75. http://dx.doi.org/10.1055/s-0039-1697374.

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ABSTRACTObjectives: The purpose of this in vitro study was to evaluate whether mechanical alteration of the enamel surfaces with air abrasion and bur abrasion techniques could enhance the bonding performance of a three step and a self etching adhesive resin systems to enamel.Methods: 126 extracted lower human incisor teeth were used. The teeth were divided into three groups including 40 teeth each. First group; teeth were used as control and no preparation was made on enamel surfaces, 2nd group; outer enamel surfaces were air abraded, 3rd group; outer enamel surfaces were abraded mechanically with a diamond fissure bur. Cylinder composite resin blocks were bonded to the buccal enamel surfaces with two bonding systems (20 specimens in each group). Bond strengths to enamel surfaces were measured at a cross-head speed of 1 mm/min. The data were analyzed by ANOVA and Duncan Tests. To examine interface composite resin/enamel surfaces at scanning electron microscopy, remaining 6 teeth were used. Fracture analysis was performed using an optical stereomicroscope.Results: Bond strengths values of Solid Bond were significantly higher than bond strengths of Clearfil SE Bond for all types of enamel (P<.05). Shear bond strength values obtained with Solid Bond (three step system) to three types of enamel surfaces [air-abraded (30.25±7.00 MPa), bur-abraded (29.07±3.53 MPa), control (31.74±7.35 MPa)] were close to each other (P>.05). The macroscopic mode of failures for bonding systems, SB and SE Bond appeared to be adhesive and cohesive in nature.Conclusions: In order to get better bond strength values with self etching systems, it is advisable to prepare enamel surfaces with bur or air abrasion, but it enamel preparation is not necessary for three step systems. (Eur J Dent 2008;2:167-175)

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Мандра, Ю., Y. Mandra, А. Легких, A. Legkih, Д. Киселева e D. Kiseleva. "Morfology, microstructure, microrelief, qualitative and quantitative composition of the teeth surface with early attrition". Actual problems in dentistry 12, n.º 2 (26 de julho de 2016): 30–35. http://dx.doi.org/10.18481/2077-7566-2016-12-2-30-35.

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Research by means of Raman spectrometry 30 teeth samples with pathological elements: early teeth attrition within the enamel, caries within the enamel, the intact enamel (control) was made. For caries average ratio of mineral/organic matrix is 0.31, and for fabrics with high abrasion – 0.64. With the development of caries decreased mineral content of the components (reduced phosphate line) and there are broad line of organic compounds, as well as increased uorescent background. All the investigated samples consist mainly of carbonate-apatite substituted by B-type, the maximum amount of which is characteristic of the intact enamel, minimum – for carious tissue; intermediate position occupied by the fabric with high abrasion. Carious tissue characterized highest content disordered phosphate – A-type substitution (carbonate ions replace hydroxyl ions) or presence of amorphous calcium phosphate. Comparison of qualitative and quantitative assessment of the composition of the mineral component of the pathology of hard tissues of teeth de nes a personalized approach to treatment and prevention of the progression of diseases of hard tissues of the teeth.

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Magera, N. S. "CLINICAL EVALUATION OF THE DENTOALVEOLAR SYSTEM IN EXCESSIVE TOOTH ABRASION AND TEMPOROMANDIBULAR DISORDERS". Ukrainian Dental Almanac, n.º 2 (19 de junho de 2019): 38–43. http://dx.doi.org/10.31718/2409-0255.2.2019.08.

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The purpose of the study was to determine the features of the state of the dentoalveolar system in patients with excessive abrasion of teeth with and without temporomandibular disorders (TMDs) in a comparative aspect. The study group included 68 patients, 31 (45.6%) of which were males and 37 (54.4%) females, aged from 21 to 70. Patients are divided into two groups: the control group and the study group. The control group included 31 patients who were diagnosed with excessive tooth abrasion alone in combination with possible other occlusal disorders. The study group included 37 patients with excessive abrasion of teeth, possible other occlusal disorders and various forms of temporomandibular disorders: muscular, articular, and combined. A preliminary clinical dental examination was based on instant diagnosis according to Hamburg protocol. Additional examination methods included clinical diagnostic techniques (to determine features of the mandibular movements, loading tests of the TMJ, palpation of masticatory muscles, muscles of the neck and shoulders, etc.), as well as imaging techniques of the TMJ (panoramic radiography, zonography, 3D radiography of the TMJ, MRI, ultrasound of the TMJ and muscles), as well as the condylography. The comparative analysis of prosthetic pathology, which was revealed in the oral cavity of patients depending on the groups, showed the following data. Excessive tooth abrasion without other occlusal pathologies was diagnosed only in 3 of 31 patients accounting for 9.7% in the group of patients with excessive tooth abrasion without signs of TMDs (control group). Among patients in this group, a fairly high percentage is attributed to the pathological eruption of the third molars – 32.1% and "multiple dental defects" – 21.5%, which together account for 53.6%. Excessive tooth abrasion alone without other occlusal disorders was diagnosed in 6 of 37 patients accounting for 16.2% in the group with both excessive tooth abrasion and temporomandibular disorders (study group). Prosthetic pathology was determined to occur three times more often among patients with both excessive tooth abrasion and TMDs compared to the patients with excessive tooth abrasion alone (38.7% in the group with TMDs vs. 14.3% in the control group, p<0.01). However, the pathological eruption of the third molars, on the contrary, was detected 2 times more often in the group with excessive tooth abrasion alone compared with the group of patients with TMDs (32.1% in the control group vs. 16.1% in the study group, p<0.05). A homogeneous distribution of the generalized type of tooth abrasion and its local type was found to be specific to the controls (51.6% with the generalized type and 49.4% with the local type of abrasion). However, for the local type of abrasion in this group of patients, it was determined that a significant predominance was specific to the frontal area in comparison with the distal regions of the tooth abrasion (the rates reached 41.9% for the frontal area vs. only 6.5% for the distal regions; p<0.01). A significant predominance of the local type of excessive abrasion (83.7% of the local type vs. 16.3% of the generalized type, p<0.001) was determined in patients with both excessive tooth abrasion and TMDs. Moreover, the distribution was almost homogeneous in relation to the frontal or distal regions (43.2% for frontal and 40.5% for distal areas). Probably, the loss of distal occlusal support in the area of the lateral teeth is a factor that can provoke the development of TMD. Such features should be taken into account when providing prosthetic care to such patients. The revealed features in the diagnosis of patients with excessive tooth abrasion, other occlusal disorders in the settings of temporomandibular disorders should be taken into account in their treatment and, especially, in the provision of prosthetics to such patients.

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Ctvrtlik, Radim, e Jan Tomastik. "Wear Behavior of Hard Dental Tissues and Restorative Materials". Applied Mechanics and Materials 486 (dezembro de 2013): 72–77. http://dx.doi.org/10.4028/www.scientific.net/amm.486.72.

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Human teeth are exposed to various chemical and mechanical factors. From mechanical point of view it includes attrition, abrasion or their combination. Teeth and dental restorative materials are subjected to normal and shear loads. Therefore the contact-based stresses during mastication and teeth wear are of considerable importance. In order to study wear behavior of enamel, dentine and two dental restorative composite materials scratch test at various contact conditions was employed. Hardness and elastic modulus were measured using nanoindentation with spherical and pyramidal indenters. Residual wear tracks were observed using laser scanning confocal microscopy.

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Eras, Juan Jose Cabello, Jorge Mario Mendoza Fandiño, Alexis Sagastume Gutierrez, Mario Javier Cabello Ulload e Luis Marcos Castellanos Gonzalez. "CAUSAL ANALYSIS AND SOLUTION OF THE FAILURE OF SPROCKET DRIVERS IN A CLINKER SCRAPER CONVEYOR". Journal of Southwest Jiaotong University 57, n.º 4 (29 de agosto de 2022): 326–37. http://dx.doi.org/10.35741/issn.0258-2724.57.4.29.

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This study discusses the causal analysis and solution of the teeth failure in sprocket drivers in a clinker scraper conveyor of a cement plant. The failure consisted of the progressive surfacing shape loss of the teeth, progressively deteriorated to the operating conditions of the system, causing dynamic loads, which affected the mechanical transmission and the conveyor general performance. The assessment includes an analysis of the sprocket material and calculations of the stress fields in the teeth surface. The results show the failure is the result of using a sprocket material with high-abrasive resistance, but with yield strength lower than required for operating conditions. This failure can be addressed by replacing the entire sprocket that results in significant downtime and economic losses. The main contribution of this study is developing a solution based on the local quality principle to repair and prevent the failure without removing the sprocket. Furthermore, the analysis considers the surface forces resulting from the high friction coefficient caused by the lack of lubrication, resulting in stress values higher than the fluence limit of the teeth material. Therefore, the solution proposed is manufacturing the teeth with a different material with higher strength and abrasion resistance to prevent failures by deformation. The proposed solution takes advantage of the damaged sprocket wheels available in the plant. The teeth manufactured are welded in a plate that is later bolted to the sprocket wheel, which was previously machined to remove the damaged teeth and prepare the surface to assemble the new teeth.

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Fumes, Ana Caroline, Daniele Lucca Longo, Andiara De Rossi, Tatiana Kelly da Silva Fidalgo, Francisco Wanderley Garcia de Paula e Silva, Maria Cristina Borsatto e Erika Calvano Küchler. "Microleakage of Sealants after Phosphoric Acid, Er: YAG Laser and Air Abrasion Enamel Conditioning: Systematic Review and Meta-Analysis". Journal of Clinical Pediatric Dentistry 41, n.º 3 (1 de janeiro de 2017): 167–72. http://dx.doi.org/10.17796/1053-4628-41.3.167.

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Purpose: The aim of this systematic review and meta-analysis is to answer the focused question: Does the application of phosphoric acid, Er:YAG laser and air abrasion enamel conditioning methods previous to the oclusal sealant application in human permanent molars influence the microleakage? Study design: A literature research was carried out in the Pubmed Medline, Web of Science, Scopus and Cochrane databases using with the MeSH terms and keyword search strategy. A supplemental hand search of the references of retrieved articles was also performed. Inclusion criteria comprised ex vivo studies (extracted teeth) with permanent human teeth that used chemical (phosphoric acid) or mechanical (Er:YAG laser and air abrasion) conditioning methods previous the sealant application. The studies should evaluate microleakage as an outcome. Meta-analysis pooled plot were obtained comparing the microleakage after pre-treatment with phosphoric acid, Er:YAG and air abrasion enamel conditioning for sealant application using RevMan software. Results: The search resulted in 164 articles, 55 records were excluded because they were duplicated. The analysis of titles and abstracts resulted in the exclusion of 105 studies. Four studies were included in the systematic review and the meta-analysis. According to the risk of bias evaluation, the four studies were considered low risk of bias. The meta-analysis showed that phosphoric acid had lower microleakage than Er:YAG laser (p < 0.001) and air abrasion (p < 0.001), with heterogeinity of I2 = 0% and I2 = 71%, respectively. It was not found statistical difference when compared phosphoric acid and phosphoric acid combined with Er:YAG laser and air abrasion (p > 0.05). Conclusion: The evidence supports that the pretreatment with phosphoric acid leads lower microleakage in oclusal sealants than Er:YAG laser and air abrasion.

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Duruk, Gülsüm, Esra Kizilci e Meral Arslan Malkoç. "Effectiveness of Different Methods in Removing Dentin Caries of Primary Teeth: Micro-CT and SEM Evaluation". Journal of Clinical Pediatric Dentistry 46, n.º 3 (1 de maio de 2022): 211–18. http://dx.doi.org/10.17796/1053-4625-46.3.7.

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Objectives: With the recent improvements in technology, the expectation of minimal invasion and maximal comfort in caries removal techniques is increasing. This study aims to examine the effectiveness of six caries removal methods in primary teeth. Study design: Sixty primary molars (10 teeth in each groups) were used. The groups were: Group I (Tungsten Carbide Bur), Group II (Sono abrasion), Group III (Air abrasion), Group IV (Carisolv), Group V (Er:YAG Laser), Group VI (ART). In micro-CT scanning, mineral density at the cavity floor was examined before and after caries removal. After caries removal, the patency of the dentinal tubules was examined in two teeth from each group on SEM images. Statistical analyses were performed using Kruskal-Wallis, Wilcoxon tests. Results: For six different caries removal methods, tooth mineral (inorganic, total) densities at cavity floors were compared among the groups after the procedures, and no statistically significant difference was found (p>0.05). On the SEM images, it was seen that the dentinal tubules were exposed and no smear layer was formed in the Carisolv group. Significant rough surfaces were exposed in the laser group. Conclusion: It was observed that alternative caries removal methods are at least as effective as the traditional method in primary teeth for clinical applications.

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Lima Pedro, Rafael De, Livia Azeredo Alves Antunes, Áurea Simone Barrôso Vieira e Lucianne Comple Maia. "Analysis of Primary and Permanent Molars Prepared with High Speed and Ultrasonic Abrasion Systems". Journal of Clinical Pediatric Dentistry 32, n.º 1 (1 de setembro de 2007): 49–52. http://dx.doi.org/10.17796/jcpd.32.1.a57600rm6vrx3174.

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The aim of this study was to compare high speed and ultrasonic systems with regard to both topography and smear layer formation in the cavity preparations of sound primary and permanent molars. Class I occlusal cavities measuring 2.00 x 2.00 x 2.00 mm were performed in 14 molars, equally divided into two groups (GI= 7 primary teeth and GII = 7 permanent teeth). High speed rotary instruments produced regular layers of enamel and dentin, despite the marked presence of grooves and microfractures on enamel surfaces. On the other hand, ultrasonic abrasion yielded more irregular surfaces in enamel and dentin, with a granular and wavy aspect, but without microfractures in enamel. Both types of dental substrates were found to have an intense smear layer formation, partially or even completely obliterating the dentinal tubules (p>0.05), irrespective of the instrument used. No difference was observed in either primary or permanent teeth as regards the amount of smear layer produced by high speed or ultrasonic abrasion instruments (p>0.05). It was concluded that with regard to the topography of cavity preparations, there were differences between the instruments used, irrespective of the dental substrate. Both systems allowed dense smear layer formation, which completely or partially obliterated the dentinal tubules of primary and permanent teeth.

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Mitic, Nadica, Aleksandar Mitic, Vladimir Mitic, Vesna Crnoglavac, Dejana Vlak e Marija Nikolic. "Tooth pathology analysis of osteological material from the medieval locality of Saint Pantelejmon church in Nis". Srpski arhiv za celokupno lekarstvo 136, n.º 7-8 (2008): 354–60. http://dx.doi.org/10.2298/sarh0808354m.

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INTRODUCTION Medieval necropolis at the porch of St. Panteleimon church in Nis, from 12th century represents a typical Serbian necropolis, which has its analogies in several areas in Serbia. Preservation of the skeletal remains belongs to category of good and medium preservation. OBJECTIVE The aim of the work was to study the skeletal remains for the prevalence of tooth caries, localization of caries lesions, presence of abrasion, supragingival tartar and resorption of alveolar bone as the indicator of periodontal disease. METHOD The analyses included 42 skeletal remains. The anthropological analyses involved paleopathological findings on 954 teeth of 22 men and 20 women. The pathological changes of teeth were determined by inspection, dental probe, dental mirror and x-ray examination. Epidemiological research was done using average caries index. RESULTS The antropological tooth pathology research of osteological material from the medieval localization of St. Pantaleimon Church in Nis showed the presence of caries in 7.86% cases, 9.93% women and 6.07% men. In 76% caries were localized on the approximal surfaces of teeth. Abrasion of the second and third degree was registered on the side and front teeth with transformation of contact points into contact surfaces and the creation of approximal, interstitial, scolded surfaces. A large quantity of supragingival tartar was found in all individuals aged over 25 years. Expressed alveolar bone resorption is the indicator of generalized periodontal disease. CONCLUSION The prevalence of caries in the studied medieval population from the 12th century was sporadic, with localization on secondary predilection places. The abrasion of the second and third degree was present, and the resorption of the alveolar bone was registered in all the examined skeletal remains, which was the indicator of spread periodontal disease in this period.

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Messer-Hannemann, Philipp, Mariam Samadi, Henrik Böttcher, Sebastian Duy, Daniela Duy, Niclas Albrecht, Falk Schwendicke e Susanne Effenberger. "Evaluation of a Method to Determine Wear Resistance of Class I Tooth Restorations during Cyclic Loading". Materials 15, n.º 15 (8 de agosto de 2022): 5440. http://dx.doi.org/10.3390/ma15155440.

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The aim of this study was the development of a test regime to determine the wear resistance and predict the clinical performance of conventional glass ionomer cement (GIC) restorations in Class I tooth cavities. Cavities were prepared in excised human teeth and restored using three conventional glass ionomer restorative materials: DeltaFil, Fuji IX GP and Ketac Universal. The restored teeth were mechanically and thermally stressed using a chewing simulator with a maximum number of 1,200,000 load cycles. Besides determining the number of cycles achieved, the abrasion volume after termination of the chewing simulation was calculated using µCT images. All teeth restored with DeltaFil reached 1,200,000 cycles without any restoration failure. Only 37.5% of the restorations each with Ketac Universal and Fuji IX GP were able to achieve the maximum cycle number. A significant lower abrasion volume for restorations with DeltaFil compared to Ketac Universal (p = 0.0099) and Fuji IX GP (p = 0.0005) was found. Laboratory chewing simulations are a useful tool to study basic wear mechanisms in a controlled setting with in-vivo related parameters. DeltaFil shows an improved wear resistance compared to other conventional GICs, indicating the high potential of this material for long-lasting Class I restorations.

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Tuszyński, Waldemar, Remigiusz Michalczewski, Edyta Osuch-Słomka, Andrzej Snarski-Adamski, Marek Kalbarczyk, Andrzej N. Wieczorek e Jakub Nędza. "Abrasive Wear, Scuffing and Rolling Contact Fatigue of DLC-Coated 18CrNiMo7-6 Steel Lubricated by a Pure and Contaminated Gear Oil". Materials 14, n.º 22 (22 de novembro de 2021): 7086. http://dx.doi.org/10.3390/ma14227086.

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Due to extreme working conditions of mining conveyors, which contaminate gear oil with solid particles, their transmissions are exposed to intensive abrasion, scuffing, and even rolling contact fatigue (pitting). These effects shorten gear life. To prevent their occurrence, a wear-resistant coating can be deposited on gear teeth. The resistance to abrasive wear, scuffing, and pitting was investigated and reported in the article. Simple, model specimens were used. Abrasive wear and scuffing were tested using a pin-and-vee-block tribosystem in sliding contact. A cone–three-ball rolling tribosystem was employed to test pitting. The material of the test specimens (pins, vee blocks, cones) was 18CrNiMo7-6 case-hardened steel. Two types of DLC (Diamond-like Coatings) coatings were tested, W-DLC and W-DLC/CrN. The vee blocks and cones were coated. Two industrial gear oils were selected to lubricate the specimens: one with a mineral and one with a synthetic PAO (polyalphaolephine) base, as pure oil or contaminated with solid particles from a coal mine. The results show that, to minimize the tendency to abrasion, scuffing, and pitting of specimens made of 18CrNiMo7-6 steel, the W-DLC/CrN coating should be deposited. This coating also gives very good protection when the lubricating oil is contaminated.

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Deshpande, Neeraj, Naveen S. Yadav, Vrinda Saxena, Raghavendra Reddy e Suresh Kumar Kovvuru. "Alliance of Oral Hygiene Practices and Abrasion among Urban and Rural Residents of Central India". Journal of Contemporary Dental Practice 13, n.º 1 (2012): 55–60. http://dx.doi.org/10.5005/jp-journals-10024-1095.

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ABSTRACT Objectives To attain alliance between the oral hygiene practices with prevalence of tooth abrasion among urban and rural adult population of Central India. To plan dental care services in inaccessible areas and to suggest appropriate remedial measures to prevent this avertable and self-inflicted injury of teeth in this cross-sectional study. Materials and methods A sum of 1045 adult residents both from Urban (529) and rural (516) parts of Bhopal district (Central India) was selected on a random basis. The multistage sampling technique was adopted to ascertain the sample size. In urban area the study population consisted of 240 males, 289 females and 201 males and 315 females in rural area respectively. All residents above 18 years of age from the Bhopal district were included in cross-sectional study. Assessment form comprises of questionnaire and general information on oral hygiene practices, dietary habits and medical history. Abrasion was assessed using diagnostic criteria recommended by Smith and Knight (modified). Chi- square test was used to test associations between categorical variables at 5% level of significance. Regression analysis attempted to define for risk factors causing abrasion. Literature on the prevalence of abrasion is very sparse, so attempt is made to correlate the etiological factors and recommend to prevent tooth wear. Results Investigation of this cross-sectional study was aggregate of 1045 residences. Result shows high prevalence of abrasion 70.2%. Higher prevalence concomitant with diffident habits related to oral hygiene maintenance was recorded more among rural (76.9%) when compared to urban dwellers (63.7%). Presence of abrasion verifies statistical significance in relation to age, ruralurban difference and variations in habit of oral hygiene care. Stated in the present study, avertable and self-inflicted is toothabrasion, recurrently resulted by the reprehensible brushing method and common use of indigenous material for the maintenance of oral hygiene. Conclusion Shows significant liaisons with the presence of abrasions in relation to Urban and rural dwelling, age, material used and mode of brushing and duration of brushing. Indigenous and course material causes high amount of enamel wear and with the advancement in age abrasion tend to increase. Prevalence of abrasion does not show any gender predilection. Cultural believes, lifestyle and transition reflects in deviating presence of abrasion in populations. How to cite this article Yadav NS, Saxena V, Reddy R, Deshpande N, Deshpande A, Kovvuru SK. Alliance of Oral Hygiene Practices and Abrasion Among Urban and Rural Residents of Central India. J Contemp Dent Pract 2012;13(1): 55-60.

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Borjian, Amirfirooz, Claudia C. F. Ferrari, Antoni Anouf e Louis Z. G. Touyz. "Pop-Cola Acids and Tooth Erosion: AnIn Vitro,In Vivo, Electron-Microscopic, and Clinical Report". International Journal of Dentistry 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/957842.

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Introduction. Manufactured Colas are consumed universally as soft drinks. Evidence about the acid contents of Cola-beverages and its effects on teeth is rare.Aim. To assess (i) cola acidity and buffering capacityin vitro, (ii) tooth erosion after swishing with colasin vivo(iii) scanning electronmicroscopic effectson teeth of colas, and tooth-brush abrasion, and (iv) report aclinical caseof erosion from cola consumption.Materials and Methods. (i) We measured six commercially available pop “Cola beverages”, pH, and buffering capacities using a pH-Mettler Automatic Titrator, with weak solution of Sodium Hydroxide (ii) two cohorts, onewith teeth, the secondwithout teethrinsed with aliquots of Cola for 60 seconds. Swished cola samples tested for calcium and phosphorus contents using standardized chemical analytical methods (iii) enamel, dentine, and the enamel-cemental junction from unerupted extracted wisdom teeth were examined with a scanning electron microscope after exposure to colas, and tested for tooth-brush abrasion; (iv) a clinical case of pop cola erosion presentation, are all described.Results. Comparisons among pop colas testedin vitroreveal high acidity with very low pH. Buffering capacities in millilitres of 0.5 M NaOH needed to increase one pH unit, to pH 5.5 and pH 7 are reported. Rinsingin vivowith pop cola causes leeching of calcium from teeth; SEM shows dental erosion, and pop-cola consumption induces advanced dental erosion and facilitates abrasion.Conclusions. (i) Pop-Cola acid activity is below the critical pH 5.5 for tooth dissolution, with high buffering capacities countering neutralization effects of saliva; (ii) calcium is leeched out of teeth after rinsing with pop colas; (iii) SEM evidence explains why chronic exposure to acid pop colas causes dental frangibles; (iv) aclinical caseof pop-cola erosion confirms this.

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Аль-Cаггаф, Сами Абдулрахман Хусейн, Sami Abdulrahman Hussein Al-Caggaf, Ф. Маннанова, F. Mannanova, Г. Алсынбаев, G. Alsynbaev, М. Галиуллина et al. "ORTHODONTIC PREPARATION BEFORE PROSTHESIS IN GENERALIZED HIGH TEETH ABRASION DECOMPENSATED FORM". Actual problems in dentistry 9, n.º 4 (25 de agosto de 2013): 42–47. http://dx.doi.org/10.18481/2077-7566-2013-0-4-42-47.

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Generalized increased abrasion decompensated forms are often accompanied by severe morphofunctional impairments that require careful diagnosis and preparation of dental system before its final restoration. The authors suggest anthropometric observations for diagnostic aims to clarify the the mandible position, also machines for the normalization of the position of the lower jaw, and adaptation of the masticatory muscles with orthodontic techniques in the stage of preparation for prosthetics.

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Erasmuson, A. F. "Abrasion of ovine teeth from high-wear and low-wear farms". New Zealand Journal of Agricultural Research 28, n.º 2 (abril de 1985): 225–31. http://dx.doi.org/10.1080/00288233.1985.10420932.

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Nixon, Peter J., Stephen Robinson, Matthew Gahan e Martin FW-Y. Chan. "Conservative Aesthetic Techniques for Discoloured Teeth: 2. Micro-abrasion and Composite". Dental Update 34, n.º 3 (2 de abril de 2007): 160–66. http://dx.doi.org/10.12968/denu.2007.34.3.160.

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