Littérature scientifique sur le sujet « Teeth Abrasion »
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Articles de revues sur le sujet "Teeth Abrasion"
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Jakarta1, Ngatemi poltekkes, et 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, no 2 (29 février 2020) : 185–90. http://dx.doi.org/10.22236/arkesmas.v4i2.3746.
Texte intégralRésumé :
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 et Junyoung Park. « Simulation of Non-Carious Cervical Lesions by Computational Toothbrush Model : A Novel Three-Dimensional Discrete Element Method ». Sensors 22, no 11 (31 mai 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 et 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, no 01 (28 mars 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, et 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, no 4 (août 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 et M. N. Puzdyreva. « Comparative characteristics of masticatory muscle tone in patients with compensated and decompensated increased teeth abrasion ». Periodontology 24, no 2 (29 avril 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, et Marija Đurić-Srejić. « Abrasion of Teeth in Population Groups from Historical Periods in the Region of Former Yugoslavia ». Dental Anthropology Journal 11, no 1 (7 septembre 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 et A. S. Manvelyan. « Evaluation of the Roughness of the Enamel Surface According to Profilometry Data (Pilot Study) ». Medical alphabet, no 34 (13 janvier 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 et 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, no 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, no 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 et Li Jun Guo. « The Failure Mechanism of Bucket Teeth of Electric Excavator Used in Metal Mine ». Advanced Materials Research 580 (octobre 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.
Thèses sur le sujet "Teeth Abrasion"
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Chan, Kit-ping Cordelia, et 陳潔萍. « Comparing the effectiveness of a new innovative desensitizing paste to a home-used desensitizing toothpaste in reducing dentine hypersensitivity among Chinese adults ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206444.
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This study aimed to compare the effectiveness of an 8% arginine and calcium carbonate in-office desensitizing prophylaxis paste with that of a home-use toothpaste having the same active ingredients in reducing dentine hypersensitivity. The study was a randomized controlled clinical trial involving 55 subjects who had at least one tooth with sound exposed dentine on the cervical region of the buccal surface displaying hypersensitivity. The subjects were recruited from students and staff, other than those from the Faculty of Dentistry, of The University of Hong Kong. After receiving scaling performed by a dental hygienist at baseline, subjects were randomly assigned to either the in-office desensitizing prophylaxis paste treatment group or the home-use desensitizing toothpaste group. Clinical assessments of dentine hypersensitivity to tactile and to thermal stimuli were performed prior to the treatment at baseline, week 4 and week 12 by a blinded examiner and subjective global assessments of dentine hypersensitivity were recorded. The responses of the subjects to both stimuli were recorded by using a pain score scale from 0 to 10 (from no pain to unbearable pain). Reponses to both tactile and thermal hypersensitivity assessments in the home-use desensitizing toothpaste group showed statistically significant differences between baseline and week 12 (tactile: 2.4 vs. 0.9; cold: 5.8 vs. 3.5, both p<0.05). There was a statistically significant difference in the tactile assessment scores (1.8 vs. 1.0, p<0.05) but not in the thermal hypersensitivity assessment scores (5.5 vs. 5.3, p>0.05) for the in-office desensitizing prophylaxis paste group. There was also a statistically significant difference in the change in thermal assessment scores between the two groups (in-office: -0.2 vs. home-use: -2.3, p<0.05) but not in the tactile hypersensitivity assessment scores (in-office: -0.9 vs. home-use: -1.2, p>0.05). There were no statistically significant differences in global subjective responses to external stimuli in the telephone interviews. Daily use of an 8% arginine and calcium carbonate toothpaste was able to reduce dentine hypersensitivity over 12 weeks but a single in-office application of prophylaxis paste of similar content was not able to provide instant and long-lasting benefits for subjects with a mild-to-moderate degree of dentine hypersensitivity.published_or_final_version
Dentistry
Master
Master of Philosophy
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Wong, Tak-ying Anita, et 黃德瑩. « Oral health status and quality of life of children and adolescents with severe hypodontia ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31954339.
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Muzilli, Marcelo 1972. « Efeito de metodos de polimento na rugosidade e dureza Vickers de ceramicas para cobertura ». [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289567.
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Orientador: Lourenço Correr SobrinhoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-13T01:39:57Z (GMT). No. of bitstreams: 1 Muzilli_Marcelo_D.pdf: 34149055 bytes, checksum: 91212ba7ea6406d835e270899c5d9256 (MD5) Previous issue date: 2009
Resumo: O objetivo deste estudo foi avaliar o efeito do método de polimento na rugosidade e na dureza Vickers de doze cerâmicas utilizadas para cobertura, após serem submetidas ao desgaste abrasivo. Foram confeccionados quarenta discos de cada cerâmica, cor de esmalte, com 8 mm de diâmetro e 2 mm de espessura. O pó cerâmico de cada marca comercial (CERAMCO, CERCON, FINESSE, IPS D.SIGN, IPS ERIS, VINTAGE HALO, VISION, VISION ESTHETIC, VITA VM7, VITA VM9, VITA VM13 e WILL CERAM) foi aglutinado com o líquido modelador indicado e aplicado em uma matriz metálica bipartida. Após a sinterização e o esfriamento, os discos foram desgastados, simulando uma situação de ajuste oclusal, com ponta diamantada 3098 F e 3098 FF (KG Sorensen), e divididos em 4 grupos (n=10): Grupo P - polimento com abrasivos do sistema Shofu; Grupo PP - polimento com sistema Shofu + pasta diamantada (6 mm - KG SORENSEN); Grupo PG - polimento + glaze e Grupo G - glaze (Controle). Os corpos-de-prova foram levados ao rugosímetro Surf-Corder para mensuração da rugosidade de superfície, utilizando o parâmetro Ra. Foram feitas três mensurações em cada corpo-de-prova. A dureza Vickers foi efetuada no aparelho HMV-2 (Shimadzu), calibrado com carga de 9,8 N atuando por 15 segundos. Cinco penetrações foram feitas em cada corpo-de-prova e a média calculada. Os dados foram submetidos à Análise de Variância e ao teste de Tukey (5%) e mostraram que as cerâmicas Finesse, VM7, VM9, VM13 e IPS Eris não tiveram influência do método de polimento na dureza Vickers. Os menores valores de dureza Vickers foram obtidos pelas cerâmicas Vintage Halo e VM7 no grupo P; Cercon, Vintage Halo, VM9 e Ceramco no grupo PP; Cercon no grupo PG e Ceramco, Cercon, Will Ceram e Vision Esthethic no grupo G. Os métodos de polimento tiveram influência na rugosidade em todas as cerâmicas utilizadas. Os menores valores de rugosidade foram obtidas pelas cerâmicas VM9, VM13, VM7, IPS Eris, Ceramco e Vintage Halo, no grupo P; Will Ceram, VM7, VM13 e Vintage no grupo G e Will Ceram, VM7 e Vision no grupo PG. O grupo PP promoveu os menores valores de rugosidade não diferindo entre as cerâmicas utilizadas.
Abstract: The aim of this study was to evaluate the polish method influence on surface roughness and Vickers hardness number of the twelve dental ceramics, after abrasive grinding. Forty enamel ceramic disks with 8 mm in diameter and 2.0mm thickness were made. The ceramic powder for each brand (CERAMCO, CERCON, FINESSE, IPS D.SIGN, IPS ERIS, VINTAGE HALO, VISION, VISION ESTHETIC, VITA VM7, VITA VM9, VITA VM13 and WILL CERAM) was agglutinated with the appropriate modeling liquid and applied on a bipartite metallic matrix. After the sinterization and cooling, the disks were submitted to a simulation of oclusal adjustment with 3098 F and 3098 FF diamonds burs (KG SORENSEN), and divided into four groups (n=10): Group P - Shofu polishing system; Group PP - Shofu polishing system + diamond paste (6mm - KG SORENSEN); Group PG - Shofu polishing system + glaze; and, Group G - glaze (control). The roughness was measured on a Surf-Corder machine using Ra parameter. Three measurements were made for each specimen and the average calculated. The Vickers hardness number was measured with HMV 2 microhardness tester (Shimadzu), with a load of 9,8 N applied for 15 seconds. Five measurements were made for each specimen. The dates were submitted to ANOVA and Tukey's test (5%) and showed that only the ceramics FINESSE, VM7, VM9, VM13 and IPS ERIS weren't the influence of surface treatment on Vickers hardness. The lowers hardness values were obtained by Cercon, Vintage Halo and VM7, in group P; Cercon, Vintage Halo, VM9 and Ceramco in Group PP; Cercon, in Group PG; Ceramco, Cercon, Will Ceram and Vision Esthetic, in Group G. The roughness suffered the influence of the surface treatment in all the ceramics that were used. The lowers roughness values were obtained by VM9, VM13, VM7, IPS Eris, Ceramco and Vintage Halo, in Group P; Will Ceram, VM7, VM13 e Vintage in Group G and Will Ceram, VM7 e Vision in Group PG. The Group PP promoted the lowers roughness averages that didn't show any difference statistic among all the ceramics.
Doutorado
Materiais Dentarios
Doutor em Materiais Dentários
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Logan, Murray. « Nutritional stresses and the feeding behaviour and activity patterns of free-ranging koalas (Phascolarctos cinereus : Goldfuss) ». Monash University, School of Biological Sciences, 2003. http://arrow.monash.edu.au/hdl/1959.1/9593.
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Taylor, R. M. S. (Richard Morris Stovin), et n/a. « Anatomy and biology of tooth dislocation and wear in the pre-European Maori and Australian Aborigine : with supporting publications ». University of Otago. School of Dentistry, 1991. http://adt.otago.ac.nz./public/adt-NZDU20070627.105619.
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Summary: Some 250 Australian aboriginal skulls were studied to ascertain differences in tooth dislocation and wear in this ethnic group as compared with those manifested in the pre-European Maori, with consideration of the differences in cultural and botanical background as contributing factors. Other features were studied, including the crowding of anterior teeth, the incidence of caries and abscesses, and of mottled enamel and tooth fracture.
Aspects of physical anthropology and biology were found to be relevant to this study, since they offered explanations for some previously unsolved problems such as edge-to-edge bite, and crowding of incisors in well-formed jaws.
The work is supported by 28 illustrations of the dentition selected from various sources, and described in the text.
Reprints of 18 other published papers reporting various dental studies of relevance to the above major publication are included in this presentation.
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Shabanian-Borojeni, Mitra. « Wear studies of enamel and some restorative materials ». Title page, contents and summary only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phs5241.pdf.
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Includes bibliographical references (leaves [1-20]). A systematic analysis of wear involving the in vitro analysis of the wear of standard composite resin and glass ionomer cements restorations under controlled conditions; and, the qualitative and quantitative investigation of wear over a range of pH's and loads which might be encountered clinically in order to develop a "wear map" of the micromorphology of wearing teeth and restorations and a systematic modeling of wear rates.
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Viana, Ítallo Emídio Lira. « Efeito dos desafios erosivo ou erosivo/abrasivo sobre as estruturas dentárias adjacentes às restaurações realizadas com materiais contendo fluoreto ou cálcio ». Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-04042018-110822/.
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Esse estudo avaliou in vitro o efeito dos desafios erosivo ou erosivo/abrasivo sobre materiais restauradores contendo fluoreto ou cálcio e sobre as estruturas dentárias adjacentes às restaurações realizadas com esses materiais. Fragmentos de esmalte e de dentina bovinos (4 mm × 4 mm × 2 mm), foram incluídos em resina acrílica e planificados. Uma cavidade padrão com dimensões 1,2 mm × 4 mm × 1,5 mm foi preparada nos espécimes, e restaurada de acordo com o material a ser testado: 1. Z350 - resina composta (Filtek Z350, 3M ESPE); 2. VB - compósito experimental contendo apenas vidros de bário; 3. DCPD30% - compósito experimental contendo 10% de vidros de bário e 30% partículas de fosfato di-cálcio di-hidratado (DCPD) funcionalizadas com dimetacrilato de dietilenoglicol (DEGDMA); 4. DCPD60% - compósito experimental contendo 60% partículas de DCPD funcionalizadas com DEGDMA; 5. Beautifil - GIOMER (Beautifil II, Shofu Dental Corporation); 6. Fuji IX - cimento de ionômero de vidro convencional de alta viscosidade (Fuji IX, GC Corporation); 7. Fuji II LC - cimento de ionômero de vidro modificado por resina (Fuji II LC, GC Corporation). Na sequência, os espécimes foram polidos e submetidos a dois tipos de tratamentos: erosão somente (n=10) ou erosão mais abrasão por escovação (n=10). A erosão foi realizada pela imersão dos espécimes em ácido cítrico a 0,3% (pH~2,6) por 5 min, seguido de 60 min de imersão em saliva artificial. Esse procedimento foi repetido 4×/dia, por 5 dias. A escovação foi realizada com uma suspensão de dentifrício padrão (Colgate Total 12 Mint Clean; 1450 ppm F-, como NaF) por 15 s (2 min de exposição total a suspensão de dentifrício), 2×/dia, 30 min após o primeiro e o quarto desafios erosivos. Ao final da ciclagem, a perda superficial (em ?m) do esmalte, da dentina e dos materiais restauradores foi determinada com um perfilômetro ótico. Para cada modelo (erosão e erosão-abrasão), os dados de perda superficial de esmalte, dentina e restauração foram analisados de maneira independente. Os dados foram analisados pelos testes de Kruskal-Wallis e Tukey. O nível de significância utilizado foi de 5%. No modelo de erosão, para esmalte, ambos cimentos ionoméricos apresentaram menor perda superficial do que o compósito Z350, apesar de Fuji II LC não ter se diferenciado significativamente dos grupos Beautifil e DCPD30%. Os outros grupos não foram diferentes de Z350 nem entre si. Para dentina, nenhum dos grupos foi diferente de Z350, com exceção de DCPD60%, o qual apresentou a maior perda superficial. Ambos cimentos ionoméricos apresentaram menor perda do que DCPD30%, Beautifil e DCPD60%. Em relação à restauração, os materiais Z350, Beautifil, VB, DCPD30% apresentaram perda superficial mínima, sem diferenças entre eles. Os cimentos ionoméricos apresentaram os maiores valores de perda, não se diferenciando de DCPD60%. No modelo erosão-abrasão, para esmalte, a menor perda superficial foi observada em Fuji II LC, sem diferença da Beautifil. Os outros grupos não se diferenciaram entre si nem da Beautifil. Para dentina, os grupos DCPD60%, Beautifil, Fuji II LC, Z350 e Fuji IX não se diferenciaram e, apresentaram menor perda superficial do que VB. Os cinco grupos citados também não foram diferentes de DCPD30%, com exceção de Fuji IX. Em relação à restauração, a maior perda foi observada para Fuji IX, sem diferenças de Fuji II LC e Beautifil. DCPD30%, Z350, VB e DCPD60% apresentaram valores mínimos de perda superficial, sem diferenças entre si. Concluiu-se que o cimento ionomérico Fuji II LC foi único capaz de proteger o esmalte adjacente à restauração contra desafios erosivos e erosivos/abrasivos, apesar de ter sido um dos materiais mais susceptíveis ao desgaste por ambos desafios. Para dentina, nenhum material exibiu efeito protetor.This in vitro study evaluated the effect of erosive or erosive/abrasive challenges on restorative materials containing fluoride and calcium, and on the dental hard tissues adjacent to restorations performed with these materials. Enamel and dentin specimens (4 mm × 4 mm × 2 mm), obtained from bovine incisors, were embedded in acrylic resin, flattened and polished. In the specimens, a standard cavity of 1,2 mm × 4 mm × 1,5 mm was prepared and restored with the following materials: 1. Z350 - Composite resin without actives, Filtek Z350 (3MESPE); 2. VB - experimental composite containing barium glass only; 3. DCPD30% - experimental composite containing 10% of barium glass and 30% of DCPD particles functionalized with DEGDMA; 4. DCPD60% - experimental composite containing 60% of DCPD particles functionalized with DEGDMA; 5. Beautifil - GIOMER (Beautifil II, Shofu Dental Corporation); 6. Fuji IX - high viscosity glass ionomer (Fuji IX, GC Corporation); 7. Fuji II LC - resin-modified glass ionomer (Fuji II LC, GC Corporation). The specimens were polished again and then submitted to one of the two treatments: erosion only (n=10) or erosion plus toothbrushing abrasion (n=10). Erosion was performed by immersing the specimens in 0.3% citric acid solution (p~2.6), for 5 min, followed by 60 min exposure to artificial saliva. This procedure was repeated 4 times a day, for 5 days. Toothbrushing was performed with a slurry of a standard dentifrice (Colgate Total 12 Mint Clean; 1450 ppm F, as NaF), for 15 s (2 min total exposure time to the slurry), 2 times a day, 30 min after the first and last erosive challenges. At the end of cycling, enamel, dentin and restorative material surface loss (in ?m) were determined by optical profilometry. Data were analyzed by the Kruskal-Wallis and Tukey tests. The level of significance was 5%. In the erosion model, for enamel, both ionomeric cements presented lower surface loss than the Z350, although Fuji II LC did not differ significantly from Beautifil and DCPD30% groups. The other groups were no different from Z350 and from each other. For dentin, none of the groups were different from Z350, except for DCPD60%, which presented the highest surface loss. Both ionomeric cements presented lower loss than DCPD30%, Beautifil and DCPD60%. Regarding the restoration, the materials Z350, Beautifil, VB, DCPD30% showed minimal surface loss, with no differences between them. The ionomeric cements had the highest loss values, not differing from DCPD60%. In the erosion-abrasion model, for enamel, the lowest loss was observed for Fuji II LC, with no difference to Beautifil. The other groups showed no difference among them and from Beautifil. For dentin, the groups DCPD60%, Beautifil, Fuji II LC, Z350 and Fuji IX were no significant different and presented lower loss than VB. These five groups were also no different from DCPD30%, except Fuji IX. Regarding the restoration, the highest loss was observed for Fuji IX, with no difference from Fuji II LC and Beautifil. DCPD30%, Z350, VB and DCPD60% presented minimum values of surface loss, without differences between them. It was concluded that Fuji II LC ionomeric cement was the only material able to protect the enamel adjacent to the restoration against erosive and erosive/abrasive challenges, although it was one of the materials that was most susceptible to be wear off by both challenges. For dentin, no material exhibited a significant protective effect.
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Mello, Pâmela Carbone. « Avaliação da resistência à abrasão, microdureza superficial e estabilidade de cor de dentes artificiais de resina acrílica ». Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-28032008-174332/.
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O objetivo deste trabalho foi avaliar in vitro a resistência a abrasão, a microdureza superficial e a estabilidade de cor de dentes artificiais de resina acrílica. Sete grupos (1- Biolux, 2- Trilux, 3- Blue Dent, 4- Biocler, 5- Orthosit-Vivodent, 6- Postaris-Antaris, 7- Gnathostar-Ivostar), compostos de 12 pre-molares superiores de cada fabricante, sendo 6 contra antagonistas metálicos (Ni-Cr) e 6 contra antagonistas de resina indireta (Solidex), foram delineados em um perfilômetro, antes e após serem submetidos ao ensaio de abrasão. A diferença linear entre a primeira e a segunda leitura foi medida com um paquímetro digital (precisao 0,01mm). Após a análise estatística (análise de variância, teste de Tukey-Kramer, nível de significancia em p<0,05), observou-se que houve diferenças estatísticas significantes entre os grupos e que a marca Postaris apresentou os menores valores de desgaste contra ambos os antagonistas (R=2,33±0,91µm e M=1,78±0,42µm). Para a análise da microdureza superficial Vickers, foram utilizados 6 incisivos laterais superiores de cada marca e 3 leituras (terços incisal, médio e cervical) foram feitas com o auxílio de um microdurômetro. As médias de microdureza superficial Vickers foram submetidas a análise estatística (nível de significancia p<0,05) e com os resultados obtidos concluiu-se que o grupo Biolux (22,1±0,91VHN) seguido do Antaris (21,9±1,58VHN), Ivostar (21,1±0,98VHN) e Biocler (21,0±1,80VHN) apresentaram maiores valores de dureza diferenciando-se do Vivodent (19,1±0,99VHN) e Blue Dent (18,9±1,54VHN), menos duros. Para o ensaio de estabilidade de cor foram utilizados 6 incisivos centrais superiores direitos de cada marca comercial (n=42), submetidos ao processo de envelhecimento artificial acelerado. O aparelho de leitura de cor utilizado foi um Espectrocolorímetro Portátil Modelo Color Guide 45/0 (BYK-Gardner, Alemanha). Cada dente teve sua cor lida antes e imediatamente após o ensaio de envelhecimento artificial. Os valores de ΔE foram submetidos a análise estatística com auxílio do programa JMP 5.1 (SAS Institute, EUA) e mostraram que houve diferenças estatisticamente significantes entres os grupos e que apenas a marca Blue Dent (4,37±0,32) apresentou valores de ΔE>3,3 considerado, segunda a literatura, clinicamente inaceitável. Para os grupos que tiveram alterações clinicamente aceitáveis, o grupo Antaris/Postaris teve a maior variação de cor (ΔE=2,73±0,96) e o grupo Biolux apresentou a menor variação de cor (1,39±0,27). Dentro das limitações da metodologia empregada, concluiu-se que o antagonista utilizado (metal ou resina) influencia a escolha do dente artificial, e que os dentes artificiais testados tem comportamentos diferentes quanto a resistência a abrasão, microdureza superficial e estabilidade de cor.The objective of this work was to evaluate in vitro the abrasion resistance, the superficial microhardness and the color stability of acrylic resin artificial teeth. Seven groups (1-Biolux, 2 - Trilux, 3 - Blue Dent, 4 - Biocler, 5 - Orthosit-Vivodent, 6 - Postaris-Antaris, 7 - Gnathostar-Ivostar), composed of 12 upper premolar for each manufacturer\'s, being 6 against metallic antagonists (Ni-Cr) and 6 against indirect resin (Solidex) antagonists, were delineated in a perfilometer, before and after the abrasion test. The linear difference between the first and the second readings was measured with a digital calliper (0,01mm precision). After the statistical analysis (variance analysis, Tukey-Kramer\'s test, p<0.05), it was observed that there were significant differences among the groups and that the trademark Postaris presented the smallest wear values against both antagonists (R=2,33±0,91µm and M=1,78±0,42µm). For Vickers superficial microhardness, 6 lateral upper incisors of each mark and 3 readings were used (incisal, medium, and cervical thirds) done with the microdurometer. The averages of Vickers superficial microhardness were submitted to the statistical analysis (p<0.05) and the obtained results show that the group Biolux (22,1±0,91VHN) followed by Antaris (21,9±1,58VHN), Ivostar (21,1±0,98VHN) and Biocler (21,0±1,80VHN) presented higher values, differing from Vivodent (19,1±0,99VHN) and Blue Dent (18,9±1,54VHN), less harders. For the color stability test 6 upper right central incisors of each commercial mark were used (n=42), submitted to the accelerated artificial aging process. The apparel for color reading was a Portable Spectruncolorimeter Model Color Guide 45/0 (BYK-Gardner, Germany). Each tooth had his color read before and immediately after the artificial aging. The ΔE values were submitted to the statistical analysis with JMP 5.1 (HEALTHY Institute, USA) software and show that significant differences were found among the groups and that only Blue Dent (4,37±0,32) presented clinically unacceptable values of ΔE (ΔE>3.3). For the groups that had clinically acceptable color alterations, the Antaris/Postaris group had the largest color variation (ΔE=2.73±0.96) and the Biolux group presented to smallest color variation (ΔE=1.39±0.27). Within the limitations of the methodology, was concluded that the antagonist (metal or resin) influence the choice of the artificial tooth, and that the tested artificial teeth have different behaviors for the abrasion resistance, superficial microhardness and color stability.
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Correr-Nolasco, Gisele Maria. « Degradação de materiais restauradores resinosos e do esmalte deciduo e permanente em soluções simuladoras da dieta ». [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288592.
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Orientador: Regina Maria Puppin RontaniTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A cavidade bucal é considerada um ambiente agressivo onde a estrutura dentária e os materiais restauradores estão constantemente sujeitos a desafios térmicos, mecânicos e quÃmicos. A associação destes fatores está diretamente relacionada à longevidade/estabilidade das restaurações, bem como à preservação da estrutura dentária. A exposição da estrutura dentária e dos materiais restauradores resinosos aos agentes da dieta pode causar erosão dental, amolecimento e aumento da rugosidade de restaurações resinosas, deixando-as mais susceptÃveis ao desgaste. Dessa forma, os objetivos desta tese fundamentada em três capÃtulos foram: (1) avaliar o efeito do armazenamento em longo prazo em diferentes soluções simuladoras da dieta na rugosidade superficial de materiais restauradores resinosos; (2) avaliar o efeito da associação dos desafios erosivo e abrasivo no desgaste do esmalte decÃduo e permanente; (3) avaliar o efeito da associação dos desafios corrosivo e abrasivo no desgaste de materiais restauradores resinosos. No capÃtulo 1, sessenta amostras de diferentes materiais restauradores (Filtek Z250, Esthet X, Filtek Flow, Dyract AP e Vitremer) foram armazenadas em 5 lÃquidos simuladores da dieta (água destilada, ácido lático, ácido cÃtrico, refrigerante a base de cola (Coca-Cola) e álcool) por até 6 meses. A rugosidade superficial das amostras foi mensurada após o polimento (baseline), 1 semana, 1 mês, 3 meses e 6 meses de armazenamento. Houve aumento significativo na rugosidade superficial apenas para Esthet X armazenado em Coca-Cola e em ácido cÃtrico após 1 e 3 meses, respectivamente; e para Dyract AP armazenado em água destilada após 6 meses. No capÃtulo 2, foram obtidas amostras planas de esmalte decÃduo e permanente (n=10), as quais foram submetidas ao desgaste (100.000 ciclos a 1,9 Hz) em meio neutro (água deionizada) e meio ácido (ácido cÃtrico). Antes e após o desgaste, as amostras foram analisadas em perfilÃ'metro (MTS 3D Profiler). A alteração do volume e a profundidade máxima do desgaste foram quantificadas utilizando o software Ansur 3D. O esmalte decÃduo apresentou maior desgaste que o esmalte permanente, independentemente do meio. O meio ácido proporcionou maior desgaste do que o meio neutro (p<0,05). Diferença significativa entre meio neutro e ácido foi observada apenas para o esmalte decÃduo. No capÃtulo 3, dez amostras de cada material [Filtek Supreme (S), Point 4 (P), Dyract AP (D) e Fuji II LC (F)] foram confeccionadas e submetidas ao desgaste (100.000 ciclos a 1,9 Hz) em meio neutro (água) e meio ácido (ácido cÃtrico). Antes e após o desgaste, as amostras foram analisadas em perfilÃ'metro (MTS 3D Profiler). A alteração do volume e a profundidade máxima do desgaste foram quantificadas utilizando o software Ansur 3D. Diferença significativa no desgaste dos materiais foi observada (S=P
Materiais Dentarios
Doutor em Materiais Dentários
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ADACHI, LENA K. « Estudo in vitro do desgaste do esmalte dental pelos materiais restauradores utilizando metodo radiometrico ». reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10811.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Dissertacao [Mestrado]
IEA/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:98/01953-0
Livres sur le sujet "Teeth Abrasion"
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Wahome, E. W. The significance of dental attrition in the reconstruction of prehistoric diets : A general review. [Nairobi] : University of Nairobi, Dept. of History, 1989.
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Incremental structures and wear patterns of teeth for age assessment of red deer. Oxford : Archaeopress, 2008.
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Enamel microabrasion. Chicago : Quintessence Pub. Co., 1991.
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Mashloosh, K. M. Abrasive wear with particular reference to digger teeth. Uxbridge : Brunel University, 1987.
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Dental Microwear in Natufian Hunter-Gatherers and Pre-Pottery Neolithic Agriculturalists from Northern Israel. Not Avail, 2005.
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An introduction to pet dental care : for veterinary nurses and technicians. Wallingford : CABI, 2021. http://dx.doi.org/10.1079/9781789248869.0000.
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Abstract This book contains 16 illustrated chapters on periodontal disease; comprehensive oral health assessment and treatment (COHAT); dental instrument use and maintenance; dental charting, dental radiography and pain management; tooth fractures, discoloured teeth, abrasion and attrition; tooth resorption and caries; malocclusions; oral masses and cysts; stomatitis, feline juvenile gingivitis and contact mucositis; jaw fractures, temporomandibular joint luxation and avulsed and luxated teeth; common dental problems of rabbits, rodents and other small mammals; gaining client compliance, dental estimates and the dangers of anaesthesia-free dentistry; admitting, preparing and recovering dental patients and a day in the life of a pet receiving a COHAT; postoperative home care; developing dental home care programmes; how to brush the teeth of dogs and cats; understanding the science behind dental home care products and advocating for pet dental health. It aims to aims to bridge the gap that exists between current training for veterinary nurses in veterinary dentistry and what is required of veterinary practice.
Chapitres de livres sur le sujet "Teeth Abrasion"
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Istace, Kathy. « If it's broke, fix it ! Tooth fractures, discoloured teeth, abrasion and attrition. » Dans An introduction to pet dental care : for veterinary nurses and technicians, 80–101. Wallingford : CABI, 2021. http://dx.doi.org/10.1079/9781789248869.0004.
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Abstract This chapter contains information on why fractured teeth of pets should be treated and on the treatment options available such as extraction, endodontic treatments, dental restorations and prosthodontics.
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Livaditis, Joanne M., et Gus J. Livaditis. « The Use of Custom-Milled Zirconia Teeth to Address Tooth Abrasion in Complete Dentures ». Dans Journal of Prosthodontics on Complex Restorations, 205–13. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274605.ch28.
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Watanabe, Koji, Shigeru Watanabe et Kenshi Maki. « When to Brush Teeth after Single Short Time Intake of Carbonated Soft Drink to Prevent Enamel Abrasion ? » Dans Highlights on Medicine and Medical Research Vol. 1, 8–12. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/hmmr/v1/6928d.
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Kilpatrick, N. M., et L. A. L. Burbridge. « Advanced restorative dentistry ». Dans Paediatric Dentistry. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789277.003.0019.
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The aim of this chapter is to cover the management of more complicated clinical problems associated with children and adolescents: tooth discolouration, inherited enamel and dentine defects, hypodontia, and tooth surface loss. As there is considerable overlap in the application of the various restorative techniques, the chapter is divided into two parts. The first outlines the clinical steps involved in the various procedures, while the second covers the more general principles of management of particular dental problems. It is not the remit of this chapter to cover advanced restorative dentistry in detail, but many of the techniques and indications used in children are the same as those for adults (Boxes 11.1 and 11.2). With the aid of some clinical examples, eight of the restorative procedures will be described in simple stages. Omitted from this list are the stages involved in the provision of full crown restorations and bridgework, which are the specific remit of a restorative dentistry textbook. However, the provision of porcelain veneers, more commonly associated with adult patients, will be mentioned briefly. This technique involves the daily placement of carbamide peroxide gel into a custom-fitted tray on either the upper or the lower arch. As the name suggests, it is carried out by the patient at home and is initially done on a daily basis. • Mild fluorosis. • Moderate fluorosis as an adjunct to hydrochloric acid–pumice micro-abrasion. • Yellowing of ageing. • Single teeth with sclerosed pulp chambers and canals. • Selective bleaching for aesthetic purposes. • Upper impression and working model. • Soft mouthguard—avoiding the gingival tissues. • 10% carbamide peroxide gel. 1. Take an alginate impression of the arch to be treated and cast a working model in stone. 2. Relieve the labial surfaces of the teeth by about 0.5mm and make an acrylic pull-down vacuum-formed splint as a mouthguard with or without reservoirs for bleaching agent on the teeth requiring lightening. The splint should be no more than 2mm thick and should not cover the gingival tissues. It is only a vehicle for the bleaching gel and is not intended to protect the gingivae.
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Kemp, T. S. « 6. Herbivorous mammals ». Dans Mammals : A Very Short Introduction, 65–81. Oxford University Press, 2017. http://dx.doi.org/10.1093/actrade/9780198766940.003.0006.
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Compared to a predator’s diet, plant food has two great advantages: it is abundant and it does not run away. ‘Herbivorous mammals’ explains how these advantages are matched by difficulties: plants are generally of low nutritional value and must be eaten in large amounts; leaves with protective abrasive particles can quickly wear down herbivores’ chewing teeth; and mammals cannot make their own cellulase enzymes for breaking down cellulose to sugars. The eating habits and the challenges of small herbivores (e.g. rodents, rabbits, and hyraxes) are considered, as well as those of large ungulates and elephants; marsupial herbivores (e.g. kangaroos, wombats, and koalas); and specialist herbivores (pandas, dugongs, and manatees).
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Gutsalenko, Yuriy, et Tetyana Tretyak. « FORMATION OF WORKING SURFACES AND RESEARCH OF QUALITATIVE INDICATORS OF NON-EVOLVENT GEARS (REVIEW AND PROSPECTS OF DEVELOPMENT) ». Dans Integration of traditional and innovation processes of development of modern science. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-26-021-6-35.
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From the standpoint of the development of possibilities of application in theory and practice, the works of Prof. B. A. Perepelitsa from Kharkov Polytechnic Institute and his disciples to develop an applied methodology of multiparameter mappings in relation to the profiling and functioning of complex curvilinear objects and transmission mechanisms in mechanical engineering, mainly with examples of gears, are presented. The work substantiates the relevance of the study of gears with a complex non-involute profile of the side surfaces of the teeth, which in some applications have advantages over involute gears and are devoid of some of their drawbacks associated with quality indicators. A technique for obtaining mating surfaces of the teeth of non-invasive gears as envelopes of the specified surfaces of the teeth of tools is described. A scheme for forming pairs of non-involute gears, from which a gearing can be composed, is proposed. At the same time, diamond-abrasive tools are considered as shaping the working gear profile in its cutting according to the copying scheme and finishing according to the rolling honing scheme. In the first case, the profile of a special shaped tool on a high-strength metal bond is supported by a master electrode according to the scheme of the anodic connection of the tool into the electric circuit of dressing, similar to diamond spark grinding. In the second case, the use of gear wheels-hones on elastic ligaments is shown. It is shown that to obtain the mating surfaces of the teeth of two non-involute gears, two tool rails can be used with the profiles of the side surfaces of the teeth opposite to each other. As a nonlinear profile of the tooth lateral surface of the tool rail, some part of one of the simulated flat kinematic curves is considered. A description of the program developed in accordance with the described method is given, which allows you to calculate the geometric characteristics of the shaped profiles of the gear pair wheels, visualize the shaping process, and also determine the quality indicators of the gearing. Thus, the prerequisites were created for choosing from the resulting geometric modeling of the curve field of such tooth profiles of the tools, which would provide the most rational combination of the tooth profiles of the gears processed by them and the required quality parameters of the gear teeth. The results of the study of the pressure ratio between the teeth of a gear and the overlap ratio of gears when choosing the shape of the tooth profiles are presented. A series of numerical experiments for gearing, formed by pairs of tool rails with different profiles of the side surfaces of the teeth straight, convex and concave, as well as convex-concave were performed. It is shown that non-involute gearing can have large reduced radii of curvature (and consequently smaller pressure coefficients) at the points of tangency of the profiles compared to involute gearing with a slight increase or decrease in the gearing overlap ratio. The most preferable is the variant of the rails with convex and concave tooth profiles, which provides the best values of both quality indicators of the engagement.
Actes de conférences sur le sujet "Teeth Abrasion"
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Vakhovskyi, V. V., V. Yu Filimonov, S. O. Filimonova, O. V. Androshchuk et O. V. Shypytsyna. « Air abrasive method of preparation of hard tissues of teeth in the treatment of caries ». Dans THE CONCEPT OF MODERN PHARMACY AND MEDICINE IN UKRAINE AND EU COUNTRIES. Baltija Publishing, 2021. http://dx.doi.org/10.30525/978-9934-26-113-8-20.
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Suryo, S. Hadi, A. P. Bayuseno, J. Jamari et Muhammad Arief Rahmat Ramadhan. « Analysis of AISI material power of AISI 4140 bucket teeth excavator using influence of abrasive wear ». Dans HUMAN-DEDICATED SUSTAINABLE PRODUCT AND PROCESS DESIGN : MATERIALS, RESOURCES, AND ENERGY : Proceedings of the 4th International Conference on Engineering, Technology, and Industrial Application (ICETIA) 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5042942.
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Wang, Zegui, Xiaopeng Xie et Jianhua Zhang. « Experimental Study on Running-In of Steel Gear Pairs With Micro- and Nano-Materials ». Dans 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21121.
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First, the paper put forward the method of making running-in oils with micro-quartz or nano-diamond powder. Then, the two oils were applied to the running-in of a gear pair respectively. The gears were made of steel C45E4 and by gear shaping. The tooth surfaces of the involute spur gears are fairly rough and soft. These parameters were measured as following: direct-reading and analytical ferrograph of oil samples, electric resistance between the gear pair, oil temperature, 3D-topography and energy spectrum and scan electron image of the tooth surfaces. The results showed that the running-in wear under the micro-oil is much more severer and unstabler than that under the nano-oil. The nano-particles can adsorb and fill into the tooth surface hollows, which improves the surface properties of the metal teeth. The micro-particles mainly form abrasive wear. The running-in wear mechanism of the gear pair under nano- and micro-oils mainly consists of adhesive, oxidative, sliding and abrasive wears. Furthermore, the electric phenomenon, “negative electric resistance”, happened in the running-in wear of the gear pair.
Rapports d'organisations sur le sujet "Teeth Abrasion"
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MALDONADO, KARELYS, JUAN ESPINOZA, DANIELA ASTUDILLO et WILSON BRAVO. Fatigue and fracture resistance and survival of occlusal veneers of composite resin and ceramics blocks in posterior teeth with occlusal wear : A protocol for a systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, octobre 2021. http://dx.doi.org/10.37766/inplasy2021.10.0036.
Texte intégralRésumé :
Review question / Objective: The aim of this systematic review is to synthesize the scientific evidence that evaluates fatigue and fracture resistance, survival, and stress distribution, of composite resin CAD/CAM and ceramic CAD/CAM occlusal veneers in posterior teeth with severe occlusal wear. Condition being studied: Currently there is an increase in cases of dental wear, due to several factors such as: excessive consumption of carbonated drinks, a diet high in acids, gastric diseases, anorexia, bulimia, dental grinding, use of highly abrasive toothpastes, or a combination of these(9) (10) (11) (12); which affect the patient in several aspects: loss of vertical dimension, sensitivity due to the exposure of dentin, esthetics, affectation of the neuromuscular system(11) (13) (14). With the advent of minimally invasive dentistry, occlusal veneers have been found to be a valid option to rehabilitate this type of cases and thus avoid greater wear of the dental structure with full coverage restorations. Sometimes when performing a tabletop it is not necessary to perform any preparation, thus preserving the maximum amount of dental tissue(3) (6) (15). Due to the masticatory load either in patients without parafunction where the maximum masticatory force is approximately 424 N for women and 630 N for men or in those who present parafunction where the maximum bite force can vary from 780 to 1120N(7), it is necessary that the occlusal veneers support that load which makes indispensable a compilation of studies investigating both fatigue and fracture resistance and the survival rate of occlusal veneers in different materials and thicknesses.