Articoli di riviste: "Dental materials Evaluation"

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Khurram, Maleeha, Khurram Jah Zafar, Aneela Qaisar, Tahmeena Atiq e Sohail Abbas Khan. "RESTORATIVE DENTAL MATERIALS". Professional Medical Journal 25, n. 01 (8 gennaio 2018): 140–49. http://dx.doi.org/10.29309/tpmj/18.4230.

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Wendt, Stanley L., Thomas L. Ziemiecki e Larz S. Spångberg. "Indirect cytotoxic evaluation of dental materials". Oral Surgery, Oral Medicine, Oral Pathology 75, n. 3 (marzo 1993): 353–56. http://dx.doi.org/10.1016/0030-4220(93)90150-3.

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Polyzois, G. L. "In vitro evaluation of dental materials". Clinical Materials 16, n. 1 (gennaio 1994): 21–60. http://dx.doi.org/10.1016/0267-6605(94)90088-4.

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HE, Li-Hong, Lyndie FOSTER PAGE e David PURTON. "An evaluation of dental operative simulation materials". Dental Materials Journal 31, n. 4 (2012): 645–49. http://dx.doi.org/10.4012/dmj.2011-264.

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Wennberg, Alf. "Cell Culture in the Biological Evaluation of Dental Materials: A Review". Alternatives to Laboratory Animals 13, n. 3 (marzo 1985): 194–202. http://dx.doi.org/10.1177/026119298501300305.

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Systematic research on dental materials began after World War I. For a long time the research was focused on the physical properties of the materials, and papers dealing with biological aspects were scarce. By the late 1950s a growing interest in biological responses to dental materials developed, and from the 1970s biological and physical evaluations were deemed equally important (1). Mammalian cells have been maintained in vitro since the early years of this century, but the use of cultured cells to evaluate the effects of chemicals and drugs is a more recent occurrence. The first practical application of this technique was in pharmacological investigations (2), but applications in other fields soon followed, and in 1955 the first studies were reported where a cell culture technique had been applied to the biological evaluation of dental materials (3,4). Since then the use of cell culture systems in dental materials research has grown rapidly. The main application has been for the assessment of cytotoxic effects, and the purpose of this paper is to review different test methods and discuss some facets of the problems posed by the cytotoxicity testing of dental materials.

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KNIBBS, P. J. "Methods of clinical evaluation of dental restorative materials". Journal of Oral Rehabilitation 24, n. 2 (28 giugno 2008): 109–23. http://dx.doi.org/10.1111/j.1365-2842.1997.tb00303.x.

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Udod, O. A., e O. B. Roman. "COMPARATIVE CLINICAL EVALUATION OF DENTAL RESTORATIONS WITH VARIOUS MATERIALS". Bulletin of Problems Biology and Medicine 4, n. 2 (2020): 386. http://dx.doi.org/10.29254/2077-4214-2019-4-2-154-386-389.

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KNIBBS, P. J. "Review Methods of clinical evaluation of dental restorative materials". Journal of Oral Rehabilitation 24, n. 2 (febbraio 1997): 109–23. http://dx.doi.org/10.1046/j.1365-2842.1997.00437.x.

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Barreto, B. C. F., L. H. A. Raposo, S. J. B. Sousa, A. G. Pereira, A. Versluis, L. Correr-Sobrinho e C. J. Soares. "Three-point bending test parameters for dental materials evaluation". Dental Materials 28 (gennaio 2012): e2-e3. http://dx.doi.org/10.1016/j.dental.2012.07.012.

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Mackert, J. R. "Side-Effects of Dental Ceramics". Advances in Dental Research 6, n. 1 (settembre 1992): 90–93. http://dx.doi.org/10.1177/08959374920060012301.

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Evaluation of side-effects to low-dose exposure of any agent is difficult, especially if the agent exhibits a low toxicity. The most common way to approach such evaluation is to define special groups which are exposed more than others. Studies of such risk groups may facilitate interpretation of information related to those exposed to a low dose. For dental materials, dentists, dental assistants, and laboratory technicians represent typical risk groups. In addition to receiving dental treatments and having restorations like anyone else, they handle the materials in their daily work. The exposure to the materials occurs more frequently and at a higher dose for these groups than for the patient receiving dental treatment. Thus, the possibilities for side-effects are greater. Some materials are handled more closely by laboratory technicians than by other members of the dental team, e.g., dental ceramics.

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Vulović, Stefan, Ivica Stančić, Aleksandra Popovac e Aleksandra Milić-Lemić. "Surface roughness evaluation of different novel CAD/CAM dental materials". Tribology and Materials 1, n. 2 (2022): 55–60. http://dx.doi.org/10.46793/tribomat.2022.010.

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The aim of the study was to evaluate and compare surface roughness among different CAD/CAM dental materials when all materials are finished and polished according to the manufacturer's instructions. The 45 specimens were split into three groups: RBC (resin-based composite), ZR (zirconia) and CoCr4 (CoCr4 alloy). The surface roughness was evaluated using a mechanical profilometer, atomic force microscopy (AFM) and scanning electron microscopy (SEM) analyses. The data were analysed using the Kruskal-Wallis test with a Dunn's post hoc analysis and all data were presented as mean ± SD. Surface roughness analysis on a microscale (μm) revealed significantly higher Ra (μm) mean values in the ZR group compared to RBC and (p < 0.05) and CoCr4 group (p < 0.05), between which no statistically significant difference was observed (p > 0.05). Surface roughness analysis on a nanoscale (nm) has shown the opposite results, with the lowest values in the ZR group and statistically significant differences among all material groups (p < 0.05). AFM 3D and SEM 2D images revealed heterogeneous surface morphology for all groups.

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Bezgin, Tugba, Ceren Cimen e Nurhan Ozalp. "Evaluation of Residual Monomers Eluted from Pediatric Dental Restorative Materials". BioMed Research International 2021 (16 settembre 2021): 1–8. http://dx.doi.org/10.1155/2021/6316171.

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Unreacted monomers eluted from resin-based restorative materials have been considered a reason of local and systemic adverse reactions. This study was designed to determine the effect of finishing and polishing procedures on the elution of Bis-GMA, TEGDMA, UDMA, and HEMA monomers from compomer and bulk-fill composite resins. Bulk-fill composite (3M ESPE GmbH, Seefeld, Germany) and compomer (Dentsply DeTrey GmbH, Konstanz, Germany) specimens with 3 × 4 mm diameters were prepared. The specimens were randomly divided into two groups, and finishing-polishing procedures were applied only to the experimental groups. Release of residual monomers was analyzed by using High-Performance Liquid Chromatography (HPLC) after 24, 48, and 72 hours. Repeated measures ANOVA and Tukey post hoc tests were used for comparisons. Finishing and polishing procedures had a significant effect on reducing the quantity of UDMA release in the Filtek™ Bulk Fill composite and Bis-GMA, HEMA, and TEGDMA in the Dyract XP compomer ( p < 0.05 ). The restorative materials investigated here are not chemically stable after polymerization, and concentrations of eluted monomers may reach critical toxicity levels even after one restoration placement. Finishing and polishing procedures are mandatory to reduce residual monomers.

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Nieva, N., C. Arreguez, R. N. Carrizo, C. Saborido Molé e G. M. Lagarrigue. "Bonding Strength Evaluation on Metal/Ceramic Interfaces in Dental Materials". Procedia Materials Science 1 (2012): 475–82. http://dx.doi.org/10.1016/j.mspro.2012.06.064.

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Li, J., J. X. Zhu, A. S. Bassi e S. H. Kofman. "Evaluation of different dental materials using a slugging fluidized bed". Powder Technology 118, n. 3 (agosto 2001): 275–84. http://dx.doi.org/10.1016/s0032-5910(00)00399-5.

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Peskersoy, Cem, e Osman Culha. "Comparative Evaluation of Mechanical Properties of Dental Nanomaterials". Journal of Nanomaterials 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6171578.

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This study examines the properties of nanobased dental restorative materials with nanoindentation method in a precise, repeatable, and comparable way. Microhybrid and nanohybrid composites, conventional glass ionomer materials, and light cured nanoionomer materials were utilised for the study. Specimen discs (r=10 mm,h=2 mm) were prepared to test the hardness, modulus of elasticity, yield strength, and fracture toughness values for each sample in a nanoindentation device with an atomic force microscopy add-on (n=25). Comparative analyses were performed by one-way ANOVA and post hoc Tukey tests. The hardness and modulus of elasticity values of nanocomposite were higher (2.58 GPa and 32.86 GPa, resp.) than those of other dental materials. Although glass ionomer exhibited a hardness that was similar to a nanoionomer (0.81 versus 0.87 GPa), glass ionomer had the lowest fracture toughness value (Kc=0.83 MPa/mm0.5). The mechanical properties of resin composites improve with additional nanoscale fillers, unlike the glass ionomer material.

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Briso, ALF, LP Caruzo, APA Guedes, A. Catelan e PH dos Santos. "In Vitro Evaluation of Surface Roughness and Microhardness of Restorative Materials Submitted to Erosive Challenges". Operative Dentistry 36, n. 4 (1 luglio 2011): 397–402. http://dx.doi.org/10.2341/10-356-l.

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Kukhta, V. S., e О. S. Kyrmanov. "THE EVALUATION OF CURRENT RESEARCH ON THE STRENGTH OF DENTAL RESTORATIVE COMPOSITE MATERIALS". Ukrainian Dental Almanac, n. 2 (27 giugno 2022): 5–9. http://dx.doi.org/10.31718/2409-0255.2.2022.01.

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The aim of the study: to analyze the sources of scientific and metric information on the state of research on the strength of dental composites for tooth restoration. It has been determined that the range of composite materials available on the dental market is very wide. They differ significantly in chemical, mechanical, physical, and biological characteristics, operating properties, techniques of their usage. All this requires special training to use the composites effectively and to get high quality restoration results. The optimal choice of material and suitable technique taking into account a particular clinical situation can increase the durability of restorations and prevent the development of complications that largely depends on the strength characteristics of composites. At present, the problem of selecting and creating the perfect filling material has not been completely solved that is confirmed by the large number of new developments in materials science. At the same time, composite polymers are gaining ground in dental practice. The new concept of adhesive preparation of dental tissues before inserting filling material and improving the properties of the composite materials themselves contribute to the maximum preservation of healthy dental tissues, increase the aesthetics, durability and functionality of dental restorations. It has been determined that the mechanical strength characteristics of composite materials play a significant role in the longevity/durability of restorations depending on different chewing force and occlusal loading. It is important to investigate factors, which may cause the destruction of dental composites during the functional loading. The physical and mechanical properties of dental composites are impacted by a number of factors, including the type of polymer matrix, the amount of material takes, size and distribution of the filler, the state of the bond between the filler and the matrix, the degree of polymerization. The choice of a material also depends on a number of characteristics in terms of the combination of main components. Since the material parameters set by the material manufacturers can not be changes, the deep understanding of its properties will help to choose the best material in each clinical situation. The main physical properties of dental composites include compressive and tensile strength, modulus of elasticity, coefficient of thermal expansion, wear resistance, polymerization shrinkage, X-ray contrast, density and thixotropy, optical effects (transparency, fluorescence, etc.). The AE method based on the registration of elastic waves arising from the formation, change and destruction of the structure of various materials, is currently the most effective for studying the processes and stages of development of material defects. It enables in detecting initial changes in the material structure, the initial location of defects, the direction of their spreading and determining the maximum strength of the material. The advantages of this method include the ability to obtain information about the destruction in the early stages, its high accuracy and sensitivitys. The AE method is commonly used to study the resistance to destruction of various composite materials, the study of the tooth / composite interface, the analysis of polymerization stresses and the degree of shrinkage.

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Bramanti, Ennio, Gabriele Cervino, Floriana Lauritano, Luca Fiorillo, Cesare D’Amico, Sergio Sambataro, Deborah Denaro et al. "FEM and Von Mises Analysis on Prosthetic Crowns Structural Elements: Evaluation of Different Applied Materials". Scientific World Journal 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/1029574.

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The aim of this paper is to underline the mechanical properties of dental single crown prosthodontics materials in order to differentiate the possibility of using each material for typical clinical condition and masticatory load. Objective of the investigation is to highlight the stress distribution over different common dental crowns by using computer-aided design software and a three-dimensional virtual model. By using engineering systems of analyses like FEM and Von Mises investigations it has been highlighted the strength over simulated lower first premolar crowns made by chrome cobalt alloy, golden alloy, dental resin, and zirconia. The prosthodontics crown models have been created and put on simulated chewing stresses. The three-dimensional models were subjected to axial and oblique forces and both guaranteed expected results over simulated masticatory cycle. Dental resin presented the low value of fracture while high values have been recorded for the metal alloy and zirconia. Clinicians should choose the better prosthetic solution for the teeth they want to restore and replace. Both prosthetic dental crowns offer long-term success if applied following the manufacture guide limitations and suggestions.

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Gasparik, Cristina, Alexandra Botos, Bogdan Culic, Mindra Badea e Diana Dudea. "Instrumental Color Evaluation of Ceramic Materials by Using Two Dental Spectrophotometers". Key Engineering Materials 614 (giugno 2014): 118–23. http://dx.doi.org/10.4028/www.scientific.net/kem.614.118.

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Objectives: The aim of the present study was to evaluate the precision of two dental spectrophotometers in evaluating the color parameters of ceramic materials and to assess the accuracy of a dental spectrophotometer (Shade Pilot, Degudent) for analyzing color parameters of lithium-disilicate ceramic materials. Methods: The CIE L*a*b* color parameters, chroma and hue angle of 6 groups of lithium-disilicate ceramic ingots were recorded: MO0, HO0, LTA1, HTA1, LTBL1, HTBL. The measurements were performed in a viewing-booth under a D65 illuminant. Statistical analysis was performed to assess the precision and differences between the two color-measuring devices. Results: Significant differences were found between all color parameters recorded (p<0.001). The difference varied depending on the type of ceramic ingot assessed. The HO0 ingot showed the highest color difference (ΔE=19.18), while the smallest color difference was found for the MO0 ingot (ΔE=5.62). Conclusions: Color parameters of ceramic materials can be recorded with both color-measuring devices, the VEA showing the highest precision.

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Hamouda, Ibrahim M., Noha A. El-Waseffy, Ahmed M. Hasan e Abeer A. El-Falal. "Evaluation of an experimental dental porcelain". Journal of the Mechanical Behavior of Biomedical Materials 3, n. 8 (novembre 2010): 610–18. http://dx.doi.org/10.1016/j.jmbbm.2010.07.011.

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Sun, Limei, Junwu Liu e Lin Zhang. "Evaluation of friction in different oral restoration materials and its influencing factors". Materials Express 10, n. 10 (31 ottobre 2020): 1746–52. http://dx.doi.org/10.1166/mex.2020.1790.

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This research uses nanotechnology and molecular assembly technology, using biocompatible hydroxyapatite material as the inorganic filler, organically compound and assemble with the organic resin matrix to achieve the performance shear of the composite material, thus developing strength High-resistance, easy-to-process and good biocompatibility composite resin dental restoration materials, and the nano-composite resin material flexural strength, compressive strength and water absorption value were characterized in laboratory stage, the performance fully reached the current clinical use Various indicators of imported composite resin. This study analyzed the differences in the effects and friction properties of different prosthetic materials in oral repair. In order to better simulate the friction and wear performance of dental restoration materials in the oral environment, this paper studied under two conditions of oil lubrication and artificial saliva lubrication, and the wear mechanism from the macro aspects of friction coefficient, wear rate, wear resistance, etc. The research results show that the abrasion performance of the nanocomposite resin is closely related to its surface morphology and characteristics. The comparison with the performance of ceramic and composite resin restoration materials shows that nanocomposite resin materials have better mechanical properties and resistance than other dental restoration wear performance.

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Kursun-Çakmak, Emine S., Nihat Akbulut e Dogan D. Öztas. "Comparative Evaluation of the Radiopacity of Bone Graft Materials used in Dentistry". Journal of Contemporary Dentistry 7, n. 3 (2017): 150–55. http://dx.doi.org/10.5005/jp-journals-10031-1204.

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ABSTRACT Introduction Ample radiopacity in order to distinguish from the surrounding tissues is a desirable property of dental graft materials. A total of 15 bone graft materials’ (BGMs) opacities were analyzed in this study. Materials and methods Graft materials were placed in the implant cavity (5 × 10 mm) in cadaver's mandible respectively. Cavity was exposed by using periapical film and a dental X-ray machine at 70 kVp and 8 mA. The optical density of the radiographic images was measured with a transmission densitometer. One-way analysis of variance (ANOVA) was conducted for statistical analysis. Results Among the materials tested, the most radiolucent bone grafts were Grafton and Allogenix with a statistical significance of p ≥ 0.05. 4Bone and Bego Oss exhibited the highest radiopacity with a statistical significance of p ≥ 0.05. Inadequate radiopacity of the dental graft materials may lead to confusion among clinicians in the radiographical follow-up. Among 15 BGMs tested, only three had higher density than bone tissue. Conclusion The radiopacity of the BGM was found to be higher than bone at only three of them. How to cite this article Kursun-Çakmak ES, Akbulut N, Öztas DD. Comparative Evaluation of the Radiopacity of Bone Graft Materials used in Dentistry. J Contemp Dent 2017;7(3):150-155.

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Hermansson, Leif, Lars Kraft, Karin Lindqvist, Nils Otto Ahnfelt e Hakan Engqvist. "Flexural Strength Measurement of Ceramic Dental Restorative Materials". Key Engineering Materials 361-363 (novembre 2007): 873–76. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.873.

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Flexural strength of a dental material reflects its ability to withstand tensile stresses and thus the fracture risk of a filling. The flexural strength of an experimental bioceramic Calcium aluminate-based (CA) dental restorative material was measured using three different methods with a composite (Tetric Ceram), a glass ionomer cement (Fuji II) and a phosphate cement (Harward) as references. The three test methods were: a) ISO 4049 for dental composites, 3-point bend test b) EN 843-1 for ceramic materials, 3-point bend test and c) ASTM F-394, biaxial ball-on-disc for ceramic materials. The strength of the CA-material, tested in the ball-on-disc method, is close to the theoretical strength based on the microstructure of the material (max. grain size of 15 μm). The composite material and the phosphate cement were rather insensitive to the test method, while the glass ionomer cement as the CA-material showed sensitivity towards the test method. A modified biaxial test method for evaluation of strength of dental materials in a close to real-life component is proposed.

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P., Deepa, Shipra Jaidka, Rani Somani, Deepti Jawa Singh, Anu Susan Joy, Jeetu Yadav, Serene a e Anaswara b. "COMPARATIVE EVALUATION OF FLUORIDE RECHARGE OF FLUORIDE RELEASING DENTAL MATERIALS BY FLUORIDATED DENTIFRICE : AN IN VITRO STUDY". International Journal of Advanced Research 10, n. 05 (31 maggio 2022): 303–16. http://dx.doi.org/10.21474/ijar01/14709.

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Introduction: Fluoride releasing dental materials releases maximum fluoride within twenty four hours which reduces thereafter.If we could recharge fluoride on the daily basis,the caries preventive effect from fluoride releasing dental materials can be prolonged. Aim and Objectives: The present study is undertaken to compare and evaluate fluoride recharge of fluoride releasing dental materials by fluoridated dentifrice. Materials and Method: Materials used in this study are GC Fuji Type IX,Fuji Plus,Zirconomer Improved,Beautifil II LS. All restorative materials were mixed according to manufacturers instruction and standardized test pellets were made using autoclaved instruments in sterile plastic moulds. These test pellets were divided in various groups and brushed with fluoridated dentifrice accordingly . Results were evaluated statistically using Post Hoc test and ANOVA and correlation coefficient for which regression lines were drawn. Result: The mean fluoride release and recharge was maximum in Zirconomer Improved, followed by GC Fuji Plus ,then by GC Fuji Type IX and least by Beautifil II LS. Conclusion:Daily recharge of fluoride releasing dental materials with fluoridated dentifrices is recommended to increase the cariostatic effect.

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Punantapong, Boonyong, Somchai Thongtem e M. J. Fagan. "Evaluation of Failure Behaviour of Coated Anisotropic Materials for Dental Implants". Journal of Metastable and Nanocrystalline Materials 23 (gennaio 2005): 23–26. http://dx.doi.org/10.4028/www.scientific.net/jmnm.23.23.

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This paper presents the results of an experimental procedure where a grid is applied to the edge of a specimen and the local crack-tip displacement fields are calculated using finite element technique. Increasingly, the objective of finite element simulations is to predict the response of the mechanics of material failure are related to microstructural process that occur in the materials as a result of the loading conditions. At the same time, The influences of coating thickness, coating stiffness, and assume crack pattern on the stresses concentration between the neighbouring layers of material are evaluated. Consequently, one approach to simulating the response of structures is to explicity model the mechanisms of damage and failure in the material.

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Fonseca, Rodrigo Borges, Carolina Assaf Branco, Francisco Haiter-Neto, Luciano de Souza Gonçalves, Carlos José Soares, Hugo Lemes Carlo, Mário Alexandre Coelho Sinhoreti e Lourenço Correr-Sobrinho. "Radiodensity evaluation of dental impression materials in comparison to tooth structures". Journal of Applied Oral Science 18, n. 5 (ottobre 2010): 467–76. http://dx.doi.org/10.1590/s1678-77572010000500007.

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Turker, Izim, e Pinar Kursoglu. "Wear evaluation of CAD-CAM dental ceramic materials by chewing simulation". Journal of Advanced Prosthodontics 13, n. 5 (2021): 281. http://dx.doi.org/10.4047/jap.2021.13.5.281.

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Chalas, Renata, Ewelina Mielko, Joanna Zubrzycka-Wrobel e Jakub Nowak. "A chemical activity evaluation of two dental calcium silicate-based materials". Current Issues in Pharmacy and Medical Sciences 28, n. 2 (1 giugno 2015): 89–91. http://dx.doi.org/10.1515/cipms-2015-0051.

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Abstract Calcium silicate-based materials are interesting products widely used in dentistry. The study was designed to compare the chemical reaction between analyzed two preparates and dentin during cavity lining. In our work, dentinal discs were prepared from human extracted teeth filled with Biodentine and MTA+. The samples were then analyzed by way of SEM, EDS and Raman spectroscopy. The obtained results revealed differences in elemental composition between both materials. Biodentine showed higher activity in contact with dentine. Moreover, the interfacial layer in the tooth filled by Biodentine was wider than that in the tooth filled with MTA+. The applied methods of analysis confirmed that both materials have a bioactive potential which is a promising ability.

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Mikaeel, Jawad, e Mustafa Namuq. "Evaluation of some properties of elastomeric dental impression materials after disinfection". Erbil Dental Journal 2, n. 1 (30 giugno 2019): 187–96. http://dx.doi.org/10.15218/edj.2019.09.

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Sajewicz, Eugeniusz. "On evaluation of wear resistance of tooth enamel and dental materials". Wear 260, n. 11-12 (giugno 2006): 1256–61. http://dx.doi.org/10.1016/j.wear.2005.08.010.

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Schmalz, Gottfried, e Gunmar Ryge. "Reprint of Criteria for the clinical evaluation of dental restorative materials". Clinical Oral Investigations 9, n. 4 (29 novembre 2005): 215–32. http://dx.doi.org/10.1007/s00784-005-0018-z.

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Cvar, John F., e Gunnar Ryge*. "Reprint of Criteria for the clinical evaluation of dental restorative materials". Clinical Oral Investigations 10, n. 1 (14 gennaio 2006): 92. http://dx.doi.org/10.1007/s00784-005-0027-y.

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Montanaro, Lucio, Davide Campoccia, Simona Rizzi, Maria Elena Donati, Lorenzo Breschi, Carlo Prati e Carla Renata Arciola. "Evaluation of bacterial adhesion of Streptococcus mutans on dental restorative materials". Biomaterials 25, n. 18 (agosto 2004): 4457–63. http://dx.doi.org/10.1016/j.biomaterials.2003.11.031.

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Ehlicke, Franziska, Jonathan Berndt, Nina Marichikj, Doris Steinmüller-Nethl, Heike Walles, Ernst-Ulrich Berndt e Jan Hansmann. "Biomimetic in vitro test system for evaluation of dental implant materials". Dental Materials 36, n. 8 (agosto 2020): 1059–70. http://dx.doi.org/10.1016/j.dental.2020.04.020.

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Dikshit, Parajeeta, Senchhema Limbu e Kreepa Bhattarai. "Evaluation of Dental Anxiety in Parents Accompanying their Children for Dental Treatment". Orthodontic Journal of Nepal 3, n. 1 (6 dicembre 2013): 47–52. http://dx.doi.org/10.3126/ojn.v3i1.9282.

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Objective: To evaluate the anxiety level of parents accompanying their children for the dental treatment. Materials & Method: Dental Anxiety Scale-Revised (DAS-R) questionnaire was filled by 101 subjects (53 females and 48 males) visiting the dental department for their children’s dental treatment. Result: 62.4 % parents accompanying their children had no or low anxiety levels and 9.9% and 5.9% showed high to severe anxiety levels respectively. There was no statistical significant difference seen between the anxiety levels in male and female parents. Conclusion: 37.6 % parents accompanying their children to the dentist showed moderate to severe anxiety levels with no significant difference seen in the overall anxiety levels of mothers and fathers. DOI: http://dx.doi.org/10.3126/ojn.v3i1.9282 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 47-52

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Maroiu, Alexandra Cristina, Cosmin Sinescu, Radu Negru, Liviu Marsavina, Ioana Delia Bretean, Virgil Florin Duma, Mihai Rominu, Cristina Maria Bortun e Meda Lavinia Negruiu. "Evaluation of the Adhesion of a Novel Design of Veneers to Dental Materials". Revista de Chimie 68, n. 9 (15 ottobre 2017): 2125–28. http://dx.doi.org/10.37358/rc.17.9.5838.

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The aim of this in vitro study was to assess a new design that, to our knowledge, we have introduced (patent pending) for indirect dental veneers. Their effect on the retention and adhesive properties at their interfaces have been studied. Fourteen high performance polymeric (PEEK) dental veneers have been elaborated using a computer-aided-design (CAD) software and then milled using a computer-aided-machine (CAM). They were divided in two experimental groups: seven classical veneers with a liniar marginal contour and seven dental veneers with the novel proposed sinusoidal marginal design. All the samples have been bonded to polymeric blocks that had the vestibular face prepared in a specific way for each group. The values of the retention and adhesive forces were tested in vitro by applying bending forces on the incisal edge of the veneers, from the oral to the vestibular direction. A 50% increase of the values of these forces for the novel design with regard to the classical one has been demonstrated through the study.

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Pešlová, Františka, Daniela Koštialiková, Richard Veselý, Andrej Dubec e Maxim Puchnin. "MICROSCOPIC EVALUATION OF THE QUALITY OF DENTAL REPLACEMENT". Acta Polytechnica CTU Proceedings 8 (30 giugno 2017): 17–19. http://dx.doi.org/10.14311/app.2017.8.0017.

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<p>The permanent tooth replacements including metal-ceramic crowns are a convenient solution for the renewing of the original function of the whole set of teeth as well as of the natural appearance. Development and preparation of suitable tooth replacement presents a real challenge for dental engineers as the replacement has to meet all the conditions and requirements of the dental medicine as well as patient’s needs and wishes. The preparation of the metal-ceramic crown is a sophisticated process and the dental engineer has to prepare alwaysa unique replacement on demand. In dental medicine there is a wide spectrum of inorganic and organic materials used formanufacturing of dental replacements. Each of the material has specific properties leading to distinct applications.Besides the material properties, the attention has to be paid to the aesthetic function and biocompatibility of the material to ensure thecomplete restoration of the whole set of teeth.</p>

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Boukhlif, Amel, Ali Merdji, Noureddine Della, El Bahri Ould Chikh, Osama Mukdadi e Rajshree Hillstrom. "Numerical Evaluation of Biomechanical Stresses in Dental Bridges Supported by Dental Implants". Journal of Biomimetics, Biomaterials and Biomedical Engineering 37 (giugno 2018): 43–54. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.37.43.

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The number of supporting dental implants is an important criterion for the surgical outcome of dental bridge fixation, which has considerable impact on biomechanical load transfer characteristics. Excessive stress at the bone–implant interface by masticatory loading may result in implant failure. The aim of this study was to evaluate the impact of the number of implants supporting the dental bridge on stress in neighboring tissues around the implants. Results of the study will provide useful information on appropriate surgical techniques for dental bridge fixation. In this study, osseointegrated smooth cylindrical dental implants of same diameter and length were numerically analyzed, using three-dimensional bone–implant models. The effect of the number of supporting implants on biomechanical stability of dental bridge was examined, using two, three and four supporting implants. All materials were assumed to be linearly elastic and isotropic. Masticatory load was applied in coron-apical direction on the external part of dental bridge. Finite Element (FE) analyses were run to solve for von Mises stress. Maximum von Mises stresses were located in the cervical line of cortical bone around dental implants. Peak von Mises stress values decreased with an increase in the number of implants that support the dental bridge. Results of this study demonstrate the importance of using the correct number of supporting implants to for dental bridge fixation.

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Crăciun, Antarinia, Ioana Bȃldea, Ana Ispas, Mîndra Eugenia Badea, Ioan Petean, Codruta Sarosi, Marioara Moldovan, Stanca Cuc, Razvan Ene e Maria Crişan. "Evaluation of Surface Characteristics and Cytotoxicity of Dental Composites". Coatings 10, n. 8 (30 luglio 2020): 749. http://dx.doi.org/10.3390/coatings10080749.

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The purpose of this study was to evaluate the surface and in vitro cytotoxicity on human dysplastic oral keratinocytes (DOK) of four commercial resins-based dental composites commonly used in prosthodontics dental therapies: two indirect composites for crown and bridges—SR Adoro (IvoclarVivadent GmbH) and Solidex (Shofu Dental GmbH); and two dual-curing luting resin cements—RelyxUnicem (3M ESPE Dental Products) and Variolink Esthetic DC (IvoclarVivadentGmbH). A complex assessment of surface characteristics of the four materials was conducted before and after the exposure to artificial saliva through various analyses, such as Scanning Electron Microscopy, Atomic Force Microscopy and Cross Polarized Light Microscopy (PLM). The results showed that DOK viability was not severely affected by exposure to any of these materials; however, Variolink expressed higher values but still above the toxicity level of the rest of the composites. The analysis of the surface structure between initial and artificial saliva exposed specimens returned a compact aspect in both categories and although Variolink and Relyx were subjected to increased roughness after saliva exposure, no damage of the internal compactness was recorded, demonstrating a fair behavior of the luting cements in contact with the saliva.

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Listina, Febria, Satria Nandar Baharza e Reka Aprilia. "Evaluation of Management of Logistic Materials Management Practice as a Dental Technician Health Service Officer 2018". Indonesian Journal of Global Health Research 4, n. 1 (15 febbraio 2022): 125–38. http://dx.doi.org/10.37287/ijghr.v4i1.846.

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Dental Engineering Department has a very big role for the creation of competent graduates. In carrying out its role, the Dental Engineering Department must be able to manage education properly and correctly, one of them is logistical management of practicum materials. The purpose of this study was to find out in depth about the evaluation of logistics management in the form of input, process, output of the management of practicum materials at the Department of Dental Engineering, Poltekkes Tanjung Karang. The logistics management function of practicum materials includes identifying, planning procurement, distributing tools to developing an effective and efficient logistics management system.The method used in this study is qualitative with 9 informants. The place of research was carried out in the dental engineering department of Health Polytechnic Tanjung Karang. Data collection is done by direct interviews and observations.The results of this study in general the management of logistics in the Department of Dental Engineering Health Polytechnic Tanjung Karang is quite good but there are still some obstacles such as inadequate Human Resources, inconsistent procedures implemented, nonstandard storage facilities and the planning process of practicum material requirements that have not used the method raw.Therefore, an additional employee in the support unit is needed, repairs to the warehouse and using a standard method, the Activity Based Casting (ABC) method.

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Esenlik, Elcin, Aslihan Atak e Ceyhan Altun. "Evaluation of dental maturation in children according to sagittal jaw relationship". European Journal of Dentistry 08, n. 01 (gennaio 2014): 038–43. http://dx.doi.org/10.4103/1305-7456.126238.

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ABSTRACT Objective: The aims of this retrospective study were to determine compliance with dental and chronological ages and to analyze the relationships between dental age and orthodontic sagittal anomalies. Materials and Methods: A total of 221 subjects between the ages of 7 and 15.9 years (165 girls and 156 boys) were included in the study. The dental age of seven left mandibular teeth was assessed according to the Demirjian method. The maxillary protrusion, mandibular protrusion, maxillo-mandibular and vertical plane angles were measured from cephalometric films. Results: The mean difference between the chronological age and dental age in female patients was 0.94 years and 0.33 years in male patients (P < 0.01). No differences between the sagittal classification groups were found. There was no relationship between dental age and the SNA° or the GoGn-SN°. A statistically significant negative relationship was found between dental age and the SNB° and there was a significant linear relationship between dental age and the ANB°. Conclusion: Dental age in girls and boys has been estimated to be more advanced than chronological age in all classes and dental maturation advanced in cases with a tendency to develop Class II malocclusions.

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Akay, Canan, e Merve Ç. Taniş. "Evaluation of Color Changes of Dental Luting Materials in Food Colorant Solutions". International Journal of Artificial Organs 40, n. 9 (24 maggio 2017): 503–9. http://dx.doi.org/10.5301/ijao.5000579.

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Background The purpose of this study was to compare the color stability and water absorption of 3 commercially available resin cements in vitro by storing them in 0.15% erythrosine, dark brown and sunset yellow for 30 days. Methods 2 self-adhesive resin cements and 1 dual/light curing, resin-based dental luting material were evaluated (total 120 samples). The CIE L, a, b of 10 mm diameter-2.0 mm height disk shaped samples was measured using a spectrophotometer for color stability on a white background, 10 mm diameter-1.0 mm height disk shaped samples were measured for water absorption before and after storage in food colorant solutions. Results The self-adhesive resin cement-sunset yellow group caused the most severe discoloration (27.89 ± 3.64) that is clinically unacceptable. The lowest discoloration was seen in the self-adhesive resin cement control group (3.35 ± 1.13). The highest water absorption was observed in the self-adhesive resin cement-dark brown group (2.41 ± 0.60) and the lowest water absorption in the dental luting material-control group (0.65 ± 0.17). Conclusions: Storage food colorant solutions affected the color stability and water absorption of different resin cement materials.

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Stavrakis, Adrian K., Sanja Kojić, Bojan Petrović, Isidora Nešković e Goran M. Stojanović. "Performance Evaluation of Dental Flosses Pre- and Post-Utilization". Materials 15, n. 4 (18 febbraio 2022): 1522. http://dx.doi.org/10.3390/ma15041522.

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Dental floss is an oral hygiene product used to remove food and plaque in places where toothbrushes cannot reach. Even though over the years since its introduction some research in suitable materials has been performed, thread cracking and wear can still compromise efficiency. The aim of this study was to examine the morphological properties of four different commercially available dental floss types before and after use. For that purpose, scanning electron microscopy and optical microscopy were used to assess the flosses before and after use, and tension testing was performed to determine any degradation in the floss performance after utilization. The analyzed floss samples verify the hypothesis that the properties of the floss need to be known in depth, before recommending a specific type to patients for daily use in all clinical indications.

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Silva, L. T. S., K. Cogo-Muller, L. C. Anami, L. M. P. Campos, D. Parra e L. C. C. Boaro. "Antibacterial activity of dental composite: Four months evaluation". Dental Materials 34 (2018): e28-e29. http://dx.doi.org/10.1016/j.dental.2018.08.059.

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Szczesio-Wlodarczyk, Agata, Monika Domarecka, Karolina Kopacz, Jerzy Sokolowski e Kinga Bociong. "An Evaluation of the Properties of Urethane Dimethacrylate-Based Dental Resins". Materials 14, n. 11 (21 maggio 2021): 2727. http://dx.doi.org/10.3390/ma14112727.

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Most of the dental materials available on the market are still based on traditional monomers such as bisphenol A-glycidyl methacrylate (Bis-GMA), urethane dimethacrylate (UDMA), triethyleneglycol dimethacrylate (TEGDMA), and ethoxylated bisphenol-A dimethacrylate (Bis-EMA). The interactions that arise in the monomer mixture and the characteristics of the resulting polymer network are the most important factors, which define the final properties of dental materials. The use of three different monomers in proper proportions may create a strong polymer matrix. In this paper, fourteen resin materials, based on urethane dimethacrylate with different co-monomers such as Bis-GMA or Bis-EMA, were evaluated. TEGDMA was used as the diluting monomer. The flexural strength (FS), diametral tensile strength (DTS), and hardness (HV) were determined. The impacts of material composition on the water absorption and dissolution were evaluated as well. The highest FS was 89.5 MPa, while the lowest was 69.7 MPa. The median DTS for the tested materials was found to range from 20 to 30 MPa. The hardness of the tested materials ranged from 14 to 16 HV. UDMA/TEGDMA matrices were characterized by the highest adsorption values. The overall results indicated that changes in the materials’ properties are not strictly proportional to the material’s compositional changes. The matrices showed good properties when the composite contained an equal mixture of Bis-GMA/Bis-EMA and UDMA or the content of the UDMA monomer was higher.

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Barria, M., e L. S. W. Spångberg. "RS 47 Artificial pulp chamber for In Vitro evaluation of dental materials". Journal of Endodontics 20, n. 4 (aprile 1994): 200. http://dx.doi.org/10.1016/s0099-2399(06)80380-8.

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Albakry, Mohammad, Massimiliano Guazzato e Michael Vincent Swain. "Fracture toughness and hardness evaluation of three pressable all-ceramic dental materials". Journal of Dentistry 31, n. 3 (marzo 2003): 181–88. http://dx.doi.org/10.1016/s0300-5712(03)00025-3.

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48

Matei, Mădălina, Elena-Adriana Voinea, Radu Rîcă, Horia Manolea, Laurențiu Mogoantă, Alex Salan, Ana Rîcă, Venera Cristina Dinescu e Nicoleta Cioateră. "New zirconia-based materials for dental applications. Structural, morphological and histological evaluation". Ceramics International 45, n. 12 (agosto 2019): 14859–66. http://dx.doi.org/10.1016/j.ceramint.2019.04.217.

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KALLUS, T., N. R. GJERDET, S. SYRJÄNEN e I. A. MJÖR. "Ranking of histologic tissue responses in the biologic evaluation of dental materials". European Journal of Oral Sciences 96, n. 3 (giugno 1988): 265–74. http://dx.doi.org/10.1111/j.1600-0722.1988.tb01554.x.

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Xu, Zhong Zi, Qing Lin, Yan Bao Li, Xiang Hui Lan e Chun Hua Lu. "An Evaluation of CaF₂ Doping Tricalcium Silicate as Dental Restorative Materials". Advanced Materials Research 47-50 (giugno 2008): 1339–42. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1339.

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The aim of this study was to evaluate the suitability of CaF2 doping tricalcium silicate (Ca3SiO5, C3S) as dental restorative materials. The solid state reaction method was used to prepare CaF2 doping C3S (F-C3S) using CaCO3, SiO2 and CaF2 as the starting materials. The in vitro bioactivity, the rate of heat evolution and the compressive strength were investigated. The in vitro bioactivity was examined by soaking the pastes in simulated body fluid (SBF). The FTIR and SEM results indicated the hydroxycarbonate apatite (HCA) layers of F-C3S pastes and pure C3S pastes occurred after soaking for 1 day and 3 days, respectively. The difference in bioactivity was attributed to the formation of F-substituted apatite, which has a Ksp lower than HCA. As compared with the pure C3S, the rate of heat evolution during the hydration of F-C3S was slower. This was avail to the dimensional stability of dental restorative materials. The pastes of F-C3S had a lower early compressive strength in the early stage, but a higher compressive strength in the later stage. Our results indicated that F-C3S would be bonded better to the teeth because of the earlier formation of HCA and the higher later compressive strength. F-C3S may be a progressive candidate for dental restorative materials.

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