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Survival rate, load to fracture and finite element analysis of anterior teeth restored with ceramic veneers varying the design prepare

Grant number: 12/03556-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2012
Effective date (End): July 31, 2013
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Marco Antonio Bottino
Grantee:César Dalmolin Bergoli
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil


The aim of this study is to evaluate the survival rate, fracture load and stress distribution of the central incisors and canines restored with ceramic veneers varying the design prepare. Thirty maxillary central incisors and thirty canines (N = 60) will be selected for the study. The specimens will be embedded up to 3 mm of the cement enamel junction with acrylic resin and periodontal ligament will be simulated using a polyether based material. After this step the specimens will be randomized into four groups (n = 15) according to the design prepare and teeth: Gr1-central incisor with conservative prepare; Gr2-Central incisor with conventional prepare with palatal chamfer; Gr3-Canine with conservative prepare; Gr4 - Canine with conventional prepare with palatal chamfer. The prepared specimens will be molded and stone type IV dies will be obtained. Ceramic veneer will be made using a di-silicated based ceramic (IPS.emax. Press, Vicadent Ivoclar, Schaan). The veneers will be cemented adhesively. The specimens will be subjected to mechanical cycling loading (45, 37 ° C, 90 N, 4 Hz) and analyzed at each 500,000 cycle, to observe any type of event (Decementation, tooth fracture, ceramic fracture, ceramic cracks or root cracks). The specimens that survive will be tested for load to fracture. Models identical to those used in the laboratory test will be simulate bi-dimensionally (Rhinoceros 4.0 / Solidworks) and mechanical behavior will be evaluated (MSC and MSC Patran2005r2 Marc.Mentat 2005r2) through the values of Maximum Principal Stress. To analyze the survival rate of the will be used the Kaplan Meier test and possible differences will be analyzed by log-rank test (± = 0,05). The load to fracture values will be analyzed by T-Student test (± = 0,05). (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
BERGOLI, César Dalmolin. Taxa de sobrevida, carga para fratura e análise por elementos finitos de dentes anteriores restaurados com facetas cerâmicas variando o desenho do preparo. 2013. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos São José dos Campos.

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