Interfering factors in the mechanical requirement of adhesive restoration interfaces and solutions to reduce them

• Grant number: 06/00186-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: July 01, 2006
• End date: February 28, 2009
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Rafael Yagüe Ballester
• Grantee: Flávia Pires Rodrigues
• Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The stress generated on different cavity walls and on restored teeth will be evaluated by finite element method in function of the cavity shape, C-factor, type of mechanical loading and the interface adhesion condition. The models will be pre and post-processed by MSC.PATRAN and post processed by MSC.Marc. On a first step, 3D Class I and II stylized cavity models with different geometries and C-factor values, but with constant volume (20 mm3). On a second step, premolar Class I and II models with 20 mm3 will be simulated. For both steps, stresses generated by shrinkage of composites with different modulus into different cavity walls will be compared. Different mechanical loading conditions will also be analyzed: concentrated or uniformly distributed on the restored material and/or on the tooth, with loads of 400N with different application points. Finally, different conditions of perfect adhesion on the interface will be analyzed: throughout the whole interface, on some regions of the interface and lack of adhesion. As early as the model response coherence will be verified, the stress distribution, strain and displacement affered by the program will be compared quantitatively and qualitatively. On the interface, tensile and shear stresses to each wall will be analyzed; on the tooth, the Von Mises and tensile stresses will be analyzed. With the obtained results, it is intended that solutions to minimize stresses could be suggested, either by new convenience shapes or by the restorative materials combination.

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CIDREIRA BOARO, LETICIA CRISTINA; BRANDT, WILLIAM CUNHA; CRUZ MEIRA, JOSETE BARBOSA; RODRIGUES, FLAVIA PIRES; PALIN, WILLIAM M.; BRAGA, ROBERTO RUGGIERO. Experimental and FE displacement and polymerization stress of bonded restorations as a function of the C-Factor, volume and substrate stiffness. Journal of Dentistry, v. 42, n. 2, p. 140-148, FEB 2014. (06/00186-3)

RODRIGUES, FLAVIA P.; LIMA, RAUL G.; MUENCH, ANTONIO; WATTS, DAVID C.; BALLESTER, RAFAEL Y.. A method for calculating the compliance of bonded-interfaces under shrinkage: Validation for Class I cavities. Dental Materials, v. 30, n. 8, p. 936-944, AUG 2014. (06/00186-3)

FURUSE, ADILSON Y.; GORDON, KATHRYN; RODRIGUES, FLAVIA P.; SILIKAS, NICK; WATTS, DAVID C.. Colour-stability and gloss-retention of silorane and dimethacrylate composites with accelerated aging. Journal of Dentistry, v. 36, n. 11, p. 945-952, NOV 2008. (06/00186-3)

RODRIGUES, FLAVIA P.; SILIKAS, NICK; WATTS, DAVID C.; BALLESTER, RAFAEL Y.. Finite element analysis of bonded model Class I `restorations' after shrinkage. Dental Materials, v. 28, n. 2, p. 123-132, FEB 2012. (06/00186-3)

RODRIGUES, FLAVIA P.; SILIKAS, NICK; WATTS, DAVID C.; BALLESTER, RAFAEL Y.. Finite element analysis of bonded model Class I 'restorations' after shrinkage. Dental Materials, v. 28, n. 2, p. 10-pg., 2012-02-01. (06/00186-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

RODRIGUES, Flávia Pires. Factors predicting the shrinkage stress for Class I bonded restorations interface. 2009. Doctoral Thesis - Universidade de São Paulo (USP). Faculdade de Odontologia (FO/SDO) São Paulo.