BIOMECHANICS OF CLASS I RESTORATIONS AS A FUNCTION OF THE CAVITY VOLUME AND THE USEFUL VOLUME OF THE RESTORATIVE MATERIAL

• Grant number: 10/19168-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): June 01, 2011
• Effective date (End): May 31, 2012
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Flávia Pires Rodrigues
• Grantee: Carolina Sant'Ana e Silva
• Host Institution: Pró-Reitoria Acadêmica. Universidade Bandeirantes (UNIBAN). São Paulo , SP, Brazil

Abstract

The purpose of this study is to investigate the factors influencing the stress state in cavities restored with composites when subjected to shrinkage, based on the cavity volume and the useful volume of the restorative material. Finite element models will be obtained from a previous master-model. These models will be subjected to computer proceedings which will allow the construction of Class I cavities from the same tooth, with different restoration sizes and shapes(width and depth, progressivaly invasive), by using the MSC.PATRAN (MSC. Software). The analysis will be linear-elastic and structural. For all models, the base nodes will be fixed in all directions (X,Y and Z) and the simulation of the shrinkage will be done by thermal analogy. All materials will be considered as being linear, elastic, isotropic and homogeneous. Cavity volumes and useful volume of the resin-composites will be calculated for all cavities from the highest stress regions.The models will be analyzed with MSC.Marc (MSC.Software) and subsequently analyzed with MSC.PATRAN (MSC. Software) to register maximum principal stress (MP) and the maximum shear stress (MS),and maximum strain (MD) generated at the cavity walls, as a function of the cavity volume and the useful volume of the restorative material. From these results, this is expected that it can be possible to purpose modes to minimize the stress at the Class I cavity walls, when restored with composite.