INVESTIGADORES
OLLER  Sergio Horacio Cristobal
congresos y reuniones científicas
Título:
NUMERICAL FINITE ELEMENTS ANALYSIS OF FRICTION DURING HUMAN DENTAL OCCLUSAL CONTACT
Autor/es:
F. BASTOS; E. B. LAS CASAS; S. OLLER
Reunión:
Congreso; XXIX CILAMCE - Iberian Latin American Congress on Computational Methods in Engineering; 2008
Resumen:
This work is part of an ongoing study of human dental wear mechanisms, a relevantproblem in Dentistry, whose study is still quite limited. The development of a numerical model for analysis of the occlusal contact with friction between two antagonistic teeth is considered in order to compare the results with the experimental findings described in the literature. The proposed method includes three basic steps: the characterization of the surface roughness, their homogenization using an assumed distribution function and the numerical analysis of the resulting forces. The first step was performed by contact profilometry tests on an extracted third molar tooth sample in good conservation conditions. The selected superficial texture parameters represented the quadratic average of the heights, slopes and curvature of the asperities, and the peak density. With these parameters, elementary statistics was used to know the probability function of height. Then, the interface was considered as the composition of several areas, each one characterized by a homogeneous distribution of a single type of roughness (a cosine hill, whose amplitude and frequency were determined by the probability funcion) and the interaction between two of those areas can be studied through modeling the contact of each asperities pair. It means that a micro and macro-mechanic approach is used, combining the finite elements strain analysis of the main different asperities with a statistical combination to add the contribution of the response proceeding from each micro-contact, deriving the predicted macroscopic behavior of the interface. The contact is modeled assuming that it occurs in the slopes of asperities.The resulting force is decomposed in the normal and tangential global directions and thesum of these components is taken. The relationship between the normal and tangential resultant forces results on the predicted friction coefficient, which should be validated with values in the literature.