Modelling of dynamic behaviour of dental bridge using finite element method

The goal of research is application of dynamic analysis methods in dentofacial biomechanics using polymethylmethacrylate dental bridge as a pilot example. Plane strain formulation is used. Experimental verification is carried out based on results of ceramic dental bridge with identical design. Natural frequencies and Rayleigh damping ratios are determined. Influence of force duration on stresses occurring in dental bridge is investigated. Local areas of maximal equivalent stresses are determined using von Mises criterion. Moreover, the study shows high increase in deformation and stresses (excessing the yield stress) in the case when force duration equal or close to natural period. The results of dynamic analysis tend to results of static analysis in the case of force duration increase. The influence of pulp can be neglected during solving static analysis problems. But, the research approved pulp’s role as a natural shock absorber in the dentofacial system. As a result, consideration of pulp leads to decrease of deformation, stresses, intense energy absorption and oscillation damping.