FINITE ELEMENT ANALYSIS OF PERIODONTAL STRESSES IN FIXED PROSTHODONTICS

Abstract

Aim The aim of the study is to determine by finite element analysis the existence of direct correlations between the abutment periodontal tissues condition and the cantilever bridge in the context of functional occlusion. Materials and method In order to reveal the changes occurring in the periodontal ligament, a distal dental cantilever bridge was considered, retained on 34 and 35, subjected to a force of 350N, deemed to be the maximum force developed by the masseter and pterygoid muscles during mastication. The ALGOR 15 FEMPRO software was used to analyze the periodontal ligament stress. Results Finite element analysis was employed to determine the stresses, specific deformations and displacements undergone by the ligaments under survey. The maximum stress was recorded in the periodontal ligament of the first premolar since this load configuration produces a first degree lever effect with a fulcrum located on the premolar 35 root apex. Conclusions The overstress of periodontal ligament under occlusal forces leads implicitly to the tearing of the ligament fibers either in their body, or in its insertion into the dentin and bone.

Keywords

• finite element
• dental cantilever bridge
• periodontal stress