Influence of Width, Material Type and Layer Thickness of Adhesive on Stress Distribution in Second Molar Restoration by Finite Element Method

doi: 10.14456/mijet.2022.35

Abstract

The objective of this study was to measure the effect of material type, layer thickness of adhesive, and width of restoration in the second molar to stress distribution and maximum stress at three positions: enamel, restoration and adhesive layer. The model had two types of material (Amalgam and Composite-resin). Each material had three thicknesses of adhesive (100, 200 and 300 µm) and three widths of restoration (2, 3 and 4 mm), to summarize there were 18 models. The model had a depth of the cavity of 2 mm and the base radius of the cavity was 0.5 mm. Three mechanical loads of 100 N (total of 300 N.), were applied on three occlusal contact points on the crown. This research was analyzed by using von Mises stress on enamel, restoration and adhesive layer. The results of this study were that with forces at three points, the maximum stress in the second molars, with restoration adhesive thicknesses of 100, 200 and 300 µm, were equal to 476.46, 462.80 and 309.01 MPa, respectively, while the width of the restoration was 4 mm and it was Amalgam material. All three models had the maximum stress distribution on the same restoration layer. The width of the restoration and the type of material affected the maximum stress in the molar teeth, but the thickness of the adhesive layer had little or no effect on the maximum stress in the molar teeth. In conclusion, the occlusal forces that occur at the junction of the enamel, material and adhesive layer had higher stress than in the other areas, so for safety and to reduce damage avoid grinding the dentin in this area.