A Comparison of the Stress Analysis of an Unrestored and Restored Tooth with Amalgam and Composite Resin

Halil Aykul,Mustafa Toparlı

doi:10.3390/mca10010089

Abstract

Finite element models were developed for an unrestored tooth and restored tooth. The tooth was considered to be in a restored state with amalgam and composite resin on glass-ionomer as the base material. For this study, an axisymmetric model of a maxillary second premolar that included an alveolar bone was used. A load of 200 N at an angle of 45o to the radial axis was applied on the occlusal margin of the tooth. The tooth was assumed isotropic, homogenous and elastic. The authors using FORTRAN 77 prepared all calculation programs. The distributions of radial axial and shear stresses were plotted with length of radial for some critical points.

Highlights

There is an increasing demand for dental restorations that match tooth tissue and bond to tissue effectively, thereby allowing conservative cavity preparation
MATERIALS AND METHODS Axisymmetric finite element model of the maxillary second premolar tooth that included alveolar bone was investigated for analysis of the stress distribution (Fig.1)
Finite element analysis is based on a continuum model in which the material is assumed to be continuous at all levels

Summary

Introduction

There is an increasing demand for dental restorations that match tooth tissue and bond to tissue effectively, thereby allowing conservative cavity preparation. This demand is strongly influenced by aesthetic consideration and by the desirability of avoiding the use of amalgam. To understand the mechanisms responsible of tooth fracture, the stress distribution within restored and unrestored teeth that results from mastication force has been studied extensively. Toparli et al [6] investigated the distribution of stresses restored tooth from the mastication force using three-dimensional finite element method. Arola et al [7] identified differences in the mechanical behaviour of unrestored molar with that of a molar with class II amalgam or composite mesial occlusal distal (MOD) restoration with dentin and enamel bonding.

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