Finite Element Analysis of Acrylic Denture Produced from Metal Stock Tray

Nadira Hatim,Ayad Abdul-Razaq,Ibtehal Al-Zubaidy

doi:10.33899/rden.2009.8996

Abstract

Aims: To determine stress analysis exerted by denture on the edentulous alveolar bone in the premolar region represented by stone cast produced from metal stock tray using linear finite element method. Materials and methods: Metal perforated stock tray was used to produce stone cast that represent the denture base and the underlying bone using silicone impression material. The dimension of the cross section of the stone cast was measured using Dimax program, then the data collected was entering Excel program for making the figures. The dimension of the cross section of the stone cast entering finite element program and other new auxiliary program prepared specially for this study for finite element analysis. Results: After the data was analyzed, the results were drawn in figures using surfer 7 program. High compressive, tensile, deflection, shear and maximum principal stress values were observed below the point of force application and in the underlying structure with different values and locations according to the analysis in the mucous membrane and in the underlying bone in the X and Y axes. Conclusions: By using finite element analysis, the more stress concentration and deflection were found below the point of force application, in the mucous membrane, at the beginning of the cortical bone and

Highlights

The material of custom trays should have better dimensional stability and more accuracy to obtain the denture base with less dimensional changes and better stress distribution on the edentulous residual ridge [1,2]
For the finite element method, the stone cast produced from metal perforated stock tray that represent the denture base and the underlying bone was section in the horizontal direction in the premolar region by using fine saw, the dimension of the cross section of stone cast was measured by using Dimax program
A stand held digital camera was placed (60cm) away from the dental surveyor in zero plane that contain the cross section of stone cast produced from metal perforated stock tray, the picture analyzed by entering Dimax program, a ruler was used to detect the accuracy of the measurements, the measurements were done each (2mm) in two dimension

Summary

INTRODUCTION

The material of custom trays should have better dimensional stability and more accuracy to obtain the denture base with less dimensional changes and better stress distribution on the edentulous residual ridge [1,2]. Finite element method is a powerful research tool used to examine complex mechanical behavior of prosthesis and surrounding structures that are other wise difficult to assess. It divides the structure into discrete elements, the elements are connected at points called nodes, elements have the same properties of the structure [3]. Kawasaki et al [4] stated that for a complete denture to function effectively, the denture must be stabilized during mastication They found that maximum stresses were distributed on the alveolar ridge in which the resorption is sever and the distal load produced large compressive stresses on the inclined plane of posterior alveolar ridge. The purpose of this study was to determine stress analysis exerted by denture on the edentulous mandibular alveolar bone in the premolar region represented by stone cast produced from metal stock tray using linear finite element method

MATERIALS AND METHODS

RESULTS

CONCLUSIONS

REFRENCES