Open Access Research Article

Influence of Shoulder and Chamfer Margin Design on the Stress Distribution Pattern in Different All Ceramic Restorations by Three-Dimensional Finite Element Analysis

Imtiyaz Ahmed Magray1, Talib Amin Naqash2*, Shafait Ullah Khateeb3, Mohammad Yunis Saleem Bhat4 and Muhammad Waqar Hussain5

1Department of Prosthetic Dentistry, India

2Department of Prosthetic Dentistry, KSA

3Department of Restorative Dental Science, KSA

4Department of Periodontics and Community Dental Sciences, KSA

5Department of Prosthetic Dentistry, Pakistan

Corresponding Author

Received Date: October 27, 2018;  Published Date: November 15, 2018

Abstract

Purpose: The purpose of this study was to evaluate the influence of shoulder and chamfer margin design on stress distribution pattern in different all ceramic restorations.

Materials and methodology: Six three-dimensional finite element models representing mandibular second premolar tooth were constructed, using a Finite Element Analysis Software (ANSYS version 14; ANSYS Inc., Canonsburg, PA, USA). Three models each with shoulder and chamfer finish line were created after tooth preparation by reverse engineering, using Pro E software. Each model with shoulder finish line margin had Bruxzir (Glidewell labs), Lava (3M ESPEE) and IPS e.max Press (Ivoclar Vivadent) all ceramic restorations fabricated over them. Same was done with the models having chamfer finish margin. A distributed load of 600 N was applied on the restorations to analyze the stress distribution pattern in different all ceramic restorations having different marginal geometry. The stress distribution in different groups was compared using one-way ANOVA and Tukey’s honest significance test.

Result: Von Mises stresses in the margin region were seen to be lowest in Lava (3M ESPEE) all ceramic restoration with shoulder finish margin when subjected to masticatory bite force. The areas of maximum stress concentration were found in the cervical portion of the all ceramic restorations when subjected to loading forces.

Conclusion: The type of material used, and the type of margin configuration affects the stress distribution pattern within posterior all ceramic restorations.

Keywords: Chamfer; Finite element analysis (FEA); Shoulder

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