Virtual analysis of stresses in human teeth restored with esthetic posts

Martha Vasconcellos Amarante,Marcos Venicius Soares Pereira,Arnaldo Freitas Camarão,Fathi Aref Ibrahim Darwish

doi:10.1590/s1516-14392008000400014

Martha Vasconcellos Amarante, Marcos Venicius Soares Pereira + Show 2 more

Open Access

https://doi.org/10.1590/s1516-14392008000400014

Copy DOI

Abstract

The use of intra-radicular posts for rebuilding of damaged teeth is a normal practice in contemporary dentistry. However, dental roots restored with posts are subjected to the risk of failure under occlusal loads, particularly in cases of small dentin thickness. This study adopted the finite element analysis to compare the elastic stress distribution in simulated endodontically treated maxillary central incisor restored with two different esthetic posts, a ceramic post and a prefabricated fiber glass post. Under masticatory load, the shear stress and von Mises equivalent stress were determined for the different regions of the two models. The results demonstrated that stress concentrations occurred mainly in the cervical dentin in the prefabricated fiber glass post model. The ceramic post model presented stress concentration in a region limited to the proper post adjacent to its apical end, thus preserving the root dentin.

Highlights

Contemporary restorative dentistry has the main purpose of rehabilitating the function and esthetic of teeth which had their structure severely degraded due to caries or fracture
The present study had evaluated the stress distribution in a maxillary central incisor restored with two different esthetic posts by means of a finite elements analysis
The restoration geometry and the elastic moduli of the materials involved in the process can influence the stress distribution pattern developed in the restored tooth under occlusal loads;

Summary

Introduction

Contemporary restorative dentistry has the main purpose of rehabilitating the function and esthetic of teeth which had their structure severely degraded due to caries or fracture. Research works[7,8,9,10,11,12,13] related to the biomechanics of dental materials have been carried out to evaluate the effect of masticatory loads on the stress distribution within endodontically treated teeth restored with intra-radicular posts. This allows one to pinpoint highly stressed regions where fracture is expected to initiate. As the extensive loss of root dentin increases the risk of radicular fracture, appropriate mechanical behavior of the post is considered, in this case, to be fundamental to the success of rehabilitating restored teeth[20]

Methods

Results

Discussion

Conclusion