Factorial analysis of variables influencing mechanical characteristics of a post used to restore a root filled premolar using the finite element stress analysis combined with the Taguchi method

Abstract

Bone-H was the predominant factor influencing the stress of the dentine on a post-restored root filled tooth, followed by the Post-D, Post-L and Ferrule-H. For patients with severe periodontal bone loss, a large post-diameter is essential for endodontic post-restoration treatment.

Influence of restorative procedures on endodontically treated premolars: Finite element analysis of a CT-scan based three-dimensional model

“…It is possible that the post decreases cuspal deflection 1) by absorbing a certain amount of occlusal loads, which could on the long run reduce marginal leakage and infiltration 30) . Most FEA studies published on the topic of postendodontic restorations investigated the influence of post material, length and diameter on the biomechanical properties of endodontically treated teeth restored with prosthodontic crowns 7,[32][33][34] . Therefore, it is difficult to compare the results of this FEA study to the information in the available literature.…”

“…Firstly, homogeneous, linear elastic and isotropic properties were assigned to all the tooth tissues and restorative materials, while it is well known that some of these structures have neither of these properties 38,39) . The nonisotropic properties of the periodontal ligament (PDL) have especially been debated in literature 33) . However, it was found that the properties of the PDL do not influence significantly the validity nor the results of the FEA studies 40) .…”

“…Hence, their results are assumed to be more accurate. However, these types of studies are still very variable, and should be more standarized in order to make comparable results 33,43) . Another important point to be discussed is the choice of von Mises stress criterion in the present study.…”

“…Von Mises criterion is a scalar stress measure which combines the three principal stress values and identifies clearly the areas of the model that are under highest stress and are concequently more prone to fatigue failure. It is widely used in FEA studies 44) , including a large number of published studies on the present topic 7,10,11,32,33,36,37) . Hence, the authors have chosen this criterion as to easily compare results with other studies.…”

Influence of diameter and intraradicular post in the stress distribution. Finite element analysis

“…Furthermore, the increase in the diameter of the retainers was only 0.2 mm (diameter # 1 to # 2). In situations where the dentin structure exhibits greater wear (more than 0.2 mm), it would be necessary to use a post with a larger diameter, and this could directly influence the stress distribution 22 .…”