Finite element analysis of stress distribution in four different endodontic post systems in a model canine

Abstract

Abstract.To investigate the stress distribution in a maxillary canine restored with each of four different post systems at different levels of alveolar bone loss. Two-dimensional finite element analysis (FEA) was performed by modeling a severely damaged canine with four different post systems: CAD/CAM zirconia, CAD/CAM glass fiber, cast titanium, and cast gold. A force of 100 N was applied to the crown, and the von Mises stresses were obtained. FEA revealed that the CAD/CAM zirconia post system produced the lowest maximum von Mises stress in the dentin layer at 115.8 MPa, while the CAD/CAM glass fiber post produced the highest stress in the dentin at 518.2 MPa. For a severely damaged anterior tooth, a zirconia post system is the best choice while a cast gold post ranks second. The CAD/CAM glass fiber post is least recommended in terms of stress level in the dentin.

Effects of scanning technique on <i>in vitro</i> performance of CAD/CAM-fabricated fiber posts

“…To our knowledge, no previous study has investigated direct scanning of the post space. Several studies used different indirect techniques for digital data acquisition of the post space (23)(24)(25)(26)(27)(28)34). Lee et al scanned stone models of the post space to custom-fabricate the fiber post and core restoration (23,24).…”

“…In a study by Bittner et al (34), acrylic resin patterns were scanned to CAD/ CAM-fabricate a zirconia post and core. The scanning methods used were not specified in recent studies of CAD/CAM glass fiber posts by Chen et al (27,28). In addition, no studies have examined the usefulness of procedures for digital acquisition of the post space.…”

“…Chen et al (26) validated this technique by inserting a 1-piece glass fiber dowel-and-core fabricated with CAD/CAM technology in two patients. Additionally, two recent studies by Chen et al tested von Misses stress level in dentin of extracted maxillary canines restored with CAD/ CAM glass fiber posts and lithium disilicate crowns (27,28). However, few in vitro or in vivo studies have investigated the performance of CAD/CAM-fabricated fiber posts inserted into oval-shaped root canals.…”

“…Digital images of the prepared tooth, which are required for CAD/CAM fabrication of a restoration, can be obtained by direct intraoral scanning, by scanning impressions, or by scanning stone models (25)(26)(27)(28)(29). Impressions and stone replicas can be digitized with high reliability (30).…”

The Stress Distribution Evaluation of Two Different Post Types Which Used in Anterior Teeth With Complicated Crown-Root Fracture: A Finite Element Analysis Method

“…33 However, Chen et al reported that CAD/CAM glass fiber post is produce to stress in dentin, and is least recommended because of stress level. 34 As a result of this study, glass and carbon fiber post were showed homogeneous stress distribution. However, the values of the Von Mises stresses of glass fiber post were found higher than carbon fiber post.…”