Finite element analysis of maxillary central incisors restored with various post-and-core applications.
10.5395/JKACD.2009.34.4.324
- Author:
Minseock SEO
1
;
Wonjun SHON
;
Woocheol LEE
;
Hyun Mi YOO
;
Byeong Hoon CHO
;
Seung Ho BAEK
Author Information
1. Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Korea. shbaek@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Post and Core;
Finite element analysis;
Zirconia ceramic post;
Glass fiber post
- MeSH:
Axis, Cervical Vertebra;
Ceramics;
Composite Resins;
Crowns;
Dental Pulp Cavity;
Dentin;
Displacement (Psychology);
Elastic Modulus;
Finite Element Analysis;
Glass;
Hydrostatic Pressure;
Incisor;
Periodontal Ligament;
Psychological Techniques;
Stainless Steel;
Tooth;
Zirconium
- From:Journal of Korean Academy of Conservative Dentistry
2009;34(4):324-332
- CountryRepublic of Korea
- Language:English
-
Abstract:
The purpose of this study was to investigate the effect of rigidity of post core systems on stress distribution by the theoretical technique, finite element stress-analysis method. Three-dimensional finite element models simulating an endodontically treated maxillary central incisor restored with a zirconia ceramic crown were prepared and 1.5 mm ferrule height was provided. Each model contained cortical bone, trabecular bone, periodontal ligament, 4 mm apical root canal filling, and post-and-core. Six combinations of three parallel type post (zirconia ceramic, glass fiber, and stainless steel) and two core (Paracore and Tetric ceram) materials were evaluated, respectively. A 50 N static occlusal load was applied to the palatal surface of the crown with a 60degrees angle to the long axis of the tooth. The differences in stress transfer characteristics of the models were analyzed. von Mises stresses were chosen for presentation of results and maximum displacement and hydrostatic pressure were also calculated. An increase of the elastic modulus of the post material increased the stress, but shifted the maximum stress location from the dentin surface to the post material. Buccal side of cervical region (junction of core and crown) of the glass fiber post restored tooth was subjected to the highest stress concentration. Maximum von Mises stress in the remaining radicular tooth structure for low elastic modulus resin core (29.21 MPa) was slightly higher than that for high elastic modulus resin core (29.14 MPa) in case of glass fiber post. Maximum displacement of glass fiber post restored tooth was higher than that of zirconia ceramic or stainless steel post restored tooth.
