J Korean Acad Conserv Dent.  2009 Jul;34(4):324-332. 10.5395/JKACD.2009.34.4.324.

Finite element analysis of maxillary central incisors restored with various post-and-core applications

• Seo M
• Shon W
• Lee W
• Yoo HM
• Cho BH
• Baek SH

• KMID: 2176161
• DOI: http://doi.org/10.5395/JKACD.2009.34.4.324

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.

Keyword

Post and Core; Finite element analysis; Zirconia ceramic post; Glass fiber post

MeSH Terms

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
Ceramics
Composite Resins
Stainless Steel
Zirconium

Figure

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  Figure 1 3-D finite element model of Maxillary central incisor.

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  Figure 2 llumination of ferrule height and post space

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  Figure 3 Load application.

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  Figure 4 Distribution of von Mises stresses (MPa) in bucco-lingual section. a. Model 1, b. Model 2, and c. Model 3, d. Model 4, e. Model 5, and f. Model 6. Dark blue to red colors represent stress values from lower to higher, respectively

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  Figure 5 Distribution of hydrostatic pressure (MPa) in bucco-lingual section. a Model 1, b Model 2, and c Model 3, d Model 4, e Model 5, and f Model 6. The blue color indicates the area is under tensile force and the red color indicates the area is under compressive force.

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