J Adv Prosthodont.  2013 Aug;5(3):326-332. 10.4047/jap.2013.5.3.326.

Three-dimensional finite element analysis of implant-supported crown in fibula bone model

Affiliations
  • 1Department of Oral Anatomy and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
  • 2Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea. proskwon@snu.ac.kr

Abstract

PURPOSE
The purpose of this study was to compare stress distributions of implant-supported crown placed in fibula bone model with those in intact mandible model using three-dimensional finite element analysis.
MATERIALS AND METHODS
Two three-dimensional finite element models were created to analyze biomechanical behaviors of implant-supported crowns placed in intact mandible and fibula model. The finite element models were generated from patient's computed tomography data. The model for grafted fibula was composed of fibula block, dental implant system, and implant-supported crown. In the mandible model, same components with identical geometries with the fibula model were used except that the mandible replaced the fibula. Vertical and oblique loadings were applied on the crowns. The highest von Mises stresses were investigated and stress distributions of the two models were analyzed.
RESULTS
Overall stress distributions in the two models were similar. The highest von Mises stress values were higher in the mandible model than in the fibula model. In the individual prosthodontic components there was no prominent difference between models. The stress concentrations occurred in cortical bones in both models and the effect of bicortical anchorage could be found in the fibula model.
CONCLUSION
Using finite element analysis it was shown that the implant-supported crown placed in free fibula graft might function successfully in terms of biomechanical behavior.

Keyword

Finite element analysis; Mandibular reconstruction; Hemimandibulectomy; Fibula

MeSH Terms

Crowns
Dental Implants
Fibula
Finite Element Analysis
Mandible
Mandibular Osteotomy
Mandibular Reconstruction
Prosthodontics
Transplants
Dental Implants

Figure

  • Fig. 1 Implant components included in the models. Implant, abutment, abutment screw meshes were generated separately.

  • Fig. 2 Structures of the three-dimensional finite element models. (A) Finite element model of the implant-supported crown placed in mandible model, (B) Finite element model of the implant-supported crown placed in fibula model.

  • Fig. 3 The von Mises stress (GPa) distributions in the finite element models. High concentrations were found in the surface between abutment and implant body. (A) stress distribution in the intact mandible model, (B) stress distribution in the fibula model.

  • Fig. 4 Stress distributions in implant components with 150 N vertical loading. von Mises stress (GPa) distributions were different based on the models, however, their values were similar. (A) stress distributions in implant components of mandible model, (B) stress distributions in implant components of fibula model.

  • Fig. 5 Stress distributions in cancellous and cortical bones. In the fibula model, the effect of bicortical anchorage can be found. (A) stress distributions in the bone of the mandible model with 50 N of vertical loading, (B) stress distributions in the bone of the mandible model with 150 N of vertical loading, (C) stress distributions in the bone of the mandible model with 50 N of oblique loading, (D) stress distributions in the bone of the fibula model with 50 N of vertical loading, (E) stress distributions in the bone of the fibula model with 150 N of vertical loading, (F) stress distributions in the bone of the fibula model with 50 N of oblique loading.


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