J Periodontal Implant Sci.  2015 Feb;45(1):8-13. 10.5051/jpis.2015.45.1.8.

A three-dimensional finite element analysis of the relationship between masticatory performance and skeletal malocclusion

Affiliations
  • 1Department of Periodontology, Dankook University College of Dentistry, Cheonan, Korea.
  • 2Department of Orthodontics, Yonsei University College of Dentistry, Seoul, Korea.
  • 3Department of Oral Anatomy, Dankook University College of Dentistry, Cheonan, Korea. jongta2@dankook.ac.kr

Abstract

PURPOSE
The aim of this study was to evaluate the transfer of different occlusal forces in various skeletal malocclusions using finite element analysis (FEA).
METHODS
Three representative human cone-beam computed tomography (CBCT) images of three skeletal malocclusions were obtained from the Department of Orthodontics, Yonsei University Dental Hospital, Seoul, South Korea. The CBCT scans were read into the visualization software after separating bones and muscles by uploading the CBCT images into Mimics (Materialise). Two separate three-dimensional (3D) files were exported to visualize the solid morphology of skeletal outlines without considering the inner structures. Individual dental impressions were taken and stone models were scanned with a 3D scanner. These images were integrated and occlusal motions were simulated. Displacement and Von Mises stress were measured at the nodes of the FEA models. The displacement and stress distribution were analyzed. FEA was performed to obtain the 3D deformation of the mandibles under loads of 100, 150, 200, and 225 kg.
RESULTS
The distortion in all three skeletal malocclusions was comparable. Greater forces resulted in observing more distortion in FEA.
CONCLUSIONS
Further studies are warranted to fully evaluate the impact of skeletal malocclusion on masticatory performance using information on muscle attachment and 3D temporomandibular joint movements.

Keyword

Computer simulation; Finite element analysis; Malocclusion

MeSH Terms

Bite Force
Computer Simulation
Cone-Beam Computed Tomography
Finite Element Analysis*
Humans
Korea
Malocclusion*
Mandible
Muscles
Orthodontics
Seoul
Temporomandibular Joint

Figure

  • Figure 1 Dental modeling procedures used in this study. Cone-beam computed tomography (CT) images were obtained and integrated with three-dimensional (3D) information scanned from the dental model.

  • Figure 2 Three-dimensional reconstruction of human skull cone-beam computed tomography images from three representative individuals with skeletal malocclusions of classes I, II, and III. (A) Frontal views of three individuals. (B) Lateral views of three individuals with distinctive occlusal relationships.

  • Figure 3 Three-dimensional reconstructions of these images were produced with a surface triangularization technique. The mechanical properties assigned are shown in the figure.

  • Figure 4 Pattern of Von Mises stress and maximum part deflection (URES; mm). Color-coded areas indicate the amount of distortion as shown in the inset index bar.


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