J Periodontal Implant Sci.  2016 Apr;46(2):96-106. 10.5051/jpis.2016.46.2.96.

Three-dimensional finite element analysis of unilateral mastication in malocclusion cases using cone-beam computed tomography and a motion capture system

• Yang HM
• Cha JY
• Hong KS
• Park JT

• KMID: 2161986
• DOI: http://doi.org/10.5051/jpis.2016.46.2.96

Abstract

PURPOSE
Stress distribution and mandible distortion during lateral movements are known to be closely linked to bruxism, dental implant placement, and temporomandibular joint disorder. The present study was performed to determine stress distribution and distortion patterns of the mandible during lateral movements in Class I, II, and III relationships.
METHODS
Five Korean volunteers (one normal, two Class II, and two Class III occlusion cases) were selected. Finite element (FE) modeling was performed using information from cone-beam computed tomographic (CBCT) scans of the subjects' skulls, scanned images of dental casts, and incisor movement captured by an optical motion-capture system.
RESULTS
In the Class I and II cases, maximum stress load occurred at the condyle of the balancing side, but, in the Class III cases, the maximum stress was loaded on the condyle of the working side. Maximum distortion was observed on the menton at the midline in every case, regardless of loading force. The distortion was greatest in Class III cases and smallest in Class II cases.
CONCLUSIONS
The stress distribution along and accompanying distortion of a mandible seems to be affected by the anteroposterior position of the mandible. Additionally, 3-D modeling of the craniofacial skeleton using CBCT and an optical laser scanner and reproduction of mandibular movement by way of the optical motion-capture technique used in this study are reliable techniques for investigating the masticatory system.

Keyword

Finite element analysis; Malocclusion; Mastication; Masticatory muscles

MeSH Terms

Bruxism
Cone-Beam Computed Tomography*
Dental Implants
Finite Element Analysis*
Incisor
Malocclusion*
Mandible
Mastication*
Masticatory Muscles
Reproduction
Skeleton
Skull
Stomatognathic System
Temporomandibular Joint Disorders
Volunteers
Dental Implants

Figure

• 

  Figure 1 The trajectory of an incisor during lateral movement. (A) The motion of an incisor was captured from the anterior side. (B) The motion of an incisor was captured from the lateral side.

• 

  Figure 2 The reproduction of occlusion contacts (red colored area) at the time of initial contact on both sides during the closing phase of lateral movement. (A) The 3D simulation of lateral movement was performed based on CBCT images and captured motion information. (B) Occlusal contacts were examined on the occlusal aspects of the reconstructed image.

• 

  Figure 3 Stress distribution with simulation of lateral movement with 100, 150, 200 and 225kgf loading force in cases I~V.

• 

  Figure 4 Distortion of mandible with simulation of lateral movement with 100, 150, 200 and 225kgf loading force in cases I~V.

• 

  Figure 5 The maximum distortion of mandible according to the loading force in each case.

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