title: Three-dimensional finite element analysis of unilateral mastication in malocclusion cases using cone-beam computed tomography and a motion capture system.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Anatomy, Dankook University College of Medicine, Cheonan, Korea .
authors.forename: Hun-Mu
authors.identifier: 0000-0001-9388-4375
authors.initials: HM
authors.lastname: Yang
authors.affiliation: Department of Orthodontics, Yonsei University College of Dentistry, Seoul, Korea .
authors.forename: Jung-Yul
authors.identifier: 0000-0001-8761-3819
authors.initials: JY
authors.lastname: Cha
authors.affiliation: Perio-Implant Research Center, Dankook University College of Dentistry, Cheonan, Korea .
authors.forename: Ki-Seok
authors.identifier: 0000-0002-8308-585X
authors.initials: KS
authors.lastname: Hong
authors.affiliation: Department of Oral Anatomy, Dankook University College of Dentistry, Cheonan, Korea .
authors.forename: Jong-Tae
authors.identifier: 0000-0002-1672-3671
authors.initials: JT
authors.lastname: Park
keywords: Finite element analysis; Malocclusion; Mastication; Masticatory muscles