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Plane-to-plane analysis of mandibular misalignment in patients with facial asymmetry.

Abstract Little is known regarding how the mandible rotates in facial asymmetry. The purpose of this study was to study mandibular misalignment with a new plane-to-plane analysis method in patients with facial asymmetry.
PMID
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Authors

Mayor MeshTerms

Tomography, X-Ray Computed

Keywords
Journal Title american journal of orthodontics and dentofacial orthopedics : official publication of the american association of orthodontists, its constituent societies, and the american board of orthodontics
Publication Year Start




PMID- 29287657
OWN - NLM
STAT- MEDLINE
DCOM- 20180112
LR  - 20180112
IS  - 1097-6752 (Electronic)
IS  - 0889-5406 (Linking)
VI  - 153
IP  - 1
DP  - 2018 Jan
TI  - Plane-to-plane analysis of mandibular misalignment in patients with facial
      asymmetry.
PG  - 70-80
LID - S0889-5406(17)30766-7 [pii]
LID - 10.1016/j.ajodo.2017.05.032 [doi]
AB  - INTRODUCTION: Little is known regarding how the mandible rotates in facial
      asymmetry. The purpose of this study was to study mandibular misalignment with a 
      new plane-to-plane analysis method in patients with facial asymmetry. METHODS:
      Optimal symmetry planes (OSPs) were generated by computing the greatest count of 
      paired voxels on opposing sides of the computerized tomography image of the
      structure. The mandibular OSP was measured against the midfacial OSP for its
      alignment. The deviation angle formed by the 2 OSPs was broken down into a y-axis
      component (frontal deviation angle) and a z-axis component (horizontal deviation 
      angle). Fifty-nine patients who sought correction for facial asymmetry were
      included for study. RESULTS: The new analysis method was feasible. Fifty patients
      (83%) had significant mandibular misalignment (deviation, >/=4 degrees or 4 mm). 
      The locations of the rotational axes exhibited significant variations that could 
      explain the varied features of the asymmetry. The frontal deviation angle (mean, 
      3.80 degrees +/- 3.89 degrees ) was significantly larger than the horizontal
      deviation angle (mean, 2.77 degrees +/- 1.71 degrees ). There was no significant 
      correlation between the horizontal deviation angle and the anterior deviation
      distance or the posterior deviation distance. CONCLUSIONS: Proper mandibular
      realignment was suggested to be the primary aim in surgical correction of most
      jawbone asymmetries. Because of the greatly varied rotational axes and the
      obscure z-axis rotation, realignment could be difficult with the traditional
      approach. The OSP-based analysis is advocated to guide planning.
CI  - Copyright (c) 2017 American Association of Orthodontists. Published by Elsevier
      Inc. All rights reserved.
FAU - Wong, Tung-Yiu
AU  - Wong TY
AD  - Division of Oral and Maxillofacial Surgery, Institute of Oral Medicine and
      Department of Stomatology, National Cheng Kung University Hospital, College of
      Medicine, National Cheng Kung University, Tainan, Taiwan.
FAU - Liu, Jia-Kuang
AU  - Liu JK
AD  - Division of Orthodontics, Institute of Oral Medicine and Department of
      Stomatology, National Cheng Kung University Hospital, College of Medicine,
      National Cheng Kung University, Tainan, Taiwan.
FAU - Wu, Tung-Chin
AU  - Wu TC
AD  - Department of Mechanical Engineering, School of Engineering, National Cheng Kung 
      University Hospital, College of Medicine, National Cheng Kung University, Tainan,
      Taiwan.
FAU - Tu, Yi-Hsuan
AU  - Tu YH
AD  - Department of Statistics, National Cheng Kung University Hospital, College of
      Medicine, National Cheng Kung University, Tainan, Taiwan.
FAU - Chen, Ken-Chung
AU  - Chen KC
AD  - Division of Oral and Maxillofacial Surgery, Institute of Oral Medicine and
      Department of Stomatology, National Cheng Kung University Hospital, College of
      Medicine, National Cheng Kung University, Tainan, Taiwan.
FAU - Fang, Jing-Jing
AU  - Fang JJ
AD  - Department of Mechanical Engineering, School of Engineering, National Cheng Kung 
      University Hospital, College of Medicine, National Cheng Kung University, Tainan,
      Taiwan. Electronic address: [email protected]
FAU - Cheng, Ke-Hsin
AU  - Cheng KH
AD  - Division of Oral and Maxillofacial Surgery, Institute of Oral Medicine and
      Department of Stomatology, National Cheng Kung University Hospital, College of
      Medicine, National Cheng Kung University, Tainan, Taiwan.
FAU - Lee, Jing-Wei
AU  - Lee JW
AD  - Department of Surgery, National Cheng Kung University Hospital, College of
      Medicine, National Cheng Kung University, Tainan, Taiwan.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Am J Orthod Dentofacial Orthop
JT  - American journal of orthodontics and dentofacial orthopedics : official
      publication of the American Association of Orthodontists, its constituent
      societies, and the American Board of Orthodontics
JID - 8610224
SB  - D
SB  - IM
MH  - Cephalometry
MH  - Facial Asymmetry/*diagnostic imaging
MH  - Humans
MH  - Imaging, Three-Dimensional
MH  - Mandible/*diagnostic imaging
MH  - Retrospective Studies
MH  - *Tomography, X-Ray Computed
EDAT- 2017/12/31 06:00
MHDA- 2018/01/13 06:00
CRDT- 2017/12/31 06:00
PHST- 2015/09/01 00:00 [received]
PHST- 2017/05/01 00:00 [revised]
PHST- 2017/05/01 00:00 [accepted]
PHST- 2017/12/31 06:00 [entrez]
PHST- 2017/12/31 06:00 [pubmed]
PHST- 2018/01/13 06:00 [medline]
AID - S0889-5406(17)30766-7 [pii]
AID - 10.1016/j.ajodo.2017.05.032 [doi]
PST - ppublish
SO  - Am J Orthod Dentofacial Orthop. 2018 Jan;153(1):70-80. doi:
      10.1016/j.ajodo.2017.05.032.