title: Features in subjects with the frontal occlusal plane inclined toward the contralateral side of the mandibular deviation.
abstract: BACKGROUND
  The frontal occlusal plane of the maxilla generally inclines toward the ipsilateral side of the mandibular deviation in subjects with facial asymmetry; however, a few patients with facial asymmetry have their frontal occlusal planes inclined toward the contralateral side. We aimed to investigate the morphologic and functional features of such patients.
  
  
  METHODS
  The subjects were 40 patients with facial asymmetry divided into 2 groups based on the inclination of the frontal occlusal plane toward the ipsilateral or the contralateral side. We analyzed lateral and posteroanterior cephalometric radiographs and occlusal variables and evaluated temporomandibular joint symptoms. Statistical comparisons were performed between the 2 groups (P <0.05).
  
  
  RESULTS
  The posteroanterior cephalometry significantly differed between the ipsilateral and contralateral groups. Occlusal force and occlusal contact area were significantly larger, and temporomandibular joint symptoms were more frequently found on the side of the upward-inclined frontal occlusal plane than on the opposite side in both groups.
  
  
  CONCLUSIONS
  The features in the contralateral group in terms of occlusal force and temporomandibular disorders were clinically significant. Clinicians should note that the conditions associated with the contralateral group require less presurgical decompensation.
authors.affiliation: Graduate research student, Orthodontic Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Uesugi
authors.affiliation: Assistant professor, Orthodontic Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. Electronic address: yoneman.orts@tmd.ac.jp.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Yonemitsu
authors.affiliation: Assistant professor, Orthodontic Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kokai
authors.affiliation: Part-time lecturer, Orthodontic Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Maki
authors.initials: M
authors.lastname: Takei
authors.affiliation: Associate professor, Department of Oral and Maxillofacial Surgery, Yokohama City University Medical Center, Yokohama, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Omura
authors.affiliation: Professor, Orthodontic Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Ono
mesh_terms: D000328:Adult; D001732:Bite Force; D002508:Cephalometry / Q000379:methods*; D004396:Coloring Agents; D003766:Dental Occlusion; D005146:Facial Asymmetry / Q000473:pathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007574:Jaw Relation Record / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000473:pathology*; D008437:Maxilla / Q000473:pathology; D011312:Pressure; D011378:Prognathism / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis; D055815:Young Adult
chemical_list: D004396:Coloring Agents