Occlusal force and condylar motion in patients with anterior open bite.
Patients with open bite often show a weak occlusal force and temporomandibular disorders (TMDs). If these are the main cause of open bite, it may be hypothesized that both pre-pubertal and adult open-bite patients would show a weak occlusal force and abnormal condylar motion. The purpose of this study was to test this hypothesis. Test group subjects consisted of 13 consecutive pre-pubertal and 13 adult patients with anterior open bite. They were compared with age-matched normal subjects. The adult open-bite group showed a weaker occlusal force and a shorter range of condylar motion compared with the control subjects. In the pre-pubertal subjects, however, there were no significant differences in the occlusal force and range of condylar motion between the open-bite and control groups. Therefore, these results suggest that a weak occlusal force or TMDs may not be the main cause of open bite.
Miyawaki
S
S
Department of Orthodontics and Dentofacial Orthopedics, Okayama University Graduate School of Medicine and Dentistry, 2-5-1, Shikata-cho, Okayama, 700-8525, Japan.
Araki
Y
Y
Tanimoto
Y
Y
Katayama
A
A
Fujii
A
A
Imai
M
M
Takano-Yamamoto
T
T
D000293:Adolescent; D000328:Adult; D001732:Bite Force; D002508:Cephalometry; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000502:physiology; D016555:Matched-Pair Analysis; D024343:Open Bite / Q000150:complications / Q000503:physiopathology*; D016059:Range of Motion, Articular / Q000502:physiology*; D013704:Temporomandibular Joint / Q000502:physiology* / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000209:etiology / Q000503:physiopathology*