Morphologic, functional, and occlusal characterization of mandibular lateral displacement malocclusion.
BACKGROUND
Mandibular lateral displacement (MLD) is clinically characterized by deviation of the chin, facial asymmetry, dental midline discrepancy, crossbite in the posterior region, and high prevalence of internal derangement of the temporomandibular joint. Morphologic and functional characteristics of MLD should be clarified to correct and prevent this malocclusion.


METHODS
We examined the morphologic features, occlusal scheme, and functional behavior of MLD in 116 patients. Facial morphology was examined with posteroanterior cephalograms, occlusion guidance on the articulator after face-bow transfer, and condylar movement with the condylograph.


RESULTS
The superiorly inclined occlusal plane was associated with mandibular deviation in the same direction. The posterior occlusal plane on the shifted side was significantly steeper than that on the nonshifted side. Functional analysis of condylar movement showed a close relationship between the direction of MLD and the direction of condylar lateral shift during opening and closing, and protrusion and retrusion. The occlusal guidance inclination in the buccal segment of the nonshifted side was steeper than that in the shifted side.


CONCLUSIONS
The results suggested that reduced vertical height of the dentition on 1 side induced mandibular lateral adaptation with contralateral condylar shift (asymmetry); this leads to condylar lateral shift during functional movement.
Ishizaki
Kyoko
K
Department of Craniofacial Growth and Development Dentistry, Division of Orthodontics, Kanagawa Dental College, Yokosuka, Japan.
Suzuki
Koichi
K
Mito
Tomofumi
T
Tanaka
Eliana Midori
EM
Sato
Sadao
S
D001172:Arthritis, Rheumatoid / Q000473:pathology / Q000503:physiopathology; D001641:Bicuspid / Q000473:pathology; D002508:Cephalometry; D002680:Chin / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D003725:Dental Articulators; D003766:Dental Occlusion; D005146:Facial Asymmetry / Q000473:pathology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D006965:Hyperplasia; D007180:Incisor / Q000473:pathology; D007574:Jaw Relation Record; D008297:Male; D008310:Malocclusion / Q000473:pathology* / Q000503:physiopathology; D008334:Mandible / Q000473:pathology* / Q000503:physiopathology; D008335:Mandibular Condyle / Q000473:pathology / Q000503:physiopathology; D008416:Mastoid / Q000473:pathology; D008963:Molar / Q000473:pathology; D010003:Osteoarthritis / Q000473:pathology / Q000503:physiopathology; D016059:Range of Motion, Articular / Q000502:physiology; D012399:Rotation; D013701:Temporal Bone / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000473:pathology / Q000503:physiopathology; D014716:Vertical Dimension; D055815:Young Adult; D015050:Zygoma / Q000473:pathology