American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics · 2009
Effects of Herbst appliance treatment on temporomandibular joint disc position and morphology: a prospective magnetic resonance imaging study.
Сравнительное исследованиеСтатьяНазвание и аннотация: Перевод в очереди
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Aidar Luís Antônio de Arruda, Dominguez Gladys Cristina, Abrahão Márcio, Yamashita Hélio K, Vigorito Julio W
Аннотация
INTRODUCTION: The objective of this prospective study was to evaluate changes in the position and morphology of the disc in the temporomandibular joint (TMJ) with magnetic resonance imaging (MRI).
METHODS: The subjects were 32 consecutive adolescent patients with Class II Division 1 malocclusion treated with the Herbst appliance. The MRIs were obtained immediately before treatment (T1), 8 to 10 weeks after appliance placement (T2), and 12 months later (T3).
RESULTS: Qualitative evaluation of the MRIs showed that, in 42 (65.62%) of the 64 TMJs, the disc was positioned within normal limits at T1. Because of the advancements caused by the Herbst appliance, a tendency for disc retrusion was observed at T2, but at T3 the disc had returned to normal limits. In 22 TMJs (34.37%), the disc was displaced at T1, and no changes were observed at T3. In most subjects, comparison of the morphology of the disc at T1, T2, and, T3 showed no significant change.
CONCLUSIONS: Herbst therapy does not cause adverse effects on the morphology and position of the articular disc in the short term.
METHODS: The subjects were 32 consecutive adolescent patients with Class II Division 1 malocclusion treated with the Herbst appliance. The MRIs were obtained immediately before treatment (T1), 8 to 10 weeks after appliance placement (T2), and 12 months later (T3).
RESULTS: Qualitative evaluation of the MRIs showed that, in 42 (65.62%) of the 64 TMJs, the disc was positioned within normal limits at T1. Because of the advancements caused by the Herbst appliance, a tendency for disc retrusion was observed at T2, but at T3 the disc had returned to normal limits. In 22 TMJs (34.37%), the disc was displaced at T1, and no changes were observed at T3. In most subjects, comparison of the morphology of the disc at T1, T2, and, T3 showed no significant change.
CONCLUSIONS: Herbst therapy does not cause adverse effects on the morphology and position of the articular disc in the short term.
Предметные рубрики MeSH
AdolescentChildFemaleFollow-Up StudiesHumansJoint DislocationsLongitudinal StudiesMagnetic Resonance ImagingMaleMalocclusion, Angle Class IIMandibular AdvancementOrthodontic Appliances, FunctionalProspective StudiesRange of Motion, ArticularRetrognathiaTemporomandibular JointTemporomandibular Joint DiscTemporomandibular Joint Disorders