Herbst appliance therapy and temporomandibular joint disc position: a prospective longitudinal magnetic resonance imaging study

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
Luís Antônio de Arruda AidarGladys Cristina Dominguez

Abstract

The objective of this prospective study was to verify changes in the position of the temporomandibular joint (TMJ) disc by means of magnetic resonance images (MRIs) in adolescent patients treated with the Herbst appliance. Twenty consecutive Class II Division 1 patients treated with Herbst appliances were selected for the study. MRIs were analyzed at 3 stages: immediately before Herbst treatment (T1), 8 to 10 weeks after appliance placement (T2), and at the end of the 12-month Herbst treatment, immediately after appliance removal (T3). Class I or overcorrected Class I dental-arch relationships were observed after Herbst therapy. The qualitative evaluation showed that each patient had the disc within normal limits at T1. At T2, a slight tendency toward disc retrusion because of mandibular advancement was observed, but, at T3, the disc returned to normal, similar to T1 values. By using a quantitative evaluation, parasagittal MRIs (central, medial, and lateral slices) of the TMJs showed that there was no change of disc position from T1 to T3, except in the central slice, which had a retrusive position of the articular disc at T3. During the 12-month period of Herbst appliance treatment, mild changes in the position of the disc occ...Continue Reading

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Citations

Jun 29, 2010·The Angle Orthodontist·Luís Antônio de Arruda AidarMárcio Abrahão
Nov 5, 2011·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Aynur ArasIsil Aras
Aug 5, 2009·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Marcia MasiLuís Antônio de Arruda Aidar
Oct 28, 2008·Orthodontics & Craniofacial Research·N WadhawanR Sharma
Aug 17, 2019·Orthodontics & Craniofacial Research·Paula Loureiro Cheib VilefortBernardo Quiroga Souki

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