Changes in temporomandibular joint disc position and form following Herbst and fixed orthodontic treatment

Changes in temporomandibular joint disc position and form following Herbst and fixed orthodontic treatment

Author Aidar, Luis Antonio de Arruda Google Scholar
Dominguez, Gladys Cristina Autor UNIFESP Google Scholar
Yamashita, Helio Kiitiro Autor UNIFESP Google Scholar
Abrahão, Marcio Autor UNIFESP Google Scholar
Institution Univ Santa Cecilia
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Objective: To determine the changes in the position and form of the temporomandibular joint articular disc in adolescents with Class II division 1 malocclusion and mandibular retrognathism treated with the Herbst appliance (phase I) and fixed orthodontic appliance (phase II).Materials and Methods: Thirty-two consecutive adolescents went through phase I of treatment and 23 completed phase II. the temporomandibular joints were evaluated qualitatively by means of magnetic resonance images at the beginning of treatment (T1), during phase I (T2), at the end of phase I (T3), and at the end of phase II (T4).Results: Significant changes in disc position were not observed with the mouth closed between T1 X T3 (P = .317), T3 X T4 (P = .287), or T1 X T4 (P = .261). At T2, on average, the disc was positioned regressively. With the mouth open, no difference was observed between T1 X T3 (P = .223) or T1 X T4 (P = .082). We did observe a significant difference between T3 X T4 (P < .05). Significant changes in the disc form were found with the mouth closed between T1 X T2 (P < .001) and T2 X T3 (P < .001).Conclusions: At the end of the two-phase treatment, in general terms, the position and form of the initial articular discs were maintained; however, in some temporomandibular joints some seemingly adverse effects were observed at T4. (Angle Orthod. 2010;80:843-852.)
Keywords Temporomandibular joint
Magnetic resonance
Angle Class II malocclusion
Herbst therapy
Language English
Date 2010-09-01
Published in Angle Orthodontist. Newton N: E H Angle Education Research Foundation, Inc, v. 80, n. 5, p. 843-852, 2010.
ISSN 0003-3219 (Sherpa/Romeo, impact factor)
Publisher E H Angle Education Research Foundation, Inc
Extent 843-852
Origin http://dx.doi.org/10.2319/093009-545.1
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000281471900008
URI http://repositorio.unifesp.br/handle/11600/32857

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