Journal article

Publication year: 2016

Pages: 160-167

Journal: Journal of Orofacial Orthopedics

Volume number: 77

Issue number: 3

ISSN: 1434-5293

eISSN: 1615-6714

DOI Link: https://doi.org/10.1007/s00056-016-0020-x

Publisher: Springer

Abstract: 

The purpose of this study was to assess and compare occlusal changes induced by Herbst treatment and the stability of these changes in patients with retrognathic and prognathic facial types.

The sample comprised 11 retrognathic (SNA a parts per thousand currency sign76A degrees, SNB a parts per thousand currency sign72A degrees, ML/NSL a parts per thousand yen36A degrees) and 10 prognathic (SNA a parts per thousand yen83A degrees, SNB a parts per thousand yen80A degrees, ML/NSL a parts per thousand currency sign32A degrees) patients with Class II molar relationships of a parts per thousand yen0.5 cusp widths bilaterally or a parts per thousand yen1.0 cusp width unilaterally. Both groups involved similar distributions of skeletal maturity before treatment. Study parameters were assessed on casts reflecting the situations before treatment (T0), after Herbst treatment (T1), after multibracket treatment immediately following Herbst treatment (T2), and after a mean of 31.1 months of retention (T3).

Sagittal molar relationships improved by 0.8 cusp widths in the retrognathic and by 0.7 cusp widths in the prognathic group during active treatment (T0-T2). Insignificant changes of a parts per thousand currency sign0,2 cusp widths were seen in both groups during retention (T2-T3). Overjet decreased by 8.6 mm in the retrognathic and by 5.5 mm in the prognathic group during T0-T2, and both groups showed clinically irrelevant amounts of relapse by 0.7 mm during T2-T3. Overbite improved by 1.2 mm in the retrognathic and by 2.5 mm in the prognathic group during T0-T2, reaching mean values of 1.0 mm or 1.4 mm by T2, which was followed by 0.2 mm or 1.1 mm of relapse during T2-T3.

Treatment with a Herbst appliance seems to offer stable correction of the sagittal occlusal relationships in Class II patients with retrognathic or prognathic facial types, with the vertical changes being more pronounced in the prognathic cases.

Harvard Citation style: Bock, N., Gnandt, E. and Ruf, S. (2016) Occlusal stability after Herbst treatment of patients with retrognathic and prognathic facial types A pilot study, Journal of Orofacial Orthopedics, 77(3), pp. 160-167. https://doi.org/10.1007/s00056-016-0020-x

APA Citation style: Bock, N., Gnandt, E., & Ruf, S. (2016). Occlusal stability after Herbst treatment of patients with retrognathic and prognathic facial types A pilot study. Journal of Orofacial Orthopedics. 77(3), 160-167. https://doi.org/10.1007/s00056-016-0020-x