Niko Bock1, Hans Pancherz. 1. Department of Orthodontics, University of Giessen, Giessen, Germany. niko.c.bock@dentist.med.uni-giessen.de
Abstract
OBJECTIVE: The aim of this retrospective pilot study was to analyze and compare the short-term and long-term changes of Herbst treatment in Class II division 1 subjects of the retrognathic and prognathic facial type. MATERIALS AND METHODS: The subject material comprised 10 retrognathic (mean SNA = 74.5 degrees, SNB = 70.4 degrees, ML/NSL = 41.1 degrees) and 16 prognathic (mean SNA = 86.7 degrees, SNB = 81.5 degrees, ML/NSL = 25.1 degrees) Class II division 1 subjects treated with the Herbst appliance for an average period of 7 months. Lateral head films from before (T1), immediately after (T2), 12 months after (T3), and 39 months after (T4) Herbst treatment were analyzed with the SO-analysis (analysis of changes in sagittal occlusion) and standard cephalometrics. RESULTS: During the treatment period (T2-T1) the two facial type groups showed similar favorable changes for all variables. During the posttreatment periods of 12 months (T3-T2) and 39 months (T4-T2) recovering changes occurred. In the long-term, a tendency of more unfavorable growth changes was stronger (not significant) for retrognathic subjects than for prognathic subjects. CONCLUSION: On a long-term basis, retrognathic subjects are prone to exhibit more unfavorable mandibular growth changes than prognathic subjects and, thus, might exhibit a greater risk for an occlusal relapse when a stable Class I occlusion is not attained after treatment.
OBJECTIVE: The aim of this retrospective pilot study was to analyze and compare the short-term and long-term changes of Herbst treatment in Class II division 1 subjects of the retrognathic and prognathic facial type. MATERIALS AND METHODS: The subject material comprised 10 retrognathic (mean SNA = 74.5 degrees, SNB = 70.4 degrees, ML/NSL = 41.1 degrees) and 16 prognathic (mean SNA = 86.7 degrees, SNB = 81.5 degrees, ML/NSL = 25.1 degrees) Class II division 1 subjects treated with the Herbst appliance for an average period of 7 months. Lateral head films from before (T1), immediately after (T2), 12 months after (T3), and 39 months after (T4) Herbst treatment were analyzed with the SO-analysis (analysis of changes in sagittal occlusion) and standard cephalometrics. RESULTS: During the treatment period (T2-T1) the two facial type groups showed similar favorable changes for all variables. During the posttreatment periods of 12 months (T3-T2) and 39 months (T4-T2) recovering changes occurred. In the long-term, a tendency of more unfavorable growth changes was stronger (not significant) for retrognathic subjects than for prognathic subjects. CONCLUSION: On a long-term basis, retrognathic subjects are prone to exhibit more unfavorable mandibular growth changes than prognathic subjects and, thus, might exhibit a greater risk for an occlusal relapse when a stable Class I occlusion is not attained after treatment.
Authors: Alexa Helena Kohler Moresca; Nathaly Dias de Moraes; Francielle Topolski; Carlos Flores-Mir; Alexandre Moro; Ricardo Cesar Moresca; Gisele Maria Correr Journal: Angle Orthod Date: 2020-07-01 Impact factor: 2.079
Authors: Paula Loureiro Cheib; Lucia Helena Soares Cevidanes; Antonio Carlos de Oliveira Ruellas; Lorenzo Franchi; Wagner Fernando Moyses Braga; Dauro Oliveira; Bernardo Quiroga Souki Journal: Turk J Orthod Date: 2016-06-01