RESUMEN

OBJECTIVE: To investigate the effects of the standard (Class II) Balters bionator in growing patients with Class II malocclusion with mandibular retrusion by using morphometrics (thin-plate spline [TPS] analysis). MATERIALS AND METHODS: Thirty-one Class II patients (17 male and 14 female) were treated with the Balters bionator (bionator group). Mean age at the start of treatment (T0) was 10.3 years, while it was 13 years at the end of treatment (T1). Mean treatment time was 2 years and 2 months. The control group consisted of 22 subjects (14 male and 8 female) with untreated Class II malocclusion. Mean age at T0 was 10.2 years, while it was 12.2 years at T1. The observation period lasted 2 years on average. TPS analysis evaluated statistical (permutation tests) differences in the craniofacial shape and size between the bionator and control groups. RESULTS: Through TPS analysis (deformation grids) the bionator group showed significant shape changes in the mandible that could be described as a mandibular forward and downward displacement. The control group showed no statistically significant differences in the correction of Class II malocclusion. CONCLUSIONS: Bionator appliance is able to induce significant mandibular shape changes that lead to the correction of Class II dentoskeletal disharmony.

Asunto(s)

RESUMEN

O objetivo deste estudo foi avaliar as alterações dentárias ocorridas durante a terapia de expansão rápida da maxila e máscara facial reversa em indivíduos com má oclusão classe III de Angle. A amostra consistiu de 14 indivíduos (9 do sexo feminino e 5 do masculino), com más oclusões de classe III esqueléticas e dentárias, com dentição decídua, mista e permanente. A duração do tratamento completo foi de aproximadamente 11 meses. Os dados obtidos antes e depois do tratamento foram avaliados pelo teste de hipóteses T-Student, para amostras emparelhadas, com nível de significância de 5%. Não foram encontradas alterações angulares estatisticamente significantes em nenhum dos dentes observados (incisivos centrais, caninos e primeiros molares superiores), apesar de ocorrerem alterações significantes lineares nos primeiros molares e caninos. A terapia ERM seguida de MFR mostrou-se eficiente na normalização anteroposterior dos caninos e primeiros molares superiores, sem causar indesejável anteroinclinação dos incisivos centrais superiores

The purpose of this study was to evaluate dental movements after rapid maxillary expansion and facemask therapy in subjects with Class III malocclusion. The sample consisted of 14 subjects with skeletal and dental Class III malocclusion in the deciduous, mixed and permanent dentition (9 female and 5 male). The average treatment period was approximately 11 months. The data before and after the treatment were evaluated using the Student’s t-test for paired samples with a 5% significance level. There were no statistically significant angular changes in any of the observed teeth (central incisors, canines and first molars), despite significant changes in the linear first molars and canines. The rapid maxillary expansion therapy followed by an facial mask FM was efficient for the standardization of the anterior-posterior canines and first molars without causing an undesirable anterior inclination of the upper central incisors

Asunto(s)