Abstract
INTRODUCTION: Prognosis is the main limitation of interceptive treatment of Class III malocclusions. The interceptive procedures of rapid maxillary expansion (RME) and face mask therapy performed in early mixed dentition are capable of achieving immediate overcorrection and maintenance of facial and occlusal morphology for a few years. Individuals presenting minimal acceptable faces at growth completion are potential candidates for compensatory orthodontic treatment, while those with facial involvement should be submitted to orthodontic decompensation for orthognathic surgery. OBJECTIVES: To investigate cephalometric variables that might predict the outcomes of orthopedic treatment with RME and face mask therapy (FM). METHODS: Cephalometric analysis of 26 Class III patients (mean age of 8 years and 4 months) was performed at treatment onset and after a mean period of 6 years and 10 months at pubertal growth completion, including a subjective facial analysis. Patients was divided into two groups: success group (21 individuals) and failure group (5 individuals). Discriminant analysis was applied to the cephalometric values at treatment onset. Two predictor variables were found by stepwise procedure. RESULTS: Orthopedic treatment of Class III malocclusion may have unfavorable prognosis at growth completion whenever initial cephalometric analysis reveals increased lower anterior facial height (LAFH) combined with reduced angle between the condylar axis and the mandibular plane (CondAx.MP). CONCLUSION: The results of treatment with RME and face mask therapy at growth completion in Class III patients could be predicted with a probability of 88.5%.
Highlights
Prognosis is the main limitation of interceptive treatment of Class III malocclusions
Treatment of Class III malocclusions is limited in its prognosis[1,2,3,4] which is usually complicated in cases of skeletal malocclusion with genetic determination.[5,6]
Shapiro-Wilk test showed that all variables were normally distributed, except for: Co-Pog, Co-Goi, Goi-Pog, palatal plane (PP).stable basicranial line (SBL), CoA and Co-Gn
Summary
Prognosis is the main limitation of interceptive treatment of Class III malocclusions. Treatment of Class III malocclusions is limited in its prognosis[1,2,3,4] which is usually complicated in cases of skeletal malocclusion with genetic determination.[5,6] Subjects with malocclusion resulting from sagittal plane imbalance between the maxilla and the mandible are referred to as Class III malocclusion patients This pattern includes subjects with maxillary retrusion and/or mandibular prognathism,[7,8] regardless of the molar relationship established between dental arches.[5,6,7,9,10] malocclusion tends to present a Class III molar relationship, it does not always express association with the severity of skeletal relationship[6] and, as a consequence, with facial balance. Such uncertainties go beyond occlusal relationships and may compromise facial balance
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