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Effectiveness of bionator therapy for Class II malocclusions: a comparative long-term study
J Kochel1, P Meyer-Marcotty, E Witt
1Department of Orthodontics, Dental Clinic of Medical Faculty, Julius Maximilian University, Pleicherwall 2, 97070, Würzburg, Germany. Kochel_J@klinik.uni-wuerzburg.de
Summary
Bionator therapy effectively corrects Class II malocclusions in both Angle Class II, Division 1 and Division 2 patients, showing significant skeletal changes and stable long-term results with no significant mandibular compensation.
Area of Science:
- Orthodontics
- Craniofacial Biology
- Dental Medicine
Background:
- Class II malocclusion presents significant challenges in orthodontic treatment.
- Differentiating treatment responses between Angle Class II, Division 1 and Division 2 is crucial for effective therapy.
- Bionator therapy is a common orthodontic approach for Class II correction.
Purpose of the Study:
- To evaluate the long-term effectiveness of isolated bionator therapy in Class II malocclusion patients.
- To investigate potential differences in skeletal and dentoalveolar responses between Angle Class II, Division 1 and Division 2.
- To assess the stability of treatment outcomes post-retention.
Main Methods:
- Retrospective analysis of lateral cephalograms from 50 juvenile Class II patients (24 Division 1, 26 Division 2).
- Cephalometric parameters (SNA, SNB, ANB, Wits appraisal, incisor inclinations) analyzed at three time points: pre-treatment, post-active therapy, and end of retention.
- Statistical significance and biometric differences between Angle Class variations were assessed.
Main Results:
- Significant skeletal improvements observed, including increases in SNB and SNPog, and decreases in ANB and Wits appraisal between pre-treatment and post-therapy.
- Dentoalveolar changes included significant alterations in upper incisor inclination (retrusion in Division 1, protrusion in Division 2) and interincisal angle.
- Minimal changes were noted between the end of active therapy and the end of retention, indicating treatment stability.
Conclusions:
- Bionator therapy demonstrates significant and stable skeletal efficacy in both Angle Class II, Division 1 and Division 2 malocclusions.
- The treatment successfully achieved desired effects on anterior teeth alignment without significant compensatory dentoalveolar changes in the mandible.
- The findings support bionator therapy as an effective long-term solution for Class II malocclusions.
