Stability and outcome of surgical-orthodontic treatment in patients of Class III deformity with and without a history of orthodontic treatment.

BACKGROUND/PURPOSE: Many adult patients seeking surgical-orthodontic treatment have previously undergone orthodontic treatment during their youth. This study aimed to compare the stability and outcome of surgical-orthodontic treatment between Class III patients who had undergone previous orthodontic treatment and those who had not.

MATERIALS AND

METHODS

82 adult Class III patients who consecutively received surgery-first bimaxillary surgery were included, 30 who had not undergone orthodontic treatment (NFO group), 25 who had undergone orthodontic treatment with premolar extraction (FO-E group), and 27 who had undergone orthodontic treatment without premolar extraction (FO-NE group). Cone-beam computed tomography were obtained pre-surgery (T0), 1 week after surgery (T1) and after debonding (T2) to determine skeletal stability and treatment outcome of skeletal, dental and soft tissue structures. Self-report questionnaires including satisfaction with facial appearance and quality of life were also evaluated.

RESULTS

Treatment outcome, satisfaction and quality of life did not differ significantly among the three groups except the mandibular alveolar thickness (6.3 ± 1.9 mm vs 5.3 ± 1.3 mm vs 5.4 ± 1.5 mm, respectively for the NFO, FO-E and FO-NE groups). Neither group exhibited a significant difference in skeletal stability except in the anterior maxilla (ANS, 1.0 ± 1.2 mm vs 0.3 ± 0.7 mm vs 0.5 ± 0.8 mm, respectively for the NFO, FO-E and FO-NE groups). Mean relapse was ≤1 mm at the maxilla and <2 mm at the mandible within each group.

CONCLUSION

A history of orthodontic treatment in patients of Class III deformity with mandibular prognathism has limited effects on the final surgical-orthodontic correction outcome.