The aim of this study was to evaluate the long-term success rate of combined surgical-orthodontic therapy of skeletal anterior open bite.
Materials and Methods
A total of 11 patients with an anterior open bite treated with a combined surgical-orthodontic therapy were retrospectively analysed via lateral cephalometric radiographs and models before treatment, 7–10 days after surgery (T1), one year post-operatively (T2) and two years post-operatively (T3).
Ten patients continued to experience a positive overbite at T2. This decreased to 8 at T3. Three patients experienced relapse and had a negative overbite at T3. The average pre-treatment overbite was greater in the positive overbite group compared to the relapse group. Spearman’s correlation analysis revealed a correlation between preoperative maxilla–mandibular plane angle (MMPA) with the overall change in overbite. Friedman’s test followed by Bonferroni post-hoc analysis was carried out to identify any statistical significance.
In conclusion, combined surgical-orthodontic treatment achieves good results for anterior open bite. Patients with a high pre-operative MMPA have a higher risk of relapse. Lower anterior facial height ratio to total anterior facial height (LAFH/TAFH) and the amount of impaction do not significantly contribute to the risk of relapse. Long-term stability of overbite for anterior open bite patients should be around 75%.
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No funding was received.
Conflict of interest
No conflict of interest related to this study.
All the patients’ data collected were anonymized and kept confidential. Hence, this study was deemed to be exempt from a formal ethics committee approval. The study was approved by the North Cumbria Integrated Care NHS trust clinical research team.
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Ellabban, I., Germain, S., Jenkins, G. et al. The Stability of Anterior Open Bite Closure After Bimaxillary Osteotomy. J. Maxillofac. Oral Surg. (2021). https://doi.org/10.1007/s12663-021-01642-w
- Anterior open bite
- Bimaxillary osteotomy