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The Stability of Anterior Open Bite Closure After Bimaxillary Osteotomy

Abstract

Introduction

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).

Results

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.

Conclusion

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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Funding

No funding was received.

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Correspondence to Islam Ellabban.

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No conflict of interest related to this study.

Ethical Approval

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

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Keywords

  • Relapse
  • Anterior open bite
  • Bimaxillary osteotomy
  • Overbite