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Retrospective Study to Determine Stability of Mandibular Setback Surgery using Bilateral Sagittal Split Osteotomy
C Upadhyaya1, N K Chaurasian1, D Kafle2
1Department of Oral and Maxillofacial Surgery, Dhulikhel Hospital, Kathmandu University Hospital, Kavre, Nepal.
Kathmandu University Medical Journal (KUMJ)
|January 17, 2018
Summary
This study on mandibular setback surgery using bilateral sagittal split osteotomy in Nepal found minimal relapse after 8-12 months. The orthognathic procedure demonstrated skeletal stability in the Nepalese population.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Skeletal Biology
Background:
- Bilateral sagittal split osteotomy is a common orthognathic surgery for mandibular advancement.
- Mandibular setback procedures carry a higher risk of relapse compared to other orthognathic surgeries.
Purpose of the Study:
- To assess the skeletal stability of mandibular setback using bilateral sagittal split osteotomy in the Nepalese population.
- To evaluate relapse rates and cephalometric changes following the surgical procedure.
Main Methods:
- Lateral cephalograms of 14 patients were analyzed pre-operatively, immediately post-operatively, and 8-12 months post-operatively.
- Cephalometric analysis included Burstone's, Steiner's, and McNamara analyses to measure angular and linear changes.
- Paired t-tests were used to compare changes between measurement points (P1-P2, P1-P3, P2-P3).
Main Results:
- Mean mandibular setback was 3.03 mm at Pogonion and 4.64 mm at Point B.
- Mean relapse was minimal: 0.03 mm at Pogonion and 0.02 mm at Point B.
- Significant angular and horizontal changes were observed immediately post-surgery, with no significant changes at the 8-12 month follow-up.
Conclusions:
- Mandibular setback using bilateral sagittal split osteotomy shows significant skeletal stability in the Nepalese population with minimal relapse at 8-12 months.
- This preliminary study suggests the procedure is stable, but larger sample sizes and longer follow-up periods are recommended.
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