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An alternative soft tissue analysis following mandibular setback by sagittal split ramus osteotomy.
Tateyuki Iizuka1, Nicole Eggensperger, Sebastian Wilke
1Department of Cranio-Maxillofacial Surgery, University of Bern, Switzerland. tateyuki.iizuka@insel.ch
Summary
This study found that alternative soft-to-hard tissue movement ratios after mandibular setback surgery are comparable to conventional ratios, with minimal differences considering skeletal relapse and facial patterns.
Area of Science:
- Orthodontics
- Maxillofacial Surgery
- Cephalometric Analysis
Background:
- Mandibular setback surgery involves significant skeletal and soft tissue changes.
- Understanding soft-to-hard tissue movement ratios is crucial for predicting surgical outcomes.
- Skeletal relapse and facial divergence patterns can influence these ratios.
Purpose of the Study:
- To determine alternative ratios of soft-to-hard tissue movement following mandibular setback.
- To account for skeletal relapse and varying facial divergence patterns in ratio analysis.
- To compare alternative ratios with conventional ones.
Main Methods:
- Cephalometric analysis of 30 patients.
- Mean follow-up period of 14 months.
- Evaluation of soft-to-hard tissue movement at mentolabial folds and pogonion.
Main Results:
- A 1:1 skeletal to soft tissue movement ratio was observed in mentolabial folds and at the pogonion.
- Final skeletal relapse was minimal (0.8 mm at B-point, 0.5 mm at pogonion).
- Alternative ratios were 81% and 68%; mentolabial sulcus ratio varied with facial angle but not significantly across patterns.
Conclusions:
- The difference between alternative and conventional soft-to-hard tissue movement ratios is insignificant.
- Minimal measured relapse and tracing error support the insignificance of ratio differences.
- Findings aid in more accurate prediction of soft tissue changes post-mandibular setback.