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Changes in the mandibular ramus following osteotomy--a long-term review
The British Journal of Oral Surgery
|December 1, 1980
Summary
Vertical sub-sigmoid osteotomies caused more ramus resorption than sagittal split osteotomies in patients. This radiographic study tracked changes in the ascending ramus up to 15 years post-surgery.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Radiology
Background:
- Ascending ramus changes after osteotomies can impact facial structure.
- Understanding long-term radiographic changes is crucial for surgical outcomes.
Purpose of the Study:
- To radiographically assess changes in the ascending ramus following sagittal split and vertical sub-sigmoid osteotomies.
- To evaluate the impact of coronoidotomy within the vertical sub-sigmoid procedure on the ascending ramus.
Main Methods:
- Radiographic analysis of 49 patients using orthopantomography and postero-anterior cephalometry.
- Measurement of ramus width and assessment of resorption at the ascending ramus.
- Evaluation of radiographic accuracy and reliability.
Main Results:
- Vertical sub-sigmoid (V.S.S.) osteotomies showed marked resorption in 30% of cases, compared to 5% for sagittal split osteotomies.
- Ramus width was less than 20 mm in two patients post-V.S.S. osteotomy.
- Coronoid process appearances after sectioning were documented.
Conclusions:
- Vertical sub-sigmoid osteotomies are associated with a higher incidence of ascending ramus resorption compared to sagittal split osteotomies.
- Long-term radiographic monitoring is essential to understand the consequences of these surgical procedures on mandibular anatomy.