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Skeletal stability following mandibular advancement and rigid fixation
Summary
This study on surgical mandibular advancement found that rigid fixation is a highly stable and reliable procedure. Minimal skeletal relapse occurred, indicating predictable outcomes for patients.
Area of Science:
- Orthognathic surgery
- Craniofacial surgery
- Skeletal stability
Background:
- Sagittal ramus osteotomies are frequently used for mandibular advancement.
- Rigid fixation has become the standard for stabilizing osteotomies.
- Assessing skeletal stability post-surgery is crucial for treatment success.
Purpose of the Study:
- To evaluate the skeletal stability of mandibular advancement using sagittal ramus osteotomies and rigid fixation.
- To quantify any relapse or changes in facial height and mandibular position after surgery.
Main Methods:
- Twenty non-growing subjects underwent sagittal ramus osteotomies and rigid fixation.
- Lateral cephalograms were analyzed pre-surgery, immediately post-surgery, and at least six months post-surgery.
- Measurements included horizontal and vertical changes, and mandibular rotation.
Main Results:
- A mean horizontal relapse of 0.42 mm (8%) was observed, which was statistically insignificant.
- A mean vertical increase in lower face height of 0.2 mm was found, also statistically insignificant.
- A statistically significant (P < 0.015) mean backward rotation of the mandible (0.55 degrees) was noted, but deemed clinically insignificant.
Conclusions:
- Surgical mandibular advancement with rigid fixation demonstrates high skeletal stability.
- The procedure is reliable, with minimal and clinically insignificant skeletal changes observed at six months post-surgery.
- Rigid fixation contributes to predictable outcomes in mandibular advancement surgeries.