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Lag screw versus wire osteosynthesis in mandibular advancement
1Division of Maxillofacial Surgery, General Hospital St Jan, Bruges.
The International Journal of Adult Orthodontics and Orthognathic Surgery
|January 1, 1991
Summary
Mandibular advancement surgery using rigid osteosynthesis showed minimal relapse (11%), while wire fixation resulted in significant regression (45%) after one year.
Area of Science:
- Maxillofacial Surgery
- Orthognathic Surgery
- Skeletal Reconstruction
Background:
- Mandibular advancement surgery corrects jaw discrepancies.
- Osteosynthesis techniques are crucial for stabilizing bone segments.
- Comparing rigid fixation versus wire fixation is important for long-term outcomes.
Purpose of the Study:
- To compare the long-term skeletal stability of mandibular advancement using lag screw (rigid) versus wire osteosynthesis.
- To evaluate the rate of sagittal relapse at the pogonion after one year.
Main Methods:
- Retrospective analysis of 1961-1985 patient records from the University of Zurich.
- Two homogeneous groups based on osteosynthesis technique: lag screw or wire.
- Analysis of lateral cephalograms (preoperative, short-term postop, 1-year postop) using digitizing procedures and statistical analysis.
Main Results:
- The rigid osteosynthesis group (lag screw) demonstrated a mean sagittal relapse of 11%, which was not statistically significant.
- The wire fixation group showed a mean regression of 45% at the pogonion after one year.
Conclusions:
- Rigid osteosynthesis with lag screws offers superior long-term skeletal stability in mandibular advancement compared to wire fixation.
- Wire fixation is associated with a high rate of relapse in mandibular advancement procedures.