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Hard and soft tissue predictability with advancement genioplasties
J E Van Sickels1, C V Smith, B D Tiner
1Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio 78284.
Oral Surgery, Oral Medicine, and Oral Pathology
|March 1, 1994
Summary
Genial advancements impact soft tissue movement, with horizontal chin advancement showing reduced soft tissue following. Vertical chin bone changes significantly affect outcomes, influencing soft tissue thickness and stability.
Area of Science:
- Orthognathic surgery
- Maxillofacial surgery
- Plastic surgery
Background:
- Soft tissue response to genial advancements varies.
- Bony vertical movement's effect on soft tissue is understudied.
- Genial advancement involves repositioning the chin bone.
Purpose of the Study:
- To investigate the relationship between bony chin movement (horizontal and vertical) and soft tissue response after genial advancement.
- To analyze factors influencing soft tissue changes and bony stability post-surgery.
Main Methods:
- Retrospective study of 18 patients undergoing isolated genial advancements.
- Preoperative and at least 6-month postoperative assessments.
- Analysis of bony horizontal and vertical movements and corresponding soft tissue changes.
Main Results:
- Increased horizontal chin advancement correlated with decreased soft tissue following.
- Vertical shortening of the chin bone led to increased soft tissue chin thickness; lengthening caused thinning.
- Horizontal bone resorption/stability seemed more related to surgical dissection extent than advancement magnitude.
Conclusions:
- Both horizontal and vertical chin bone movements are critical determinants of soft tissue response in genial advancements.
- Vertical bone dimension changes significantly impact soft tissue thickness.
- Surgical technique, specifically dissection, may play a larger role in horizontal bone stability than the degree of advancement.