Chin Advancement Surgery: Correcting Receding Chin and Asymmetry with Reverse Jaw Rotation and ASO
- Dr. Park
- Oct 23, 2024
- 2 min read
This case study demonstrates how chin advancement surgery, combined with jaw rotation and anterior segmental osteotomy (ASO), effectively addresses a receding chin and facial asymmetry.
What is Chin Advancement Surgery (Genioplasty)?
Chin advancement surgery corrects a weak or receding chin by adjusting the chin's length and projection. While effective for many, severe cases may require additional procedures like jaw rotation to optimize results and avoid deepening the mentolabial sulcus (the crease between the lower lip and chin).
Pre-operative Assessment
The patient presented with a chin deviated 6.48 mm to the right and positioned approximately 8 mm posterior to the ideal position.
Surgical Approach
To achieve optimal facial harmony, the following procedures were performed:
Chin advancement surgery: To bring the chin forward to a balanced position.
Jaw rotation surgery: To correct the occlusal plane (where upper and lower teeth meet) and improve jaw alignment.
Anterior segmental osteotomy (ASO): To correct protruding teeth and further refine the facial profile.
Understanding Reverse Jaw Rotation Surgery
Jaw rotation surgery corrects a slanted occlusal plane. This adjustment moves the molars downwards and the front teeth upwards, improving bite function and facial aesthetics. Combining jaw rotation with ASO allows for more precise repositioning of the upper jaw and teeth.
Post-operative Results
Three days post-surgery, the patient's chin had advanced by 9.4 mm.
3D imaging reveals the significant forward movement of the chin and the corrected occlusal plane.
Advantages of ASO for Protrusion Correction
ASO offers a major advantage over non-surgical orthodontics: immediate facial improvement. While braces can correct protrusions, they require a longer treatment time (1-2 years) and may risk root resorption. ASO provides faster results with less potential for complications.
Surgical vs. Non-surgical Options
Choosing between surgery and orthodontics depends on individual needs and preferences. Surgery offers immediate results but carries inherent risks. Orthodontics requires more time but may be preferred by some.
In this case, the patient required jaw surgery to address asymmetry and opted to combine it with ASO for simultaneous protrusion correction.
Conclusion
This case demonstrates the power of combining chin advancement, jaw rotation, and ASO to correct a receding chin, asymmetry, and protrusion. These procedures can dramatically improve facial aesthetics and function.
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Receding Chin and Asymmetry with Reverse Jaw Rotation and ASO
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