1 Year Post-Op CT Analysis of Square Jaw and Chin Surgery with Masseter Muscle Reduction

By Dr. Park Jong-chul, Oral and Maxillofacial Surgeon

This case study presents a detailed CT analysis of a patient one year after square jaw and chin surgery, including masseter muscle reduction. We will objectively evaluate the surgical outcome by comparing CT scans taken pre-operatively, 3 months post-operatively, and 1 year post-operatively, highlighting interesting changes observed throughout the recovery process.

1. Pre-operative Analysis

• The chin deviated 3.6mm to the left. The width of the zygomatic arch was slightly wider on the right side (72.47mm/71.65mm).

• The pre-operative face had a predominantly square appearance, masking the chin asymmetry.

• The mental protuberance was more developed on the left side.

• Square jaw surgery and chin surgery were planned to achieve facial balance and a slimmer facial contour.

  
  

2. 3 Months Post-operative

• A significant reduction in facial width was observed, with no noticeable asymmetry.

• Interestingly, the midface appeared fuller despite only undergoing square jaw and chin surgery. This could be attributed to soft tissue redistribution or post-operative swelling.

  
  
  
  

3. 1 Year Post-operative

• The fullness in the midface significantly decreased, likely due to the resolution of post-operative swelling.

• The patient experienced a 0.9kg weight loss and a 1% decrease in body fat percentage between the 3-month and 1-year post-operative marks.

• Increased thickness around the lips suggests changes in lip movement habits, possibly due to increased lip muscle use.

• Despite weight loss, certain areas exhibited increased soft tissue thickness, likely related to soft tissue (muscle, buccal fat) redistribution following square jaw surgery.

• Identical squares were placed in the same location on pre-operative and 1-year post-operative CT scans for easier comparison.

4. 3 Months vs. 1 Year Post-operative

• Comparison of the 3-month and 1-year post-operative CT scans revealed downward bone growth.

• Soft tissue increased bilaterally by 1.78mm between the 3-month and 1-year post-operative periods.

• Masseter muscle thickness increased by 2.25mm on the right and 2.65mm on the left compared to the 3-month post-operative measurements.

• Midface swelling decreased by 1.53mm bilaterally after square jaw surgery.

• The jawline definition became more pronounced.

  
  

5. Further Analysis and Discussion

• The patient experienced a total weight loss of 3.4kg and a 2.4% reduction in body fat percentage from pre-operative to the 1-year post-operative mark.

• Despite the 0.9kg weight loss and 1% body fat reduction between the 3-month and 1-year post-operative periods, the masseter muscles thickened. This highlights the impact of factors like teeth grinding and clenching habits on masseter muscle size.

• Improving the habit of clenching teeth can enhance long-term facial slimming effects.

• Adequate chewing exercises can promote brain activation, suggesting the importance of combining a healthy diet with regular chewing exercises

Conclusion

This case study provides a comprehensive CT analysis of changes observed one year after square jaw and chin surgery. Long-term follow-up observations are crucial for patient satisfaction and maintaining successful surgical outcomes. Continuous management and effort are necessary to achieve optimal results.

Dr. Park Jong-chul, Oral and Maxillofacial Surgeon

For more information, please visit

https://blog.naver.com/vvsaz144/223555589323 for korean

https://blog.naver.com/vvsaz144/223649660047 for english

1 Year Post-Op CT Analysis of Square Jaw and Chin Surgery with Masseter Muscle Reduction

1 Year Post-Op CT Analysis of Square Jaw and Chin Surgery with Masseter Muscle Reduction