| Summary: | 碩士 === 長庚大學 === 顱顏口腔醫學研究所 === 101 === Background and purpose:
The alteration of the nasolabial soft tissue after maxillary Le Fort I osteotomy is one of the most common complaints of patients after surgery. This study compared the effectiveness of a modified and conventional alar base cinch technique on changes over the nasolabial morphology after maxillary Le Fort I osteotomy.
Material &; Method:
The prospective randomized controlled study recruited 32 skeletal Class III patients who received maxillary Le Fort I osteotomy to correct skeletal discrepancies. During the intraoral wound-closing procedure, patients were equally separated into 2 groups. C group (14 patients) received the conventional alar base cinch technique; M group (15 patients) received the modified technique. 3dMD stereogrammetry was taken preoperatively (T0), postoperative 4-6 weeks (T1) and 6 months (T2), and 3D CBCT data was taken at T0 and T1. Three dimensional soft tissue and skeletal movement changes were measured.
Results:
No significant changes between C and M group were shown at T1, and nasal width widening was significantly reduced by 1.40 mm in the C group than in the M group at T2. NLA significantly increased at C and M groups post-surgically 4-6weeks by 8.37 ± 1.37 degree and 10.51 ± 1.69 degree. Nasal tip protrusion significantly increased 0.75 ± 1.56 mm and nasal width decrease 1.19 ± 1.93 mm in C group at T2, and overall upper lip height significantly increased 1.05 ± 1.57 mm in M group at T2.
Conclusion:
Both C and M alar base cinch suture techniques are effective to control the nasal width, alar base width, and nostril vertical dimension show.
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