Nasolabial Changes Affected by 2 Different Alar Base Cinch Suture Techniques after Maxillary LeFort I Osteotomy in Class III Malocclusions: A Randomized Controlled Trial

• Main Authors: Yi Hsuan Chen, 陳怡璇
• Other Authors: W. C. Ko
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/70820793583283475237

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.