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Abstract

This study compared the effectiveness of the conventional and a new modified alar base cinch technique on changes in the nasolabial morphology after bimaxillary orthognathic surgery. Materials and methods: The prospective, blinded, randomized controlled study recruited 32 Taiwanese skeletal Class III patients (aged 18- 37 years). All of the patients had received bimaxillary orthognathic surgery to correct skeletal discrepancies.During the intraoral wound-closing procedure, patients were equally separated into 2 groups. A conventional group (C, 16 patients) received the conventional alar base cinch technique; a modified group (M, 16 patients) received the modified alar base cinch technique. The nasolabial region was measured both before ( T0 ) and 4-6 weeks (T1) after the operation with the use of cone-beam computerized tomography (CBCT) imaging and 3dMD stereogrammetry. Results: In the conventional group, only the nasolabial angle increased by 8.01°significantly; In the modified group, not only the nasolabial angle increased by 9.06° significantly, but the cutaneous height of the upper lip, the overall upper lip height, and the vermillion height of the upper lip also increased significantly after surgery. The intergroup difference of all parameters showed no significant different. Conclusion: The shortterm treatment effects indicated that no significant difference exists between the 2 different suture techniques. Long-term results are required to illustrate the stability of the alar base cinch technique.

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