Change in lip closing force in Classes II and III malocclusion before and after sagittal split ramus osteotomy with Le Fort I osteotomy

• Published in: Journal of cranio-maxillo-facial surgery Vol. 45; no. 9; pp. 1415 - 1418
• Main Authors: Tsutsui, Takamitsu, Yoshizawa, Kunio, Moroi, Akinori, Hotta, Asami, Fukaya, Kenichi, Hiraide, Ryota, Takayama, Akihiro, Tsunoda, Tatsuya, Saito, Yuki, Iguchi, Ran, Kosaka, Akihiko, Ikawa, Hiroumi, Ueki, Koichiro
• Format: Journal Article
• Language: English
• Published: Scotland Elsevier Ltd 01.09.2017
• Subjects: Adult; Case-Control Studies; Classes II; Classes III; Dentistry; Female; Humans; Lip - physiology; Lip closing force; Male; Malocclusion, Angle Class II - physiopathology; Malocclusion, Angle Class II - surgery; Malocclusion, Angle Class III - physiopathology; Malocclusion, Angle Class III - surgery; Orthognathic surgery; Osteotomy, Sagittal Split Ramus; Postoperative Period; Prospective Studies; Orthognathic surgery; Classes III; Lip closing force; Classes II
• ISSN: 1010-5182; 1878-4119
• DOI: 10.1016/j.jcms.2017.06.026

The purpose of this study was to examine lip closing force in Class II and III patients before and after orthognathic surgery. The subjects were 45 patients (15 Class II women, 15 Class III men and 15 Class III women) diagnosed with jaw deformity who underwent sagittal split ramus osteotomy with Le Fort I osteotomy and 30 controls with normal skeleton and occlusion (15 men, 15 women). Maximum and minimum lip closing forces were measured using Lip De Cum® before and after surgery, and compared statistically. In the Class II women, maximum and minimum lip closing forces did not change after surgery. However, maximum and minimum lip pressure increased significantly in the Class III men (P = 0.0116, P = 0.0295) and maximum lip closing force increased significantly in the Class III women (P = 0.0082). After 6 months, maximum lip closing force was significantly lower in both Classes II and III women than in the control women (P = 0.0002, P = 0.0045). This study suggested that maximum postoperative lip pressure did not improve in the Class II women, although maximum lip closing force increased in the Class III men and women after sagittal split ramus osteotomy with Le Fort I osteotomy.