Kim Young Ho, Jeon Juhong, Rhee Joan Thomas, Hong Jongrak
Department of Orthodontics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
J Oral Maxillofac Surg. 2010 May;68(5):1106-11. doi: 10.1016/j.joms.2009.07.030. Epub 2010 Mar 3.
The purpose of the present study was to investigate the correlations between lip cant change after bimaxillary orthognathic surgery and the ratio of lip cant change and occlusal cant change after surgery.
The subjects for the present study were obtained from a group of 25 patients who underwent bimaxillary orthognathic surgery for occlusal cant correction at the Department of Oral and Maxillofacial Surgery, Samsung Medical Center (Seoul, South Korea) from January 2000 to December 2005. To be included, a patient's chart had to contain a resting frontal facial photograph in the natural head position and a corresponding posteroanterior cephalogram in occlusion on the same day before surgery and postoperatively 6 months later. The lip cant change was assessed by the angle of each labial commissure and the bi-pupillary reference line. The occlusal canting change in the frontal plane was assessed with the angle between each maxillary first molar occlusal surface and the bi-frontozygomatic suture reference line.
With the angular measurement, the average occlusal cant change was 3.09 degrees (standard deviation [SD] 1.05 degrees), and the average lip cant change was 1.56 degrees (SD 1.05 degrees). With the linear measurement, the average occlusal cant change was 2.41 mm (SD 2.75), and the average lip cant change was 1.18 mm (SD 0.43). The lip cant correction ratio to occlusal cant correction was 51.5% +/- 8.4% in the angular measurement and 48.8% +/- 9.1% in the linear measurement. With Pearson's correlation analysis, the Pearson correlation coefficient was 0.869 for the angular measurement and 0.887 for the linear measurement. A high correlation was shown between the occlusal cant change and lip cant change.
Bimaxillary orthognathic surgery can correct lip cant and occlusal cant. The average amount of lip cant correction and occlusal cant correction in our study was 51.5% +/- 8.4% and 48.8% +/- 9.1%, respectively.
本研究旨在探讨双颌正颌手术后唇倾斜度变化与术后唇倾斜度变化和咬合倾斜度变化之比之间的相关性。
本研究的受试者来自2000年1月至2005年12月在三星医疗中心（韩国首尔）口腔颌面外科接受双颌正颌手术以矫正咬合倾斜的25例患者。纳入标准为患者病历中必须包含术前当天自然头位的静息正面面部照片以及术后6个月相应的咬合后前位头颅侧位片。通过每个口角与双瞳孔参考线的夹角评估唇倾斜度变化。通过每个上颌第一磨牙咬合面与双额颧缝参考线之间的夹角评估额平面的咬合倾斜度变化。
通过角度测量，平均咬合倾斜度变化为3.09度（标准差[SD]1.05度），平均唇倾斜度变化为1.56度（SD 1.05度）。通过线性测量，平均咬合倾斜度变化为2.41毫米（SD 2.75），平均唇倾斜度变化为1.18毫米（SD 0.43）。角度测量中唇倾斜度矫正与咬合倾斜度矫正的比例为51.5%±8.4%，线性测量中为48.8%±9.1%。经Pearson相关性分析，角度测量的Pearson相关系数为0.869，线性测量为0.887。咬合倾斜度变化与唇倾斜度变化之间显示出高度相关性。
双颌正颌手术可矫正唇倾斜度和咬合倾斜度。在我们的研究中，唇倾斜度矫正和咬合倾斜度矫正的平均量分别为51.5%±8.4%和48.8%±9.1%。
