Abstract:

Objective    To investigate the relationship between Angle ClassⅢ malocclusion and sella bridge by measuring the size of sella and recording the prevalence of sella bridge to provide the basis for clinical treatment. Methods             Totally 249 cases of ClassⅢmalocclusion managed by orthodontic-orthognathic treatment were selected as experimental group，which included 120 males and 129 females. Another 296 cases of Class I malocclusion receiving orthodontic treatment were selected as control group，which included 150 males and 146 females. The ages ranged from 18 to 36 years old. The sella point was located by Winceph 8.0 software to measure the length,depth and diameter of sella. Record the shape of sella（oval，round and flat） and tpye of sella bridge （no sella bridge，partial sella bridge，complete sella bridge）. Statistical analysis was performed by SPSS 21.0. Results    Significant differences were found on the length and depth of sella between two groups，while no significant difference was found on the diameter of sella between two groups.The gender differences on the length of sella in two groups was significant，while no significant differences were found on the depth and diameter of sella. The proportion on the shape of sella from most to least in experimental group was flat，round and oval，while in control group it was round，flat and oval. There were no significant differences on genders in two groups. Besides，the occurrence of sella bridge in experimental group was 68.27% while the incidence of sella bridge in control group was 17.23%. No difference were found on the incidence of sella bridge between genders in two groups. Conclusion    The association between Angle ClassⅢ malocclusion and the size and shape of sella is significant. The prevalence of sella bridge in skeletal crossbite cases significantly increases when compared with the control group.

Key words: sella turcica, sella bridge, skeletal Angle ClassⅢ malocclusion

摘要：

目的    探讨骨性安氏Ⅲ类错牙合畸形与蝶鞍大小、形态以及鞍桥发生率的相关性，为制定正确的矫治计划提供参考。方法    选取2002—2015年中国医科大学附属口腔医院正畸-正颌联合治疗的骨性安氏Ⅲ类错牙合患者249例为试验组，其中男120例，女性129例；仅接受正畸治疗的安氏Ⅰ类错牙合者患者296例为对照组，其中男150例，女146例；所有患者年龄18 ~ 36岁。Winceph 8.0软件定位蝶鞍相关标记点，测量蝶鞍的长度、深度和直径，记录蝶鞍形态（椭圆形、圆形、扁平状）以及鞍桥类型（无鞍桥、部分鞍桥、完全鞍桥）。采用SPSS 21.0统计软件对所得数据进行统计分析。结果    试验组与对照组蝶鞍长度和深度差异均有统计学意义（均P＜0.05），而蝶鞍直径差异无统计学意义（ P＞0.05）；两组男性与女性蝶鞍长度差异均有统计学意义（均P＜0.05），而蝶鞍深度和直径差异均无统计学差异（均P＞0.05）。试验组蝶鞍各形状所占比例从大至小依次为扁平状、圆形和椭圆形，对照组依次为圆形、扁平状和椭圆形，两组男性与女性蝶鞍形态差异均无统计学意义（均P＞0.05）。试验组鞍桥发生率为68.27%，对照组为17.23%，差异有统计学意义（P＜0.05）；两组男性与女性鞍桥类型比较，差异均无统计学意义（均P＞0.05）。结论    骨性安氏Ⅲ类错牙合畸形与蝶鞍大小和形态显著相关，骨性安氏Ⅲ类错牙合患者的鞍桥发生率较对照组明显增加。

关键词: 蝶鞍, 鞍桥, 骨性安氏Ⅲ类错牙合