关键词: 头颅侧位片, 蝶鞍, 鞍桥, 骨性错牙合畸形

Abstract: Objective　To investigate the size and shape of sella turcica and the incidence of sella bridge in patients with different skeletal malocclusion. Methods　Totally 100 patients with skeletal class Ⅰ malocclusion（group Ⅰ），100 patients with skeletal class Ⅱ malocclusion（group Ⅱ）and 100 patients with skeletal class Ⅲ malocclusion（group Ⅲ）were selected from the First Outpatient Clinic and the Second Orthodontic Department of the Affiliated Stomatological Hospital of China Medical University from July 2016 to September 2019. The lateral cephalogram of patients in each group was collected，Winceph 8.0 software was used to locate the relevant marker points，and the length，depth and diameter of sella were measured. At the same time，the shape of sella（flat，oval，round）and the type of sellar bridge（no sellar bridge，partial sellar bridge，complete sellar bridge）were recorded，and the incidence of sellar bridge in each group was calculated. SPSS 25.0 software was used to analyze the data statistically. Results　There was no significant difference in the size or shape of sella turcica among the three groups（P > 0.05），but there was significant difference in the incidence of sellar bridge（P < 0.001）. The incidence of sellar bridge in patients of group Ⅲ（66.0%）was significantly higher than that of group Ⅰ（17.0%）and group Ⅱ（34.0%）. There was no significant difference in the size or shape of sella turcica or the incidence of sellar bridge among patients of different genders（P > 0.05）. Conclusion　The incidence of sellar bridge is significantly increased in patients with skeletel  Ⅲ，suggesting that the occurrence of sellar bridge may be related to cranio-maxillofacial malocclusion.

Key words: cephalometric radiogragh, sella turcica, sella bridge, skeletal malocclusion