Abstract:

Objective    To study the influencing factors of successful closed traction for maxillary impacted canine，and to further know the difficulty of the traction of impacted teeth，and then to guide the clinical treatment plan. Methods           Collect the clinical cases of impacted teeth from the year 2007 to 2016 in China Medical University Stomatology Hospital，and calculate the success rate of different impacted teeth. Measure angulation with palatal plane，positions with lateral incisors and buccal-lingual direction of maxillary impacted canine. The age of patients was also recorded at the same time. The data were analyzed statistically by SPSS 21.0 statistical software. Results    Chi-square test suggested that the age of the patient， buccal-lingual direction and the angulation affected the traction of maxillary impacted canine，but the relative position with the lateral incisor didn't. Additionally，only the buccal-lingual direction of maxillary impacted canine affected the traction by logistic regression analysis. Conclusion    The buccal-lingual direction of maxillary impacted canine is the main factor that affects the success of traction，which is to say that buccal impacted maxillary canine is more likely to have successful traction.

Key words: maxillary impacted canine, closed traction, influencing factor

摘要：

目的    研究上颌埋伏尖牙闭合牵引助萌术成功的影响因素，了解牵引埋伏牙的难易程度，指导临床治疗方案的制定。方法    收集2007年1月至2016年1月于中国医科大学附属口腔医院正畸科就诊的埋伏牙牵引病例149例，统计其中72例上颌埋伏尖牙不同牙位闭合牵引助萌术的成功率，测量上颌埋伏尖牙与腭平面角度、与邻牙位置、唇腭向方向并统计患者年龄，采用SPSS 21.0统计软件对数据进行统计分析。结果    卡方检验结果表明患者年龄、上颌埋伏尖牙唇腭向、与腭平面角度作为单因素对上颌埋伏尖牙闭合牵引结果影响差异有统计学意义（P ＜ 0.05），而埋伏尖牙与邻牙位置关系对上颌埋伏尖牙闭合牵引影响差异无统计学意义（P ＞0.05）。多因素logistic回归分析显示，仅埋伏尖牙唇腭向对牵引结果有差异。结论    埋伏尖牙的唇腭侧位置是上颌埋伏尖牙闭合式牵引的主要影响因素，即唇侧位阻生上颌埋伏尖牙更容易牵引成功。

关键词: 上颌埋伏尖牙, 闭合牵引助萌术, 影响因素