[Clinical retrospective study of navigation guided impacted maxillary supernumerary tooth extraction].

Objective: To analyze the efficiency and safety of navigation guided extraction of impacted supernumerary tooth. Methods: Twenty-five cases of navigation guided supernumerary tooth extraction and 25 cases of non-navigation guided supernumerary tooth extraction (control group) were included in the study. Each group had 3 cases with one impacted supernumerary tooth and 22 cases with two impacted teeth. Results: Preoperative navigation system designing time was (45.0±8.0) min in average. Navigation system installation time was (15.0±2.8) min. The average operation time was (0.64±0.08) hour in navigation group and (0.91±0.09) hour in control group. Conclusions: Navigation guided extraction of impacted supernumerary tooth takes less time for operation but more time for the preoperative navigation system design.目的： 为防止邻牙的损伤，对导航下拔除上颌埋伏多生牙的临床应用进行总结分析，以期为临床提供参考。 方法： 选取武汉大学口腔医学院口腔颌面创伤与整形美容外科2013年7月至2017年9月收治的上颌埋伏多生牙患者共50例，按照随机对照原则分为导航系统辅助拔牙组（导航下辅助拔除多生牙）与对照组（直接手术拔除多生牙），每组25例。每组均包含22例2颗多生牙和3例1颗多生牙患者。统计每组平均手术时间及导航设计时间、导航安装时间；并对5名高年资医师（≥40岁）和5名青年医师（<40岁）对导航系统辅助拔牙的认可度的视觉模拟评分（visual analogue scale，VAS）进行统计学分析。 结果： 导航系统辅助拔牙组术前设计时间为（45.0±8.0）min，导航系统安装时间为（15.0±2.8）min，对照组这两项时间均为0 min。导航系统辅助拔牙组平均手术时间为（0.64±0.08）h，对照组为（0.91±0.09）h，导航系统辅助拔牙组显著小于对照组（t=-11.612，P=0.000）。青年医师和高年资医师对导航下拔牙认可度的VAS评分分别为（9.0±0.3）和（6.8±0.5）分，高年资医师对导航下拔牙的认可度显著低于青年医师（t=8.797，P=0.000）。 结论： 在上颌埋伏多生牙的手术中采用导航系统辅助精确定位，可有效缩短手术操作时间，但会增加术前设计时间；相比高年资医师，青年医师对使用导航系统辅助拔牙更认可。.