目的 设计一款辅助颌骨内异物取出术的新型手术导板，并进行体外模型评估和临床验证。   方法  基于锥形束计算机断层扫描数据和环钻技术，自主设计颌骨内异物取出术的外科手术导板，通过体外羊下颌骨模型评估该导板的可行性和准确性，并将其成功应用于临床病例。通过在柱状骨的六角和顶点处测量7个参数（cdh、cda、hdh、hda、vdh、vda和ad）距离，计算轴偏移角，评估实际去除和计划去除圆柱状骨之间的线性和角度偏差。   结果  体外模型显示该导板的六角和顶点的平均中心偏差分别为(0.51±0.14) mm和(0.62±0.19) mm。六角处的水平偏差为(0.48±0.16) mm，顶点处的水平偏差为(0.52±0.22) mm，六角处的垂直偏差为(0.17±0.09) mm，顶点处的垂直偏差为(0.29±0.13) mm，角度偏差为（5.38±3.43）°；在临床病例中，术者在导板帮助下，成功定位并取出了颌骨内断裂的根管锉。   结论  本款新型手术导板能够有效辅助目标性定位和微创性取出颌骨内断裂器械等异物。 

Objective  To design and validate a novel surgical guide for retrieval of foreign body in jaw.     Methods Firstly, a surgical guide based on cone beam computed tomography and trephine technique was designed to remove broken dental instrument fragments. Its feasibility and accuracy were assessed by removing broken dental instrument in goat mandible, and then it was successfully applied in clinical cases. The linear and angular discrepancies between actual and planned columnar bone with imaginary fragment was analyzed. The euclidean distance was measured at the hex and apex of the columnar bone and the angle of axis deviation was also calculated. We obtained seven parameters (cdh, cda, hdh, hda, vdh, vda, and ad) to describe deviations.    Results  Mean central deviation at the hex and apex was (0.51 ± 0.14) mm and (0.62 ± 0.19) mm, respectively. Accompanying mean values were as follow: horizontal deviation at the hex was (0.48 ± 0.16) mm, horizontal deviation at the apex was (0.52 ± 0.22) mm, vertical deviation at the hex was (0.17 ± 0.09) mm, vertical deviation at the apex was (0.29 ± 0.13) mm, and angular deviation of (5.38 ± 3.43) degrees. In a clinical case, the guide successfully located and removed the fracture file.    Conclusion  This study reveals that this kind novel surgical guide could aid to locate and remove the foreign body in jaw.