加长球型车针在下颌阻生第三磨牙拔除术中的应用

目的：评估加长球型车针在下颌阻生第三磨牙（impacted mandibular third molar，IMTM）拔除术中解除下颌牙槽骨、牙阻力的临床效果。方法：对117颗IMTM用加长球型车针去骨、截冠以解除骨-牙阻力。其中，男14例，女103例。结果：117颗IMTM均完全拔除；6例发生短暂下唇麻木，无感染病例发生。加长球型车针未发生断裂。结论：加长球型车针能精准地解除IMTM中下颌牙槽骨、牙阻力，截冠便捷 ，增隙去骨到位。

Clinical application of elongated spherical bur in removal of impacted mandibular third molar

PURPOSE: To evaluate the clinical effect of elongated spherical bur in decreasing resistance of mandibular teeth and alveolar bone, during removal of impacted mandibular third molar (IMTM). METHODS: Elongated spherical bur was used to remove bone and split the crown, in order to release bone-teeth resistance in 117 IMTM. Fourteen males and 103 females were involved in this study. RESULTS: All 117 teeth were removed completely. Transient lower lip numbness appeared in 6 patients. None of the elongated spherical bur was broken. CONCLUSIONS: Elongated spherical burs can accurately decrease the resistance of mandibular teeth and alveolar bone during removal of IMTM. It is convenient to split the crown, increase the gap and remove the surrounding bone.