下颌阻生第三磨牙分段切割拔除术的选择

目的 探讨用涡轮机分段切割法拔除下颌中、低位阻生的第三磨牙的效果及适应证。方法 对481例675颗曲面体层片显示中、低位阻生的下颌第三磨牙用涡轮机分段切割法拔除。其中327颗实施二段切割法;348颗实施三段切割法。结果 下颌阻生第三磨牙均完全拔除;手术时间5~20 min（平均16 min）;术后发生短暂下唇麻木症状3例（3颗）,发生术后感染15例（15颗）。结论 二段切割法适用于中位近中阻生的下颌第三磨牙,三段切割法适用于中/低位近中、水平阻生的下颌第三磨牙。

Selection of segmental cutting methods for extracting impacted mandibular third molars

PURPOSE：Use of segmental cutting methods with high speed turbine for extraction of mesially impacted mandibular third molars. METHODS: Six hundred and seventy-five mesially impacted mandibular third molars in 481 persons were extracted with high speed turbine. Three hundred and twenty-seven teeth were extracted by two-segment method; three hundred and forty-eight teeth were extracted by three-segment method. RESULTS: Impacted mandibular third molar were extracted entirely; the operation time was 5-20 minutes(average 16 minutes); temporary lower lip numbness occurred in 3 teeth of 3 cases; postoperative infecting occurred in 15 teeth of 15 cases. CONCLUSIONS: Two-segment method can be applied for mesially impacted mandibular third molars, while three-segment method can be applied for mesially and horizontally impacted mandibular molars.