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目的：评价微创与传统拔牙法拔除下颌阻生第三磨牙的术后愈合情况，进一步验证微创拔牙法的优越性。方法选取2010年9月至2012年10月在佛山市禅城区向阳医院·禅城区口腔医院就诊，且需要拔除中位、前倾阻生下颌第三磨牙的男性患者100例，随机分为试验组和对照组（各50例）。试验组采用微创拔牙法，对照组采用传统拔牙法。比较2组患者术后发生水肿、疼痛、张口受限等情况的差异，并记录2组患者牙槽窝骨愈合过程中的骨密度曲线图。结果试验组患者术后水肿、疼痛的发生率低于对照组（P〈0.05），试验组患者术后第4、8、12周的牙槽窝骨密度变化值明显高于对照组患者（P〈0.01），两组差异有统计学意义。两组患者张口受限发生率比较，差异无统计学意义（P〉0.05）。结论微创拔牙术有利于牙槽窝的愈合，值得临床推广应用。

Comparison study of atraumatic and traditional extraction for impacted mandibular third molar

Objective To research the healing of impacted mandibular third molar through atraumatic extraction so as to further verify the advantages of atraumatic extraction. Methods Totally 100 cases of male patients with median-leaning forward impacted mandibular third molar from September 2010 to October 2012 in Chancheng District Xiangyang Hospi-tal of Foshan were selected as experiment group and control group at random. Each group had 50 cases. For the experi-ment group,we adopted atraumatic extraction. For the control group,we used traditional extraction. Then we compared the differences in postoperative edema,pain and limited mouth opening of two groups,and observed two groups density curve of the alveolar bone in the healing process. Results For the experiment group,postoperative edema and pain rates were lower than the control group（P〈0.05）,the value of density change of alveolar bone was significantly higher than the control group after 4,8,12 weeks（P〈0.01）. The differences between two groups had statistical significance. The limited mouth opening rates in two groups had no statistical significance（P〉0.05）. Conclusion Atraumatic ex-traction is good for the healing of tooth socket,which is worthy of clinical popularization and application.