目的：比较Er∶YAG激光排龈法和排龈线排龈法的排龈疗效。方法收集山西医科大学口腔医院修复科龈下边缘单冠修复患牙100颗，随机分为A、B两组各50颗，分别采用排龈线排龈法和Er∶YAG激光排龈法，对两组排龈效果的满意度评价及操作过程中感觉疼痛或不适的患者数进行比较；采用牙周出血指数(GBI)和牙周袋深度（PD）评价两种方法对牙周健康的影响。结果两组间牙预备体、印模和模型满意度均无统计学差异（P>0.05），B组牙龈止血效果明显优于A组（P<0.05）；B组疼痛患者比例（12%）少于A组（92%）（P<0.05）；两种方法治疗前与治疗后及两种方法之间GBI值、PD值比较差异均有统计学意义（P<0.05）。结论两种排龈法均可获得良好的排龈效果，Er∶YAG激光排龈法可减少牙龈出血，术中患者疼痛反应小，而且对牙周健康影响较小。%Objective To compare the gingival retraction effect of Er:YAG laser gingival retraction method and gingival retraction cord. Methods One hundred teeth requiring sub-gingival margin single-crown restoration in Stomatological Hospital of Shanxi Medical University were selected and randomly assigned to Group A and Group B with 50 teeth in each group. Group A and Group B were given gingival retraction cord and Er:YAG laser gingival retraction method. The satisfaction evaluation on gingival retraction effects and the number of patients feeling pain or discomfort during opera-tion were compared between the two groups. Gingival bleeding index (GBI) and periodontal pocket depth (PD) were ap-plied to evaluate the impact of the two methods on periodontal health. Results The two groups had no statistical differ-ence with regard to tooth preparation, impression and model satisfaction (P>0.05). Group B had significantly better gin-gival hemostasis effects than Group A (P<0.05). Group B had fewer patients with pain (12%) than Group A (92%) (P<0.05). There was statistical difference with regard to GBI value and PD value before and after treatment for each method and between two methods(P<0.05). Conclusion Both gingival extraction methods can achieve excellent gingival extraction effects. Er:YAG laser gingival extraction method can reduce gingival bleeding, cause less pain on patients during operation, and have less impact on periodontal health.
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