不同排龈方法对氧化锆全瓷冠临床修复效果的影响

Comparison of Different Gingival Retraction Techniques for Zirconia All-Ceramic Restorations

目的评价不同排龈方法对氧化锆全瓷冠临床修复效果的影响。方法将120颗需修复的牙按随机数字表法分为单线排龈组、双线排龈组和激光排龈组,每组40颗牙。单线排龈组用单线排龈法排龈,双线排龈组用双线排龈法排龈,激光排龈组用Er,Cr:YSGG激光排龈。对3组的牙预备体、牙龈止血效果、印模、修复体适应性及3个月后牙龈状况进行评估。结果 3组印模、模型满意度以及3个月后牙龈健康状况比较差异无统计学意义(P>0.05);双线排龈组牙体预备满意度高于其他2组(P<0.05);激光排龈组止血效果满意度最高,单线组最低(P<0.01)。结论 3种排龈方法均能取得较好的临床修复效果,激光排龈止血效果明显高于排龈线排龈,双线排龈牙体预备效果高于单线排龈及激光排龈。

Objective To evaluate the effects of different gingival retraction techniques on zir-conia all-ceramic restorations.Methods Totally 120 teeth were randomly treated with one-cord retraction technique,two-cord retraction technique or Er,Cr:YSGG laser,with 40 teeth in each group.The situation of preparation,gingival bleeding,impression and restoration adaptation were compared among the three groups.Furthermore,gingival health was evaluated 3 months after treatment.Results There were no significant differences in the satisfaction with impression and master cast and the gingival health among the three groups (P >0.05).The two-cord retraction technique achieved a higher satisfaction with tooth preparation than other techniques (P <0.05). Er,Cr:YSGG laser and one-cord retraction technique achieved the highest and lowest satisfaction with hemostatic effect,respectively (P <0.01).Conclusion All the three gingival retraction tech-niques are effective for zirconia all-ceramic restorations.However,Er,Cr:YSGG laser has better hemostatic effect than cord retraction technique,and two-cord retraction technique is more effec-tive for tooth preparation than one-cord retraction technique.