糊剂输送方式对根尖封闭性影响的研究

目的比较根充糊剂输送方式对根尖封闭性的影响。方法选择100颗离体单根管前牙，使用手用Protaper镍钛器械逐步后退法预备根管，并制备桩腔。样本随机分为5组。A组为主尖输送糊剂，B组为K锉输送糊剂，C组为侧压针输送糊剂，D组为阳性对照组，E组为阴性对照组。其中3个实验组再各分为2个亚组：a亚组（副尖不带糊剂）与b亚组（副尖带糊剂）。使用葡萄糖氧化酶比色测定法测定微渗漏实验第1、2、4、7、10、15、20、25、30天时的根尖微渗漏情况，对不同糊剂输送方式下的根尖封闭性能进行比较。结果不同实验组间的微渗漏差异有统计学意义（F=4.832，P=0.001），各亚组间的微渗漏差异无统计学意义（P>0.05），其中Aa组及Ab组的微渗漏最小。结论不同糊剂输送方式对根尖封闭性有影响，主尖输送糊剂可以获得最好的即刻根尖封闭效果；副尖带与不带糊剂根管治疗后的根尖封闭性能无显著差异。为了获得较好的根尖封闭效果并简化临床操作，推荐使用主尖带糊剂、副尖不带糊剂的糊剂输送方式。

Investigation of influence on apical sealability generated by root canal sealer placement

Objective To investigate the influence of sealer placement on apical sealability in root canal treatment.Methods 100 extracted single root canal teeth were selected.All canals were prepared by manual Protaper instrument in a step-back way.The samples were divided into 5 groups randomly.A group:30 samples,sealer placement by chief gutta percha;B group:30 samples,sealer placement by K file;C group:30 samples,sealer placement by spreader;D group:5 samples,a positive control;E group:5 samples,a negative control.There were 2 subsets in each experimental group which were obturated by lateral gutta percha with or without sealer.Glucose oxidase method was used to measure the apical leakage at the 1st,2nd,4th,7th,10th,15th,20th,25th,30th day of the experiment.Results Apical sealability varied with different sealer placement methods(F=4.832,P=0.001).Sealer placement by chief gutta percha(A group) had the best instant apical sealability.However,lateral gutta percha with or without sealer didn't affect the apical sealibility.Conclusion Placing the same kind sealer in different ways can affect the apical sealability.There were no significant differences of the apical leakage no matter the lateral gutta percha with or without sealer.In order to get better instant apical sealability and simplify the clinic operation,placing the sealer with a chief gutta percha while the lateral gutta percha without sealer is recommended.