【作者】 李莎莎； 秦晓红； 何佳；

【Author】 LI Sha-sha, QIN Xiao-hong ,HE Jia. (Kunming Stomatology Hospital. Kunming 650041,Yunnan Province ,China)

【机构】 昆明市口腔医院；

【摘要】 目的:旨在评估玷污层及根管封闭剂对根管充填后牙微渗漏的影响。方法:80颗新鲜拔除的根尖发育完成的单根管的人前牙,常规法预备根管,随机分为4组,A(AH-plus)、B(Apexit)、C(氧化锌丁香油糊剂)、D(根管充填剂),各组内再分为1、2 组,1组在充填前用17％EDTA及5．25％NaClO溶液交替冲洗以去除玷污层,2组仅用5．25％NaCLO溶液冲洗,所有牙采用侧方加压法充填。每颗牙的冠方插入铜丝使其与牙胶接触,浸入0．9％的NaCL溶液后,在每颗牙与一不锈钢电极间加12V的直流电,观察40天,用单因素方差分析及LSD-t检验比较10、20、30、40天时的数据。结果:AH-plus、Apexit产生的微渗漏低于氧化锌丁香油糊剂及根管充填剂,而AH-plus又低于Apexit,去除玷污层使AH-plus产生低的微渗漏值。结论:AH-plus、Apexit的封闭能力优于氧化锌丁香油糊剂及根管充填剂,去除玷污层能增加AH-plus的封闭能力。更多还原

【Abstract】 PURPOSE: The purpose of this study was to evaluate the effects of smear layer and root canal sealer on microleakage in root-filled teeth. METHODS: 80 freshly extracted human canines with closed apices and single root canal were used.All roots were instrumented with routine preparation technique. The teeth were randomly devided to 4 groups,different group with different sealers, A (AH-plus) ,B (Apexit),C (ZOE),D (Compound Thymol Cement),then the teeth in each group were divided to 2 groups,prior to obturation, groupl were flushed with 17%EDTA and 5.25%NaClo to remove the smear layer and group 2 were flushed with 5.25%NaClO only.All teeth were obturated with lateral condensation.Copper wire was placed cornally in contact with the gutta-percha in each tooth,after immersion in 0.9% NaCl solution,a 12v dc voltage was connected between each tooth and a stainless electrode.The current flow in the circuit was observed for 40 days.One way ANOVA and LSD-t test were used to compare the data at time intervals of 10,20,30 and 40days. RESULTS: Significantly less microleakage occurred in AH-plus and Apexit than ZOE and Compound Thymol Cement. AH-plus exhibited less leakage than Apexit. Remove the smear layer reduced the leakage of AH-plus. CONCLUSION: The sealing ability of AH-plus and Apexit was greater than the other sealers. Removing the smear layer can increase the sealing ability of AH-plus.更多还原