桩腔预备的不同时机对两种根管封闭剂根尖封闭性的影响

Effect of different space preparation time on the apical sealing by two kinds of root canal sealers

目的:通过比较根尖微渗漏的长度来观察即刻桩腔预备和延迟桩腔预备对两种根管封闭剂根尖封闭性的影响。方法:将120颗上颌单根管牙齿以Pr oTaper手用镍钛根管锉逐步深入法根管预备,随机分为A、B两组,每组60颗。分别用AHpl us糊剂、Cort i somol糊剂加牙胶尖热侧向加压法进行根管充填。根充后根据桩腔预备情况将A、B两组随机再分为A1、A2、A3和B1、B2、B3 3个亚组,每组20颗。A1、B1组即刻行桩腔预备,A2、B2组1周后行桩腔预备,A3、B3组为对照组未行桩腔预备。染料渗透法测量微渗漏距离并进行统计学分析。结果:两组牙齿根尖部均有微渗漏产生。采用单因素方差分析各实验组间微渗漏差异有统计学意义(F=19.2033,P<0.01),LSD-t检验对组间进行两两比较:两种根管封闭剂根充后延迟桩腔预备组和即刻桩腔预备组、对照组微渗漏差异有统计学意义(P<0.01)。延迟桩腔预备不同封闭剂充填组之间微渗漏差异有统计学意义(P<0.01)。其余各组之间微渗漏差异无统计学意义。结论:即刻桩腔预备对两种根管封闭剂的根尖封闭能力没有影响,延迟桩腔预备降低了根管封闭剂的根尖封闭能力;延迟桩腔预备中AHpl us的根尖封闭性比Cort i somol好。

Objective To study the effects of immediate and delayed post space preparation on the apical sealing by two kinds of root canal sealers by comparing the length of apical micro-leakage. Methods 120 extracted maxillary teeth each with a single canal were selected.All canals were prepared by manual ProTaper instrument using crown-down technique and then were randomly divided into Group A and Group B,each with 60 teeth.They were then filled with gutta-percha point of the kind as AH-Plus paste and Cortisomol paste respectively in rateral pressure way.Then according to the post-space-preparation time,group A was randomly divided into 3 groups,which were A1,A2,A3,and then the same was done to group B,which were B1,B2, B3,each group had 20 teeth：Immediately （A1/B1）,one weeks later （A2/B2）,and （A3/B3）,as a control group,didn＇t conduct post space preparation.The different apical sealing effects of the groups were evaluated with dye penetration method.Micro-leakage dye penetration distance measured and analyzed statistically. Results The apical teeth of the two groups showed some apical micro-leakage.The microleakage showed significant difference by one-way between-subjects analysis of variance （F=19.2033,P〈0.01）, LSD-t test was used for comparison between group：There was significant difference on apical micro-leakage of two root canal sealers after root canal delayed post cavity preparation group and the immediate post space preparation group and the control group （P〈0.01）,and there was significant difference on delayed post space preparation in different filling sealers＂ groups （P〈0.01）.The micro-leakage between the other groups showed no significant difference. Conclusion Immediate post space preparation on the two root canal sealers did not affect the apical sealing ability, delayed post space preparation reduces the apical root canal sealers sealing ability .The delayed post space preparation on the apical AH-plus has better root canal seal ability than Cortisomol.