2种根管充填方式下即刻和延迟桩道预备对根尖微渗漏影响的体外研究

In vitro effect of immediate and delayed post- space preparation on apical leakage following 2 root canal obturation techniques respectively

目的:比较2种根管充填时即刻和延迟桩道预备对根尖微渗漏的影响。方法:收集60颗新鲜拔除的单根管前磨牙,截冠后拔髓并使用M3-Pro系统进行根管预备,随机进行AH-Plus热牙胶根管充填(A组,30颗)和iRoot SP单尖法充填(B组,30颗)。再将A或B组中的样本进一步随机分为:A1和B1组(延迟桩道预备,各10颗);A2和B2组(即刻桩道预备,各10颗);A3和B3组(对照组,各10颗)。全部样本均保留根尖5 mm的充填材料。染色法比较各组样本根尖微渗漏情况。结果:各组根方染料深度(mm)均值分别为:A1组3.986±0.500,A2组3.382±0.806,A3组2.178±0.554(P<0.05);B1组3.844±0.877,B2组3.416±0.579,B3组1.897±0.217(P<0.05)。B1和B2组间比较,P>0.05;A1与B1组间比较P>0.05;A2和B2组间比较,P>0.05。结论:2种根管充填方式下桩道预备均能影响根尖微渗漏,即刻桩道预备较延迟桩道预备对根尖微渗漏的影响更小,尤其是热牙胶根管充填存在显著差异;在即刻桩道预备和延迟桩道预备中,两种根管充填方式对根尖微渗漏的影响无显著差异。

Objective:To compare the effect of immediate and delayed post-space preparation on apical sealing ability between 2 root canal obturation techniques.Methods:60 freshly extracted single-rooted human premolars were collected and instrumented by M3-Pro instruments.The specimens were randomly divided into 6 groups and respectively treated by AH-Plus sealer with warm vertical compaction(WVC)followed by delayed post-space preparation(PSP)(A1);AH-Plus sealer with WVC followed by immediate PSP(A2);AH-Plus sealer with WVC,control group(A3);iRoot SP sealer with single cone(SC)followed by delayed PSP(B1);iRoot SP sealer with SC followed by immediate PSP(B2);iRoot SP sealer with SC,control group(B3).In group A1,A2,B1 and B2,gutta percha was removed by 1#starter drill and post-space was prepared by 2#finishing drill leaving 5 mm of apical filling.In control groups(A3 and B3),only apical 5 mm of the specimens was obturated.Dye leakage was measured as the linear penetration(LP)of the stain.The SPSS one-way analysis of variance test was used for statistical analysis.Results:The LP(mm)of group A1,A2,A3,B1,B2 and B3 was 3.986±0.500,3.382±0.806,2.178±0.554,3.844±0.877,3.416±0.579 and 1.897±0.217 respectively.Among A1,A2 and A3 groups,P<0.05.The LP of group A1 was higher than that of group A2(P<0.05).Among group B1,B2 and B3,P<0.05,but between group B1 and B2,P>0.05.Between group A1 and B1,P>0.05.Between A2 and B2,P>0.05.Conclusion:Apical sealing is affected by PSP with the 2 root obturation techniques.Delayed PSP may have negative effect on apical sealing compared with immediate PSP,especially in the specimens compacted by AH-Plus sealer with WVC.