In vitro studies of smear layer and retrograde fil ing material impact on apical microleakage after down -fil ed
Objective:Af ect apical microleakage after fil ing material with the smear layer on the application of three root canal.Method:Select 64 single root canal teeth after root canal preparation,cold lateral condensation gut a -percha root canal fil ing,after removal of the apical root canal preparation down.Randomly divided into experimental group and control group (n =30 each).Experimental group:17%EDTA +1% chloramine -T remove the smear layer,In the control group:5ml saline.Randomly selected from two groups do SEMobservation.Each group was randomly divided into 3 groups were MTA,GIC,HG were down fil ing,taking root canal fil ing the upper section.Placing micro -leakage model.First detected in concentrations ranging from 0 days 1,2,4,7,10,15,20,30 crown direction leaked square root of glucose.Results:MTA's closure at each time point were superior GIC,HG.Dif erent back molars same treatment (re-moval or retention)under the fil ing material compared pairwise dif erences were statistical y significant P <0.05).With a fil ing material in the smear layer removal and retention process, MTA,GIC remove the smear layer and MTA,GIC retain glucose smear layer at each time point oozing concentrations were lower than retain the smear layer,HG compared to tarnish the removal or retention layer was no significant dif erence (P >0.05).Conclusion:MTA apical closure than GIC,HG,application MTA,GIC as a retrograde fil ing material after removal of the smear lay-er apical sealing bet er,but no dif erence in HG.
Retrograde fil ing techniqueSmear layerGlucose oxidaseSEM
NETL
NSTL
万方数据
维普
