Effects of different root canal obturation techniques on apical sealing ability of iRoot SP / 中国医师杂志

ABSTRACT

Objective:The aim of this study was to evaluate different root canal obturation techniques on apical sealing ability of iRoot SP.Methods:Thirty-six single root mandibular premolar were collected. The root canals were mechanically instrumented with ProTaper rotary files to F3. The prepared samples were randomly divided into four experimental groups ( n=8) for root canal filling. The remaining four teeth were classified as a negative group ( n=2) and a positive control group ( n=2) respectively. The canals in the four experimental groups were obturated with gutta-percha and (or) iRoot SP, by either cold lateral compaction technique (CLC), continuous wave condensation technique (CWC), single-core technique (SC) or Sealer only backfill technique (SOB) respectively. The samples were then placed in a 37 ℃ water bath for 7 days to allow completely harden. All samples of experimental groups were sealed with nail polish except 1 mm from the apex and negative control group was fully enclosed while positive control group was fully open, then all root tips were immersed in 0.1% methylene blue solution for 7 days, then cut along the long axis of the tooth on a low-speed microtome, observed under a microscope (X10) and photographed. The software of image J was used to measure the apical leakage. Results:Apical microleakage were present in all filling techniques. SC technology showed higher apical leakage [(5.02±2.23)mm], while CWC showed lower [(3.59±1.76)mm], but there were no statistical difference ( P>0.05). Conclusions:All filling techniques can not completely seal the root apical, SOB technology has the similar apical sealing performance as other techniques.