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Published on: October 27, 2020
[Evaluation of the filling quality of different root canal obturation techniques using micro-CT]
Hai Xu1, Xiao-Hui Qiu, Guang-Dong Zhang
1Department of Conservative Dentistry and Endodontics, Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Affiliated Hospital of Stomatology, Nanjing Medical University. Nanjing 210029, China.
Purpose:
The aim of this study was to evaluate the quality of different root canal obturation techniques by micro-CT.
Methods:
Forty single-canal upper incisors were collected and decoronated to obtain 12 mm root segments. The root canals were prepared by using ProTaper rotary files and allocated into 4 groups randomly(n=10), then obturated with gutta-percha and(or) iRoot SP by cold lateral compaction (CLC), continuous wave condensation (CWC), single core (SC), sealer-only buckfill (SoB) techniques, respectively. Each tooth was then scanned with micro-CT, and the percentage of 3D volume and 2D slices of voids and gaps were calculated 1 week later. The data were analyzed using SPSS 22.0 software package.
Results:
Percentage of cross-sections with voids and gaps in CWC group was significantly less than others (P<0.05) , and it had a significantly greater filling area in 3D volume in whole root canal, middle third and coronal third levels (P<0.05), while SOB group had the largest filling quality in apical third levels (P<0.05).
Conclusions:
No filling technology can avoid voids. CWC technology provides the best filling performance.
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