E-ISSN 2548-0839
3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals
1 Department of Endodontics, İnönü University School of Dentistry, Malatya, Turkey  
2 Department of Endodontics, Ondokuz Mayıs University School of Dentistry, Samsun, Turkey  
3 Private Dental Clinic, Malatya, Turkey  
4 Department of Endodontics, Akdeniz University School of Dentistry, Antalya, Turkey  
Eur Endod J 2017; 2: 22-22
DOI: 10.5152/eej.2017.17004
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Key Words: Micro-CT, quality of obturation, Revo-S, Self-adjusting file, void, and gap

Objective: This study used microcomputed tomography (micro-CT) to compare the volumes of voids and gaps in curved root canals instrumented and filled using various techniques.


Methods: Twenty extracted mandibular first molars with two curved mesial root canals were used. Root canals were instrumented using a self-adjusting file (SAF) or Revo-S file system. For standardization, mesiobuccal canals were instrumented with SAF and mesiolingual canals were instrumented with Revo-S in each root. The canals were divided into four experimental groups (n=10 in each). The canals were then filled via cold lateral compaction (CLC) or a thermoplasticized injectable technique (TT) using gutta-percha and AH Plus root canal sealer. The roots were scanned with a micro-CT, and the volumes of the voids and gaps were calculated using three-dimensional (3D) micro-CT images. Data were analyzed using unpaired t- and Kruskal-Wallis tests. A value of P < 0.05 was considered significant.


Results: None of the tested techniques provided void- or gap-free fillings. Nevertheless, the SAF showed more gap formation than the Revo-S, and TT showed higher gap formation in all experimental groups. These differences, however, were not statistically significant (p>0.05).


Conclusion: The SAF and Revo-S rotary file systems yielded comparable results. No statistically significant difference was found between the results of the various instrumentation and filling techniques.

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