4.5 Article

Microscopic and chemical evaluation of the filling quality of five obturation techniques in oval-shaped root canals

Journal

CLINICAL ORAL INVESTIGATIONS
Volume 25, Issue 6, Pages 3757-3765

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s00784-020-03703-9

Keywords

Filling quality; Gutta-percha tags; Root canal; Void areas

Funding

  1. Department of Endodontics and conservative dentistry at Faculty of DentalMedicine, Strasbourg, France

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GuttaCore and Thermafil groups showed significantly higher gutta-percha-filled areas and lower sealer-filled areas compared to the other groups at both 4 mm and 2 mm levels. There was also a significant improvement in obturation quality with the presence of gutta-percha tags in the GuttaCore and Thermafil groups compared to the other groups.
Objectives The aim of this study was to assess the filling quality of five obturation techniques in oval-shaped root canals. Materials and methods A total of 212 mandibular first molars with one distal oval canal were selected. Distal canals, shaped with WaveOne Gold Primary, were randomly divided in five groups (n = 40) for obturation: continuous wave condensation, GuttaCore, Thermafil, single cone with AH plus, and single cone with BioRoot RCS. The proportions of gutta-percha-filled areas (GPFA), sealer-filled areas (SFA), void areas (VA), and the sealer/gutta tags into dentinal tubules at 4 mm and 2 mm from the apex were analyzed by an optical numeric microscope, SEM, and energy-dispersive X-ray (EDX). Data were then compared by Kruskal-Wallis one-way ANOVA on ranks (alpha = 0.05). Results At 4 mm, a statistically significant higher GPFA and lower SFA were observed in the GuttaCore and Thermafil groups compared with the 3 other groups. A statistically significant lower VA was observed in the continuous wave condensation, GuttaCore, and Thermafil groups than in the two single-cone groups. At 2 mm, there were a statistically significant higher GPFA and lower SFA and VA in GuttaCore and Thermafil groups than in the 3 other groups. At the two levels investigated, the presence of gutta-percha tags was clearly demonstrated for GuttaCore and Thermafil groups; no tags were observed in the 3 other groups. Conclusions Obturation quality was overall improved in GuttaCore and Thermafil groups.

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