Restor Dent Endod.  2024 May;49(2):e20. 10.5395/rde.2024.49.e20.

Nanoleakage of apical sealing using a calcium silicate-based sealer according to canal drying methods

• Lee YJ
• Cho KM
• Park SH
• Lee Y
• Kim JW

• KMID: 2556549
• DOI: http://doi.org/10.5395/rde.2024.49.e20

Abstract

Objectives
This study investigated the nanoleakage of root canal obturations using calcium silicate-based sealer according to different drying methods.
Materials and Methods
Fifty-two extracted mandibular premolars with a single root canal and straight root were selected for this study. After canal preparation with a nickel-titanium rotary file system, the specimens were randomly divided into 4 groups according to canal drying methods (1: complete drying, 2: blot drying/distilled water, 3: blot drying/NaOCl, 4: aspiration only). The root canals were obturated using a single-cone filling technique with a calcium silicate–based sealer. Nanoleakage was evaluated using a nanoflow device after 24 hours, 1 week, and 1 month. Data were collected twice per second at the nanoscale and measured in nanoliters per second. Data were statistically analyzed using the Kruskal-Wallis and Mann–Whitney U-tests (p < 0.05).
Results
The mean flow rate measured after 24 hours showed the highest value among the time periods in all groups. However, the difference in the flow rate between 1 week and 1 month was not significant. The mean flow rate of the complete drying group was the highest at all time points. After 1 month, the mean flow rate in the blot drying group and the aspiration group was not significantly different.
Conclusions
Within the limitations of this study, the canal drying method had a significant effect on leakage and sealing ability in root canal obturations using a calcium silicate-based sealer. Thus, a proper drying procedure is critical in endodontic treatment.

Keyword

Bioceramic sealer; Calcium silicate-based sealer; Canal drying methods; Canal moisture condition; Final irrigant

Figure

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  Figure 1 IB SYSTEMS Nanoflow measuring device used to measure nanoleakage.

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  Figure 2 Schematic diagram of specimen preparation.GP, gutta-percha.

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  Figure 3 Schematic diagram of the Nanoflow sub-nanoliter-scale dentinal tubular fluid flow measurement device connected to a specimen.

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  Figure 4 Representative graphs of fluid flow (nL) after (A) 24 hours, (B) 1 week, and (C) 1 month. Leakage was measured as the flow rate (the slope of the graph) after fluid flow stabilization (black arrows).

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  Figure 5 Line charts of the mean nanoflow in the experimental groups.

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