J Dent Rehabil Appl Sci.  2022 Dec;38(4):213-221. 10.14368/jdras.2022.38.4.213.

Efficacy of retreatment NiTi files for root canals filled with calcium silicate-based sealer

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

• KMID: 2538519
• DOI: http://doi.org/10.14368/jdras.2022.38.4.213

Abstract

Purpose
The efficacy of the amount of sealer in the root canal and two retreatment NiTi file systems in removing filling materials.
Materials and Methods
Extracted premolars with a single root canal were selected for this study. After access opening and root canal preparation up to size #40/.06, the specimens were randomly divided into four groups. Gutta percha (GP) tapers of .06 or .04 were used for each group and filled using a single-cone filling technique with CeraSeal, a calcium silicate-based sealer. Each group was retreated either using the ProTaper Universal Retreatment System (PTUR) or the Hyflex Remover (HR). The time taken to remove the filling material, the amounts of apically extruded debris, and canal cleanliness were measured and compared.
Results
The amount of sealer did not affect the efficiency when removing the filling materials. However, the filling material was removed faster in the HR group than in the PTUR group. Two types of NiTi files showed similar retreatment effects in the amounts of apically extruded debris and in the degree of canal cleanliness.
Conclusion
The amount of sealer in canal filling had no significant effect on retreatability. Retreatment with HR removed filling materials is faster than PTUR. There was no difference in other removal efficiencies according to the type of retreatment NiTi file.

Keyword

calcium-silicate based sealer; HyFlex Remover; ProTaper Universal Retreatment Files; retreatment NiTi file; single-cone filling technique

Figure

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  Fig. 1 A schematic showing the apparatus used to evaluate the collection of apically extruded debris. (A) Eppendorf tube where the extruded debris or irrigants are collected, (B) Flask made of glass into which the tube is placed, (C) A 27gauge needle is placed within the tube to balance internal and external pressures.

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  Fig. 2 Representative specimens of apical 1/3 after filling material removal. Each sample represents a score according to the amount of remnant. (A) score 0, (B) score 1, (C) score 2, (D) score 3. Original magnification × 20.

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  Fig. 3 Time(s) to removal of canal filling material. PTUR, ProTaper Universal Retreatment system; HR, Hy-Flex Remover

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  Fig. 4 Amount of apically extruded debris(mg). PTUR, ProTaper Universal Retreatment system; HR, Hy-Flex Remover.

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  Fig. 5 Result on canal cleanliness score of tested groups. PTUR, ProTaper Universal Retreatment system; HR, HyFlex Remover.

Reference

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