Restor Dent Endod.  2021 Feb;46(1):e5. 10.5395/rde.2021.46.e5.

Impact of root canal curvature and instrument type on the amount of extruded debris during retreatment

• Serefoglu B
• Demirci GK
• Kurt SM
• Bilgi
• Çalışkan MK

• KMID: 2548055
• DOI: http://doi.org/10.5395/rde.2021.46.e5

Abstract

Objectives
The aim of the current study was to assess whether the amount of extruded debris differs for straight and severely curved root canals during retreatment using H-files, R-Endo, Reciproc and ProTaper Universal Retreatment (PTU-R) files. Additionally, the area of residual filling material was evaluated.
Materials and Methods
Severely curved (n = 104) and straight (n = 104) root canals of maxillary molar teeth were prepared with WaveOne Primary file and obturated with guttapercha and AH Plus sealer. Root canal filling materials were removed with one of the preparation techniques: group 1: H-file; group 2: R-Endo; group 3: Reciproc; group 4: PTU-R (n = 26). The amount of extruded material and the area of the residual filling material was measured. The data were analyzed with 2-way analysis of variance (ANOVA) and 1-way ANOVA at the 0.05 significance level.
Results
Except for Reciproc group (p > 0.05), PTU-R, R-Endo, and H-file systems extruded significantly more debris in severely curved canals (p < 0.05). Each file system caused more residual filling material in severely curved canals than in straight ones (p < 0.05).
Conclusions
All instruments used in this study caused apical debris extrusion. Root canal curvature had an effect on extruded debris, except for Reciproc system. Clinicians should be aware that the difficult morphology of the severely curved root canals is a factor increasing the amount of extruded debris during the retreatment procedure.

Keyword

Canal curvature; Debris extrusion; Ni-Ti instruments; Retreatment

Figure

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  Figure 1 The root canal curvature and radius measurement according to Pruett et al. [14] using AutoCAD software. (A) Straight canal, (B) severely curved root canal.

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  Figure 2 The experimental set-up for the collection of the extruded debris.

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  Figure 3 (A) An image showing the residual filling material on the root canal walls (B) calculation of the area of residual filling material using Image J software.

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