Restor Dent Endod.  2022 Feb;47(1):e13. 10.5395/rde.2022.47.e13.

Efficacy of reciprocating instruments and final irrigant activation protocols on retreatment of mesiobuccal roots of maxillary molars: a micro-CT analysis

• Tietz L
• Furlan RD
• Rosa RAd
• Duarte MAH
• Alcalde MP
• Vivan RR
• Weissheimer T
• Só MVR

• KMID: 2548108
• DOI: http://doi.org/10.5395/rde.2022.47.e13

Abstract

Objectives
This study evaluated the efficacy of 3 reciprocating systems and the effects of 2 instruments for irrigant activation on filling material removal.
Materials and Methods
Forty mesiobuccal roots of maxillary molars were prepared up to size 25.06 and obturated. Micro-computed tomography (micro-CT) examination #1 was performed. Teeth were then divided into 4 groups (n = 10), according to the retreatment protocol: (1) manual, (2) Reciproc Blue, (3) WaveOne Gold, and (4) X1 Blue. Micro-CT examinations #2 and #3 were performed after filling removal and repreparation, respectively. Next, all teeth were divided into 2 new groups (n = 20) according to the irrigant activation protocol: XP Clean (XP Clean size 25.02) and Flatsonic (Flatsonic ultrasonic tip). Micro-CT examination #4 was performed after irrigant activation. Statistical analysis was performed with a significance level set at 5%.
Results
WaveOne Gold removed a significantly greater amount of filling material than the manual group (p < 0.05). The time to reach the WL was similar for all reciprocating systems (p > 0.05). X1 Blue was faster than the manual group (p < 0.05). Only manual group improved the filling material removal after the repreparation stage (p < 0.05). Both activation protocols significantly improved the filling material removal (p < 0.05), without differences between them (p > 0.05).
Conclusions
None of the tested instruments completely removed the filling material. X1 Blue size 25.06 reached the working length in the shortest time. XP Clean and Flatsonic improved the filling material removal.

Keyword

Endodontic; Retreatment; Micro computed tomography; Reciprocating

Figure

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  Figure 1 Flowchart representing all stages of the experimental procedures.Micro-CT, micro-computed tomography.

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  Figure 2 Two-dimensional and 3-dimensional micro-computed tomography scans of each stage of the endodontic retreatment protocols. Manual (A-C), Reciproc Blue (D-F), WaveOne Gold (G-I), and X1 Blue (J-L) groups after root canal filling (A, D, G, J), filling removal (B, E, H, K) and repreparation (C, F, I, L) stages.

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  Figure 3 Two-dimensional and 3-dimensional micro-computed tomography scans of the 2 final irrigant activation protocols (before and after). XP Clean (A, B) and Flatsonic (C, D) groups after repreparation (A, C) and after final irrigant activation protocols (B, D).

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