Restor Dent Endod.  2022 May;47(2):e22. 10.5395/rde.2022.47.e22.

Effectiveness and safety of rotary and reciprocating kinematics for retreatment of curved root canals: a systematic review of in vitro studies

• Simões LP
• Reis-Prado AHd
• Bueno CRE
• Viana ACD
• Duarte MAH
• Cintra LTA
• Lemos CAA
• Benetti F

• KMID: 2548126
• DOI: http://doi.org/10.5395/rde.2022.47.e22

Abstract

Objectives
This systematic review (register-osf.io/wg7ba) compared the efficacy and safety of rotary and reciprocating kinematics in the removal of filling material from curved root canals.
Materials and Methods
Only in vitro studies evaluating both kinematics during retreatment were included. A systematic search (PubMed/MEDLINE, Scopus, and other databases, until January 2021), data extraction, and risk of bias analysis (Joanna Briggs Institute checklist) were performed. Efficacy in filling removal was the primary outcome.
Results
The search resulted in 2,795 studies, of which 15 were included. Efficacy was measured in terms of the remaining filling material and the time required for this. Nine studies evaluated filling material removal, of which 7 found no significant differences between rotary and reciprocating kinematics. Regarding the time for filling removal, 5 studies showed no difference between both kinematics, 2 studies showed faster results with rotary systems, and other 2 showed the opposite. No significant differences were found in apical transportation, centering ability, instrument failure, dentin removed and extruded debris. A low risk of bias was observed.
Conclusions
This review suggests that the choice of rotary or reciprocating kinematics does not influence the efficacy of filling removal from curved root canals. Further studies are needed to compare the kinematics safety in curved root canals.

Keyword

Curved root canals; Nickel-titanium instruments; Reciprocating; Retreatment; Rotary kinematics

Figure

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  Figure 1 Flow diagram of the search strategy of the systematic review following the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines.

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  Figure 2 Assessment of the risk of bias in the included studies according to the percentage of the scores assigned to each evaluated study.

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