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Full Working Length Negotiation in Challenging Narrow Canals Using a Single Conservative Asymmetric Reciprocating
Felipe Gonçalves Belladonna1, Marco Simões-Carvalho1, Mário Luis Zuolo2
1Department of Endodontics, Fluminense Federal University, Rio de Janeiro, Brazil.
International Endodontic Journal
|July 26, 2026
Summary
Reciproc Minima instruments, particularly size 20, demonstrated superior ability to reach full working length in mandibular molar mesial canals compared to Reciproc Blue R25. These instruments achieved higher success rates without increased fracture or deformation, and with shorter preparation times.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Achieving full working length (FWL) in curved root canals is crucial for effective endodontic treatment.
- Reciprocating instruments offer potential advantages in navigating complex root canal anatomy.
Purpose of the Study:
- To compare the efficacy of Reciproc Minima (20 and 25) and Reciproc Blue R25 instruments in reaching the FWL in mesial canals of mandibular molars.
- To evaluate instrument safety (fracture, deformation) and preparation time.
Main Methods:
- 330 mesial canals from mandibular molars (0°-20° curvature) were divided into three groups: Reciproc Blue R25, Reciproc Minima 25, and Reciproc Minima 20.
- No prior scouting or glide path preparation was performed.
- Instruments were used in a reciprocating motion; if initial instruments failed, smaller Reciproc Minima instruments were tested.
Main Results:
- Reciproc Minima 20 achieved the highest FWL success rate (96.36%), followed by Reciproc Minima 25 (83.64%) and Reciproc Blue R25 (70.91%).
- Reciproc Minima 20 successfully reached the FWL in canals where larger instruments failed.
- No instrument fractures occurred, and deformation rates were low and comparable across groups. Preparation time was shortest with Reciproc Minima 20.
Conclusions:
- Reciproc Minima instruments exhibit superior mechanical scouting ability in mesial canals of mandibular molars compared to Reciproc Blue R25.
- Reciproc Minima 20 is highly effective for reaching FWL in challenging canals, offering efficiency and safety.