Assessment of fracture resistance of mesial roots of mandibular molars prepared by NiTi rotary files of different tapers and alloys (A Comparative in-vitro study)

Document Type : Original Article

Authors

1 MSc Student, Endodontic Department, Faculty of Dentistry, Minia University

2 Lecturer of Endodontics, Faculty of Dentistry, Minia University

3 Associate Professor, Department of Endodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt

Abstract

Objective: the objective of the current study was to compare fracture resistance of mesial roots of mandibular first molars prepared by ProTaper Next (PTN; Dentsply Sirona, Ballaigues, Switzerland) and Race Evo (RE; FKG Dentaire SA, La Chaux-de- Fonds, Switzerland) at different tapers. Materials and methods:
44 freshly extracted mature intact human mandibular molars that were free of cracks or fractures were selected. After decoronation and distal root separation samples were randomly allocated into one control group unprepared and three experimental groups according to the system used for mesiobuccal root canal preparation as follows; Group (I) was prepared using the ProTaper Next up to X3 (30/07), and Group (II) was prepared using RaCe EVO up to 30/04. Group (III) was prepared using RaCe EVO up to 30/06. Then samples were mounted into acrylic blocks with periodontal ligament simulation and subjected to fracture resistance test utilizing the universal testing machine. Results: The control group showed statistically highest resistance to fracture (P-value <0.001, Effect size = 0.839). Comparison between experimental groups showed that RaCe EVO 4% group had the highest resistance to fracture followed by RaCe EVO 6% group and the ProTaper Next group showed the lowest resistance to fracture. Conclusion: It could be concluded that decreasing root canal preparation taper increased root resistance to fracture also fixed taper preparation had higher root resistance to fracture than progressive taper preparation.

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Egyptian Dental Journal
Volume 70, Issue 1 - Serial Number 5
January (Conservative Dentistry and Endodontics)
January 2024
Pages 809-814

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