Dynamic analysis of a NiTi rotary file by using finite element analysis: Effect of cross-section and pitch length.

Autor: Akkoç Hİ; Mechanical Engineering Department, Faculty of Technology, University of Afyon Kocatepe, Afyon, Turkey., Keskin C; Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey., Aslantaş K; Mechanical Engineering Department, Faculty of Technology, University of Afyon Kocatepe, Afyon, Turkey.
Jazyk: angličtina
Zdroj: Australian endodontic journal : the journal of the Australian Society of Endodontology Inc [Aust Endod J] 2024 Dec; Vol. 50 (3), pp. 649-657. Date of Electronic Publication: 2024 Oct 03.
DOI: 10.1111/aej.12892
Abstrakt: This study assessed stress distribution, maximum stress values and fatigue life of experimentally designed NiTi rotary files with different cross-sectional geometry and pitch length using finite element analysis (FEA). Four cross-sectional shapes (Convex triangle, S-shaped, Triple helix and Concave triangle) and two pitch lengths (2 mm and 3 mm) were tested in simulated root canals with curvatures of 30°, 45° and 60°. The FEA results indicated that convex triangle and triple helix geometries exhibited lower stress values compared to the S-shaped and concave triangle designs. Increasing the canal curvature angle resulted in higher stress values, with the S-shaped instrument showing the most significant increase (up to 12%). Instruments with shorter pitch lengths showed more even stress distribution enhancing fatigue life. The maximum stress was concentrated 5-8 mm from the tip, varying across cutting edges, with S-shaped sections experiencing the lowest forces but higher stress due to lower moments of inertia.
(© 2024 Australian Society of Endodontology Inc.)
Databáze: MEDLINE
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