Cyclic fatigue resistance, torsional resistance, and metallurgical characteristics of M3 Rotary and M3 Pro Gold NiTi files
Pedulla Eugenio, Savio Fabio Lo, La Rosa Giusy Rita Maria, Miccoli Gabriele, Bruno Elena, Rapisarda Silvia, 장석우, Rapisarda Ernesto, Rosa Guido La, Gambarini Gianluca, Testarelli Luca,
소속 상세정보
( Pedulla Eugenio ) - University of Catania Department of General Surgery and Medical-Surgical Specialties
( Savio Fabio Lo ) - University of Catania Industrial Engineering
( La Rosa Giusy Rita Maria ) - University of Catania Department of General Surgery and Medical-Surgical Specialties
( Miccoli Gabriele ) - La Sapienza University Department of Endodontics
( Bruno Elena ) - University of Catania MATIS IMM-CNR and Department of Physics
( Rapisarda Silvia ) - University of Catania Department of General Surgery and Medical-Surgical Specialties
장석우 ( Chang Seok-Woo ) - Kyung hee University School of Dentistry Department of Conservative Dentistry
( Rapisarda Ernesto ) - University of Catania Department of General Surgery and Medical-Surgical Specialties
( Rosa Guido La ) - University of Catania Industrial Engineering
( Gambarini Gianluca ) - La Sapienza University Department of Endodontics
( Testarelli Luca ) - La Sapienza University Department of Endodontics
Abstract
Objectives: To evaluate the mechanical properties and metallurgical characteristics of the M3 Rotary and M3 Pro Gold files (United Dental).
Materials and Methods: One hundred and sixty new M3 Rotary and M3 Pro Gold files (sizes 20/0.04 and 25/0.04) were used. Torque and angle of rotation at failure (n = 20) were measured according to ISO 3630-1. Cyclic fatigue resistance was tested by measuring the number of cycles to failure in an artificial stainless steel canal (60° angle of curvature and a 5-mm radius). The metallurgical characteristics were investigated by differential scanning calorimetry. Data were analyzed using analysis of variance and the Student-Newman-Keuls test.
Results: Comparing the same size of the 2 different instruments, cyclic fatigue resistance was significantly higher in the M3 Pro Gold files than in the M3 Rotary files (p < 0.001). No significant difference was observed between the files in the maximum torque load, while a significantly higher angular rotation to fracture was observed for M3 Pro Gold (p < 0.05). In the DSC analysis, the M3 Pro Gold files showed one prominent peak on the heating curve and 2 prominent peaks on the cooling curve. In contrast, the M3 Rotary files showed 1 small peak on the heating curve and 1 small peak on the cooling curve.
Conclusions: The M3 Pro Gold files showed greater flexibility and angular rotation than the M3 Rotary files, without decrement of their torque resistance. The superior flexibility of M3 Pro Gold files can be attributed to their martensite phase.
키워드
Cyclic fatigue; Differential scanning calorimeter; Heat-treatment; M3 Pro Gold; M3 Rotary; Torsional resistance
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