Evaluation of the mechanical properties of flat 25.04 rotary instruments made with different heat treatments

• Grant number: 23/04745-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2023
• End date: June 30, 2024
• Field of knowledge: Health Sciences - Dentistry - Endodontics
• Principal Investigator: Murilo Priori Alcalde
• Grantee: Lais Ciffoni Alves
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

The aim of this study was to evaluate the cyclic, torsional and bending resistance of two NiTi rotary instruments 25.04 manufactured by Gold (Flat File 25.04 - MK Life, Porto Alegre, Brazil) and Blue (Prototype instruments 25.04 - Mk Life, Porto Alegre, Brazil) with flat design.The cyclic fatigue test will be performed in artificial canal with 600 angle and 5 mm radius of curvature to evaluate the time and number of cycles to instrument fracture. This test will be performed simulating the body temperature (n=10). The torsional test will use a total of 20 instruments (n=10), according the ISO 3630-1. This test will evaluate the torsional strength (N.cm) and angular deflection (º) to instruments fracture at 3 mm from the tip. Also, the bending resistance 600 will evaluate the bending force (g.f) at 5 mm from the tip (n=10). After the cyclic and torsional test, the instruments will be evaluated by Electron Scanning Microscopy to analyze the topographic features of the fractured surfaces. Then, the obtained data will be statically analyzed.