| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Next Generation Biomaterials
|
| Presentation Title |
Influence of Surface Finishing on Fatigue Life of NiTi Wire and Endodontic Instruments |
| Author(s) |
Carlos Nelson Elias, Ivi Costa Rocha dos Santos, Julianna Magalhães Garcia, Victor Vieira Talarico Leal |
| On-Site Speaker (Planned) |
Carlos Nelson Elias |
| Abstract Scope |
NiTi alloys are used to manufacture endodontic instruments for dental root canal treatment. During mechanical cleaning of root canals, these instruments are subjected to cyclic loading and may fracture after only 1 to 5 min of use. One of the reasons for early fracture is the existence of machining grooves from the manufacturing process on the instrument's surface. This study investigates the fatigue behavior of NiTi wires and endodontic instruments under cyclic loading, focusing on the influence of surface roughness, microstructure, phase transformation, and mechanical properties. Fatigue tests were conducted on NiTi wires with grooves at different angles relative to the longitudinal direction (0o, 30o, 60o, and 90o). NiTi wires with grooves in the 30° direction showed the lowest resistance to fatigue fracture. The conclusion is that instrument surface finishing is essential to improve fatigue life and assure patient safety. |