Camelia  Szuhanek, Rodica Jianu, Lorena Circiumaru, Meda Negrutiu, Cosmin Sinescu, Cezar Serban Clonda, Eleonora Schiller, Adelina Popa, Adelina Grigore<br>Microstructural Changes in Orthodontic Arch-wires after Alternative Bending Techniques

Camelia Szuhanek, Rodica Jianu, Lorena Circiumaru, Meda Negrutiu, Cosmin Sinescu, Cezar Serban Clonda, Eleonora Schiller, Adelina Popa, Adelina Grigore
Microstructural Changes in Orthodontic Arch-wires after Alternative Bending Techniques

Abstract:

Nowadays the straight-wire philosophy is the most common technique used in orthodontics. Even so, minor bends are required when it comes to the finishing phase of the case. For the finishing phase, but also for different biomechanical purposes, more types of wires can be used: NiTi, BT 3 Titan, Titanol, SS. The microstructural surface changes that occur after wire-bending can sometimes become vital to the orthodontic treatment. Mechanical characteristics, tensile strength, yield strength and elongation at break were analyzed in order to select the best arch-wire for different orthodontic purposes (alignment, stability, arch form). The tensile strength of the arch-wires was appreciated after a number of alternative bending cycles, by analyzing the microstructural changes with the use of an AM4515T8 microscope (900 x magnification). A statistical analysis was performed after testing a 0.16 NiTi wire, a BT3 BetaTi wire, Titanol Arcs, S304 SS Lingual, and a M5NiTi lingual large wire. Key words: surface microstructural deformation, NiTi wire, tensile strength, yield strength

Issue: 2016, Volume 67, Issue 11

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