Korean J Orthod.  2000 Dec;30(6):731-738.

Three point bending test of recycled Nickel-Titanium alloy wires

Affiliations
  • 1Department of Orthodontics Dental College Seoul National University, Korea. sebastian181@hotmail.com

Abstract

The purpose of this study was to investigate the change of 3 point bending properties of various nickel titanium wires after recycling. Four types of nickel-titanium (Align: martensitic type, NiTi, Optimalloy, Sentalloy: austenitic type) wires were divided to three groups: as-received condition (T0: control group), treated in artificial saliva for four weeks (T1) and autoclaved after being treated in artificial saliva (T2). Detrimental changes were observed for the selected mechanical properties in three point bending test. Loading force at 3mm deflection, unloading force at 3mm deflection, stress hysteresis, loading force at 1mm deflection, unloading force at 1 mm deflection and stress hysteresis at 1mm deflection were calculated. The findings suggest that: 1. Align demonstrated statistically significant increase in loading force (p<0.05) and unloading force (p<0.01) at 3mm deflection after recycling(T2), but NiTi, Optimalloy and Sentalloy showed no statistically difference after recycling. 2. Align demonstrated statistically significant decrease in hysteresis(p<0.01) after recycling(T2) but NiTi, Optimalloy and Sentalloy showed no statistically significant difference after recycling. 3. All wires showed no statistically significant difference in loading force at 1mm deflection after recycling(T2). 4. Align demonstrated statistically significant decrease in unloading force in 1mm deflection (p<0.05) after recycling(T2) but NiTi, Optimalloy and Sentalloy showed no statistically difference after recycling. 5. Loading force and unloading force of T1 showed no significant change compared with those of T0, but loading force and unloading force of T2 showed significant changes compared with those of T0(p<0.05, p<0.01 respectively). 6. Align demonstrated a tendency to lose some of this pseudoelsticity in T1 and pseudoplasticity and pseudoelasticity in T2.

Keyword

nickel titanium wire; recycling; 3 point bending properties; hysteresis
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