EFFECT OF COLD DEFORMATION ON SUPERELASTICITY AND MORPHOLOGY OF FOUR ORTHODONTIC NITINOL WIRES

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SADRNEZHAD S.K.; TAVABI A.H.; GHOREYSHI S.

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Journal: IRANIAN JOURNAL OF BIOMEDICAL ENGINEERING Year:2005 | Volume:1 | Issue:2 Page(s): 181-191

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Title

EFFECT OF COLD DEFORMATION ON SUPERELASTICITY AND MORPHOLOGY OF FOUR ORTHODONTIC NITINOL WIRES

Author(s)

SADRNEZHAD S.K. | TAVABI A.H. | GHOREYSHI S. | Issue Writer Certificate

Keywords

ORTHODONTIC WIREQ4

SUPERELASTICQ4

NITINOLQ4

R PHASEQ4

STRESS HYSTERESISQ4

Abstract

Tooth straightening with SUPERELASTIC wire requires exertion of continued bending as well as tensional forces exerted by the wires to the teeth. The applied force can influence on properties of the wire. Knowing the amount and mechanism of this change results in both improvement of the clinical operation as well as the recovery of the used alloy. Investigating the possibility of exertion of a stable force during the curing period is substantial to orthodontists. Studying the possibility of recovery and re-circulation of the used material is of interest to engineers. The latest results obtained on the effect of bending on transformation temperatures, crystal structure and mechanical properties of four different orthodontic commercial wires are discussed in this paper. It is seen that the width of the hysteresis loop is reduced, percentage of the marten site phase is increased and the possibility of stress induced Rphase formation is increased due to the application of the deflection strains on the samples. The structural phase change occurring during mechanical and/or heating operations indicates that the alloy property can change from SUPERELASTIC towards shape memory effect via heat treatment after cold working. Microstructural and transformation temperature studies show that R-phase formation is concomitant with the presence of marten site in the wires. These results indicate that the SUPERELASTIC effects are correlated to the formation and elimination of small forcible hysteresis loop of the R PHASE.

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APA: Copy

SADRNEZHAD, S.K., TAVABI, A.H., & GHOREYSHI, S.. (2005). EFFECT OF COLD DEFORMATION ON SUPERELASTICITY AND MORPHOLOGY OF FOUR ORTHODONTIC NITINOL WIRES. IRANIAN JOURNAL OF BIOMEDICAL ENGINEERING, 1(2), 181-191. SID. https://sid.ir/paper/81721/en

Vancouver: Copy

SADRNEZHAD S.K., TAVABI A.H., GHOREYSHI S.. EFFECT OF COLD DEFORMATION ON SUPERELASTICITY AND MORPHOLOGY OF FOUR ORTHODONTIC NITINOL WIRES. IRANIAN JOURNAL OF BIOMEDICAL ENGINEERING[Internet]. 2005;1(2):181-191. Available from: https://sid.ir/paper/81721/en

IEEE: Copy

S.K. SADRNEZHAD, A.H. TAVABI, and S. GHOREYSHI, “EFFECT OF COLD DEFORMATION ON SUPERELASTICITY AND MORPHOLOGY OF FOUR ORTHODONTIC NITINOL WIRES,” IRANIAN JOURNAL OF BIOMEDICAL ENGINEERING, vol. 1, no. 2, pp. 181–191, 2005, [Online]. Available: https://sid.ir/paper/81721/en

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