Comparative analysis of load/deflection ratios of conventional and heat-activated rectangular NiTi wires

Abstract

OBJECTIVE: This study compared the load-deflection ratios between 0.019 x 0.025-in rectangular orthodontic wires using 5 conventional preformed nickel-titanium (NiTi) and 5 heat-activated NiTi archwires from four different manufacturers (Abzil, Morelli, 3M Unitek and Ormco), totaling 40 archwires. The archwires were placed in typodonts without tooth # 11 and tested using a universal testing machine connected to a computer. RESULTS: The comparisons of mean load-deflection values of conventional NiTi wires revealed that the lowest mean-deflection ratio was found for 3M Unitek, followed by Ormco, Morelli and Abzil. Regarding the heat-activated wires, the lowest load-deflection ratio was found for Ormco, followed by 3M Unitek, Abzil, and Morelli. CONCLUSION: The comparison of mean load-deflection ratios revealed that the heat-activated wires had lowest mean load-deflection ratios, and this trend was seen during all the study. However, at 2-mm deflection, mean load-deflection ratios for heat-activated Morelli and conventional 3M Unitek wires were very similar, and this difference was not statistically significant

Farklı Nikel-Titanyum Teller Tarafından Uygulanan Kuvvet Miktarının Ölçülmesi

“…NiTi ark tellerinin en önemli mekanik karakteristik özelliklerinden biri şekil hafızası özelliğidir. Materyal deforme olsa bile eksiksiz düzelme gösterir ve bu özellik sayesinde klinisyene alaşımın uzun süre deforme kalınlığı ve sertliğinin uyguladıkları kuvvet miktarını doğrudan etkilediği sonucuna varılmıştır (16). Bizim çalışmamızda da buna paralellik gösteren sonuçlar elde edilmiştir.…”

“…Beş farklı ticari markanın (3M, American Orthodontics, Dentaurum, SIA ve ODP) 3 farklı kalınlıktaki (0,12/0,14/0, 16) kalınlığı ve sertliğinin uyguladıkları kuvvet miktarını doğrudan etkilediği sonucuna varılmıştır (16). Bizim çalışmamızda da buna paralellik gösteren sonuçlar elde edilmiştir.…”

Comparative analysis of plastic deformation of NiTi and CuNiTi wires submitted to mechanical cycling

“…Within the range of archwires existent on the market, the NiTi type are those that release lighter forces when compared with the other archwires [4,9], and may be presented in the conventional superelastic [6,24,25] or thermoactivated [20,26,27] form, with 55% nickel and 45% titanium [28]. Whereas, the CuNiTi archwires that may also be classified as being thermoactivated (tensoactive) and superelastic, are basically composed of nickel, titanium and copper, on an average, presenting, 50%, 44% and 6%,respectively, of these chemical elements [2,4,29].…”