Deflection Evaluation of Thermoactivated Nickel-Titanium Archwires after Heat Treatment on their Distal Ends.

Autor:	Bramante FS; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Fonseca Junior FM; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Pinzan-Vercelino CR; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Gurgel Jde A; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Tavarez RR; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Filho EM; Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Brazil., Tonetto MR; Department of Post-Graduate Program in Integrated Dental Sciences, University of Cuiabá, Cuiabá, Brazil., Borges AH; Department of Post-Graduate Program in Integrated Dental Sciences, University of Cuiabá, Cuiabá, Brazil., Bandéca MC; Professor, Department of Post-Graduate Program in Dentistry, CEUMA University, Sao Luis, Maranhão, Rua Josue Montello, n 01, Renascença, São Luis, Maranhão-84035-210, Brazil, e-mail: mbandeca@gmail.com.
Jazyk:	angličtina
Zdroj:	The journal of contemporary dental practice [J Contemp Dent Pract] 2015 Feb 01; Vol. 16 (2), pp. 91-5. Date of Electronic Publication: 2015 Feb 01.
DOI:	10.5005/jp-journals-10024-1642
Abstrakt:	Objective: This study evaluated in vitro the mechanical changes of 0.018" (0.45 mm) and 0.016 × 0.022" (0.40 × 0.55 mm) thermoactivated nickel-titanium archwires subjected to heat treatment on their distal ends. Materials and Methods: Ten archwires in diameters 0.018" and 0.016 × 0.022" by different manufacturers Ormco, Morelli, Orthometric and Unitek were tested. Each tested archwire had an experimental side, submitted to heat treatment, and an annealing-free control. Tests for load/deflection were performed using a universal testing machine, with temperature control in the austenitic transformation phase through tempe rature-controlled chamber. The variables showed normal distribution (Kolmogorov-Smirnov), the t-student test was applied in order to observe the difference between the experi mental and control groups. Statistical significance was set at p < 0.05. Results: There were no statistically significant differences between the groups. Conclusion: Heat treatment carried out in the region corresponding to the first molar distal region on thermoactivated nickel-titanium archwires did not influence the load/deflection values in adjacent portion.
Databáze:	MEDLINE
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