SciELO - Scientific Electronic Library Online

vol.22 issue2Serum leveis of inflammatory markers in type 2 diabetes patients with chronic periodontitisBacteriological analysis of necrotic pulp and fistulae in primary teeth author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Journal of Applied Oral Science

Print version ISSN 1678-7757


SPINI, Tatiana Sobottka et al. Transition temperature range of thermally activated nickel-titanium archwires. J. Appl. Oral Sci. [online]. 2014, vol.22, n.2, pp.109-117. ISSN 1678-7757.


The shape memory resulting from the superelasticity and thermoelastic effect is the main characteristic of thermally activated NiTi archwires and is closely related to the transition temperature range (TTR). The aim of this study was to evaluate the TTR of thermally activated NiTi archwires commercially available.

Material and Methods:

Seven different brands of 0.019"x0.025" thermally activated nickel-titanium archwires were tested as received by differential scanning calorimetry (DSC) over the temperature range from -100°C to 150°C at 10°C/min.


All thermally activated NiTi archwires analyzed presented stage transformation during thermal scanning with final austenitic temperature (Af) ranging from 20.39°C to 45.42°C. Three brands of NiTi archwires presented Af close to the room temperature and, this way, do not present properties of shape memory and pseudoelasticity that are desirable in clinical applications.


The thermally activated NiTi archwires present great variability in the TTR and the elastic parameters of each NiTi archwire should be provided by the manufacturers, to allow achievement of the best clinical performance possible.

Keywords : Differential thermal analysis; Orthodontic wires; Materials testing. Nickel; Titanium.

        · text in English     · English ( pdf )