Effects of clinical use and sterilization on surface topography and surface roughness of three commonly used types of orthodontic archwires.
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Date
2015-07
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Abstract
Aim: To evaluate the changes in surface topography and roughness of stainless steel (SS),
nickel‑titanium and beta‑titanium (β‑Ti) archwires after clinical use and sterilization.
Settings and Design: Thirty wires each of SS, nitinol, and β‑Ti (3M Unitek) were tested in as
received, as received and autoclaved, and clinically retrieved then autoclaved conditions.
Materials and Methods: A sterilization protocol of 134°C for 18 min was performed using
an autoclave. Surface topography of specimens from each subgroup was examined using an
environmental scanning electron microscope (ESEM model Quanta 200, The Netherlands) at ×100,
×1000, and ×2500 magnifications. Surface roughness was measured using arithmetic mean
roughness (Ra) values obtained from optical profilometric scanning (Taylor Hobson, Leicester, UK).
Statistical Analysis: Data were analyzed by one‑way analysis of variance and Tukey’s post‑hoc
procedures.
Results: Scanning electron microscope images revealed an increase in surface irregularities
in SS and nitinol wires after clinical use. There was a significant increase in Ra values of SS
orthodontic wires after intra‑oral exposure (P = 0.0002).
Conclusion: Surface roughness of SS wires increased significantly after clinical use. Autoclave
sterilization did not affect considerably on surface characteristics of any archwire.
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Keywords
Orthodontic archwires, surface roughness, surface topography
Citation
Isac Joji, Chandrashekar B S, Mahendra S, Mahesh C M, Shetty Bala Mohan, Arun A V. Effects of clinical use and sterilization on surface topography and surface roughness of three commonly used types of orthodontic archwires. Indian Journal of Dental Research. 2015 July-Aug; 26(4): 378-383.