Effects of clinical use and sterilization on surface topography and surface roughness of three commonly used types of orthodontic archwires.

Isac, Joji; Chandrashekar, B S; Mahendra, S; Mahesh, C M; Shetty, Bala Mohan; Arun, A V

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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