2020 Volume 64 Issue 4 Pages 373-379
Purpose: This study aims to investigate the effect of mechanical and chemical cleaning on the surface
roughness ofPurpose: silicone soft relining materials.
Methods: We selected silicone soft relining materials with the highest (Soft) and lowest (Supersoft) Shore
A hardness. In the abrasion test, specimens were cleaned 50,0 0 0 times using a kitchen sponge (Sponge),
a soft (Soft brush) or hard (Hard brush) denture brush, or stored in water (No cleaning). In the immer-
sion test, specimens were immersed in either water (Water), neutral peroxide denture cleanser (Neutral),
alkaline peroxide denture cleanser (Alkaline), or hypochlorite denture cleanser (Hypochlorite) for 1440 h.
Surface roughness of the arithmetic mean height of the surface (Sa) and maximum height (Sz) were
measured before and after the tests. Data were analyzed using the Kruskal–Wallis and Mann–Whitney U
tests.
Results: In the abrasion test, significant differences were observed for Sa and Sz with Soft relining ma-
terials, but not for No cleaning and Sponge. In the immersion test, significant differences were observed
for Sa and Sz with Soft relining materials, but not between Water and Neutral or Water and Alkaline.
Significant differences were observed with Supersoft, except between Water and Neutral or Water and
Alkaline for Sa and between Water and Neutral for Sz.
Conclusions: Mechanical cleaning using a sponge did not increase the surface roughness of the mate-
rial with a high Shore A hardness. Furthermore, neutral peroxide denture cleanser did not increase the
roughness of materials with high and low Shore A hardness.
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