Surface roughness of orthodontic band cements with different compositions |
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Authors: | van de Sande Françoise Hélène Silva Adriana Fernandes da Michelon Douver Piva Evandro Cenci Maximiliano Sérgio Demarco Flávio Fernando |
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Institution: | Dental School, Federal University of Pelotas, Pelotas, RS, Brazil. |
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Abstract: | ObjectivesThe present study evaluated comparatively the surface roughness of four
orthodontic band cements after storage in various solutions.Material and Methodseight standardized cylinders were made from 4 materials: zinc phosphate cement
(ZP), compomer (C), resin-modified glass ionomer cement (RMGIC) and resin cement
(RC). Specimens were stored for 24 h in deionized water and immersed in saline (pH
7.0) or 0.1 M lactic acid solution (pH 4.0) for 15 days. Surface roughness
readings were taken with a profilometer (Surfcorder SE1200) before and after the
storage period. Data were analyzed by two-way ANOVA and Tukey''s test (comparison
among cements and storage solutions) or paired t-test (comparison
before and after the storage period) at 5% significance level.ResultsThe values for average surface roughness were statistically different (p<0.001)
among cements at both baseline and after storage. The roughness values of cements
in a decreasing order were ZP>RMGIC>C>R (p<0.001). After 15 days,
immersion in lactic acid solution resulted in the highest surface roughness for
all cements (p<0.05), except for the RC group (p>0.05). Compared to the
current threshold (0.2 µm) related to biofilm accumulation, both RC and C remained
below the threshold, even after acidic challenge by immersion in lactic acid
solution.ConclusionsStorage time and immersion in lactic acid solution increased the surface roughness
of the majority of the tested cements. RC presented the smoothest surface and it
was not influenced by storage conditions. |
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Keywords: | Resin cements Dental materials |
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