Surface changes in denture soft liners with and without sealer coating following abrasion with mechanical brushing

Autor: Vivian Chiada Mainieri, Luciana Mayumi Hirakata, Rosemary Sadami Arai Shinkai, Hugo Mitsuo Silva Oshima, Joaquim Beck
Rok vydání: 2010
Předmět:
Zdroj: Gerodontology. 28:146-151
ISSN: 0734-0664
1741-2358
DOI: 10.1111/j.1741-2358.2010.00375.x
Popis: Gerodontology 2010; doi: 10.1111/j.1741-2358.2010.00375.x Surface changes in denture soft liners with and without sealer coating following abrasion with mechanical brushing Aim: To evaluate the surface alterations of soft liners with or without sealer coating following abrasion with mechanical brushing. Methods: Thirty specimens were made of a methacrylate- (Coe-Soft) and a siloxane-based material (Ufi-Gel SC), and 15 received two coatings of surface sealer. The specimens were submitted to a mechanical brushing-dentifrice assay under 200 g of force at 250 cycles/min. Mechanical brushing was simulated for a period of 1 (1250 cycles) and 6 months (5000 cycles). Surface roughness (Ra parameter) was measured, and scanning electron microscopy (SEM) images were obtained. Ra data were analysed by anova for repeated measures and Bonferroni’s test (alpha = 0.05). Results: Ra increased from baseline to 6 months regardless of sealer coating. At baseline, only Coe-Soft without sealer had a higher Ra than the other groups. After 1 month, the Ra of Coe-Soft with sealer was three-fold higher than the Ra at baseline; the other groups showed no significant increase of Ra. SEM images showed degradation of the soft liners over time, except for the Ufi-Gel SC with sealer, which displayed minimum alteration of surface texture. Conclusion: Sealer coating reduced the surface degradation of the tested soft liners, but the protective effect was more pronounced for the siloxane-based material.
Databáze: OpenAIRE
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