Surface changes in denture soft liners with and without sealer coating following abrasion with mechanical brushing.
OBJECTIVE
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 200g 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.


CONCLUSIONS
Sealer coating reduced the surface degradation of the tested soft liners, but the protective effect was more pronounced for the siloxane-based material.
Department of Prosthodontics and Dental Materials, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Vivian C
VC
Mainieri
Joaquim
J
Beck
Hugo M
HM
Oshima
Luciana M
LM
Hirakata
Rosemary S
RS
Shinkai
D002119:Calcium Carbonate / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003822:Denture Liners; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D016628:Replica Techniques; D012826:Silicone Elastomers / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014099:Toothbrushing / Q000295:instrumentation*; D014100:Toothpastes / Q000737:chemistry
D020099:Coated Materials, Biocompatible; D003764:Dental Materials; D008689:Methacrylates; D012826:Silicone Elastomers; D012833:Siloxanes; D014100:Toothpastes; C483158:Ufi gel; C069457:Coe-Soft denture lining material; D002119:Calcium Carbonate