Color Change Of Relined Dentures After Disinfection: A Clinical Trial

Objective: The purpose of this in vivo study was to evaluate the effect of chemical disinfection (Chlorexidine Digluconate 2% and Sodium Perborate) on the color stability of hard chairside reline resin after 15 days service period. Methods: Forty Five adult patients, who required denture reline treatment, were included in this study. Tokuyama Rebase II was used to reline complete maxillary dentures. Adaptation of each denture was examined and the surface to be relined was reduced with of a rotary cutting instrument. The relining material was prepared, poured into the relining area, inserted and adjusted after setting. The edentulous subjects were randomly divided into 3 groups (n=15), according disinfection method: CG (control group) - brushing with coconut soap and soft toothbrush; PG (Perborate group) - brushing according to previous methods and disinfection with sodium perborate (Corega Tabs) for 5 minutes once a day during the evaluation period (15 days) and ChxG (Chlorhexidine Grup) - brushing according to CG and disinfection with chlorhexidine digluconate 2% for 5 minutes once a day during the evaluation period. Color parameters in L*a*b* were recorded with a spectrophotometer. Each relined denture was subjected to baseline evaluation and after 7 and 15 days. Based on the L*a*b* values the color difference (ΔE) was calculated. Data were analyzed using Anova and Tukey tests (p=0.05). Results: The reline material showed color changes (ΔE) from 1.64 to 4.26. Analysis of variance with repeated measures on ΔE identified significant effect of main factor time (p <0.001) but not the method of disinfection (p = 0.298). The results demonstrated that the color change values of 7 days after disinfection were significantly lower than those of 15 days. Conclusion: The color of Tokuyama Rebase II was affected independent of the disinfection method used after 7 days observation period. Grants: FAPESP-2010/00916-7