Background. Rough, poorly polished surfaces contribute to staining, plaque accumulation, gingival irritation and recurrent caries. Finishing and polishing techniques are critical factors contributing to the longevity of the direct composite resin restorations. Objectives. The aim of this in vitro study was to evaluate the effects of finishing and polishing systems on surface roughness of six nanocomposite restorative resins. Material and Methods. Thirty specimens of each restorative material (n = 180) were placed in a teflon mould (6 mm in diameter and 3 mm in depth) and cured with a LED curing unit. Six specimens from each of restorative material were randomly assigned to four groups for finishing and polishing (carbide burs, diamond burs, aluminium oxide discs, silicon rubber polisher) techniques. Mylar strip formed specimens were served as control group. After finishing and polishing procedures surface roughness was evaluated by a profilometer. The data was analyzed by 2-way analysis of variance and the Tukey HSD test (α = 0.05). Results. Significant differences were found between the groups in terms roughness (p < 0.001). The control group and aluminium oxide discs group had the lowest Ra values and were significantly different from other groups (p < 0.001). The roughest surface was obtained with diamond burs followed by silicon rubbers and carbide burs. Overall, the smoothest surfaces were obtained with the use the complete sequence of aluminum oxide discs. Conclusions. In areas that could not be reached by the aluminum oxide discs, the carbide burs produced satisfactory surface smoothness for the nanocomposite restorative materials. Although mylar matrix strip formed surfaces presents lower surface roughness values, recountouring and polishing of resin restorations are often required in clinical situations. Aluminium oxide discs and carbide finishing burs are suitable for finishing and polishing procedures for nanocomposite restorative resins (Adv Clin Exp Med 2015, 24, 5, 881-890).
ObjectiveThe aim of this study was to evaluate the effect of neutral sodium fluoride (NNaF)
gel and acidulated phosphate fluoride (APF) gel on the surface roughness of
colored compomer (Twinky Star), conventional compomer (Compoglass F) and
resin-modified glassionomer cement (RMGIC) (Photac-Fil).Material and MethodsA total of 45 standardized disc-shaped specimens were prepared for each material.
After 24 h, finishing and polishing of specimens were done with aluminum oxide
disc. Surface treatments with topical fluoride agents or distilled water (control)
were performed four times, and interspersed with 8 pH cycles, simulating high
cariogenic challenges. After the treatment, the surface roughness (Ra) was
determined using a profilometer. In each group, specimens with Ra closest to the
mean were examined with a scanning electron microscope (SEM) at ×1,000 and ×3,500
magnifications. Two-way ANOVA was used to evaluate Ra measurements, and the
differences in Ra values between subgroups for each material and each topical
applications were compared by Tukey’s highly significant difference pairwise
comparisons.ResultsNo statistically significant difference in Ra between the Twinky Star and
Compoglass F was found. However, Photac Fil showed significantly higher Ra than
these materials after all surface treatments. There was a general trend of Ra
increase from controls to NNaF and APF gels for all materials. SEM observations
revealed that the surface micromorphology of Twinky-Star did not differ
significantly from that of Compoglass F.ConclusionBoth the compomers and the RMGIC showed significantly higher surface roughness
when subjected to APF gel application.
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