Evaluation of Surface Roughness and Color Stability of Fluorapatite/Hydroxyapatite-Containing Glass Carbomer Filling Material

Abstract

Background: This study was designed to determine the effects of various finishing and polishing systems on the surface roughness and color stability of a glass carbomer filling material containing fluorapatite/hydroxyapatite particles. Materials and Methods: A glass carbomer filling material (with and without protecting coat [gloss] n = 100) and a microhybrid resin-based composite (n = 50) were tested in the study. No finishing and polishing was applied to ten samples for each material. The remaining samples were finished and polished with OneGloss, Enhance/PoGo, Identoflex, and Sof-Lex discs, and stored in a coffee solution. Surface roughness assessments were made with a profilometer. Color measures (L* a* b*) were calculated with a colorimeter on the periods of different staining procedures. For the data analysis, two-way analysis of variance was employed. For multiple comparisons, Bonferroni adjustment was used (P < 0.05). Results: The lowest and highest Ra values were found in the group of microhybrid resin-based composite with Mylar strip (0.17 ± 0.04, P < 0.05) and in the group of glass carbomer with gloss with Mylar strip (1.17 ± 0.30, P < 0.05), respectively. The ΔE* and ΔL* values of the glass carbomer with gloss were higher than the other groups. The microhybrid resin-based composite showed less change in all parameters. Conclusion: The results showed that the glass carbomer did not provide a high level of color stability and surface roughness like the microhybrid resin-based composite. On the other hand, the glass carbomer material was affected negatively by the gloss application.