Comparison of Surface Roughness and Color Stability of Different Denture Characterizing Composite Resins: The Effect of Different Surface Treatments

Abstract

This study aimed to investigate the effect of surface treatment and type of composite resin material on the color stability and surface roughness of different denture characterizing composites. Materials and methods: Two nanohybrids [Gradia Plus Gum, (GP) and SR Nexco Paste Gingiva, (SR)] and one microhybrid gingiva-colored composite resin [Amaris Gingiva, (AG)] were investigated. A total of 120 disk-shaped samples were prepared, 40 of each material. Samples were divided into two groups (n = 20) for each material according to the surface treatment applied: conventional polishing (control) and coated with a sealant in addition to the surface polishing. All groups were thermocycled. The surface roughness (Ra) was measured using a profilometer after thermal cycling. The samples were then divided into 2 subgroups (n = 10) and stored for 7 days in distilled water or coffee solution. Color differences (ΔE 00 ) were calculated with a spectrophotometer. Results were evaluated with Kruskal-Wallis and Mann-Whitney U statistical analysis. Results:The type of denture characterizing composite material and surface treatment method revealed statistically significant differences for the ΔE 00 (after immersion both in coffee and distilled water) and the Ra values of denture characterizing composite (p < 0.001 for both). All sealed groups showed significantly higher Ra than the all polished groups. Both in the polished groups and the sealant applied groups, the GP had the highest mean Ra values (0.29 ±0.05 µm and 0.47 ±0.09 µm, respectively). It was followed by SR (0.23 ±0.06 µm and 0.41 ±0.10 µm, respectively), and AG groups (0.20 ±0.06 µm and 0.39 ±0.09 µm, respectively). According to the mean ΔE 00 results, all composite groups showed significantly higher ΔE 00 values immersed in coffee solutions compared to distilled water. In coffee solutions, the highest ΔE 00 was observed in the polished GP (1.90 ±0.40), and the lowest ΔE 00 was observed in the polished SR (0.97 ±0.36). The sealed groups showed higher ΔE 00 than the polished groups, except for GP. Conclusions: The surface roughness value of sealant applied groups were significantly higher than those of the polished groups. The surface sealant application significantly increased the staining of all composite groups compared to conventional polishing, except for GP.

Influence of Different Polishing Methods on Surface Roughness and Microhardness of Dental Composites

“…Greater retention of dental biofilm, especially in the gingival region, leads to gingivitis, but also to the dissolution of the organic matrix. All these factors may lead to the occurrence of secondary caries [26][27][28].…”

Evaluation of the Color Stability, Stainability, and Surface Roughness of Permanent Composite-Based Milled and 3D Printed CAD/CAM Restorative Materials after Thermocycling

“…For the color stability and staining test, specimens of each material were randomly divided into two subgroups depending on the immersion solutions (coffee or distilled water) (n = 10). The base color parameters of the specimens in both subgroups were measured using a spectrophotometer (VITA Easyshade V, VITA Zahnfabrik, KG, Germany) [38] according to the CIELAB system as L*, a*, b*. The color measurement of each specimen was performed three times, and the average L0*, a0*, and b0* values were recorded.…”

“…The specimens of the staining groups were then stored in distilled water as a control or coffee solution for the staining procedure. The content of a 3 g coffee was dissolved in 300 mL of boiling distilled water (Nescafѐ Gold, Nestle, ˙Istanbul, Turkey) [38]. The specimens were stored in containers with 300 mL of either distilled water or 300 mL of coffee solution for 7 days at 37 • C [40].…”