Staining- and Aging-Dependent Gloss of Cloud-Shade and One-Shade Resin Composites

Objectives: To compare gloss retention of two “cloud-shade” and two “one-shade” resin composites exposed to staining and aging.
Methods: The “cloud-shade” composites were 3M experimental composite(EX) and SimpliShade(SS) – 3 shades each(light, medium and dark), while the “one shade” composites were Admira Fusion x-tra(AD) and Venus Diamond One(VE). Polymerized composite specimens (10 mm in diameter, 2-mm thick) were polished using PoGo disks for 40 seconds. Gloss measurements were performed before and after exposure to 3.8-day staining in coffee or wine, or 150 kJ/m2 of accelerated aging (n=15 per shade), using a glossmeter. The gloss retention percentages were calculated. A two-way ANOVA was used to compare the effect of material and procedure, while a Tukey’s post hoc multiple comparison test was used to assess differences among levels within each variable (a=0.05).
Results: Refer to Table - "Gloss (GU – gloss units) (SD) of cloud-shade and one-shade resin composites before and after staining in coffee (C) and wine (W) and artificial accelerated aging (A)".
Statistically significant differences were recorded among materials, procedures, and their interactions (p<0.001). The highest gloss was recorded for SS, followed by EX, VE and AD. Gloss retention (GR%) upon staining and aging ranged from 91 and 105%.
Conclusions: Staining in coffee and wine, and artificial accelerated aging provoked material- and procedure-dependent changes in gloss-retention of cloud-shade and one-shade resin composites. However, the overall gloss retention was very high.