Color stability, roughness, and water sorption/solubility of glass ionomeruBased restorative materials

Objectives: The aim of this study was to investigate the effects of various drinks on color stability and roughness of glass ionomer cementubased/ucontaining restorative materials and water sorption/solubility behavior of them. Materials and Methods: A total of 130 specimens for each material (GC Equia, GCP Glass Fill, Ketac N100, Glasiosite; a total of 520) were prepared using a Tefl on ring (7 x 2 mm). After specimen preparations, baseline color and surface roughness measurements were performed using a spectrophotometer and surface profi lometer, respectively. Specimens were immersed in four different solutions (n = 15; distilled water, cola, orange juice, and chocolate milk) during the 28-day test period. The immersion media were renewed daily. Color and surface roughness measurements were repeated at 1(st), 7(th), and 28(th) days. For water sorption, specimens (n = 15) were immersed in 10 mL of distilled water in individual containers and weighed at 1(st) week, 14(th), and 28(th) days. After a total immersion time of 28 days, the specimens were dried to a constant mass, in a desiccator for 28 days. Each specimen was measured using a digital electronic caliper. Data were statistically analyzed (P < 0.05). Results: After 28 days, the highest E* value was calculated in GCP Glass Fill immersed in chocolate milk (10.54 0.69). All the tested materials showed signifi cantly higher Ra values compared with baseline scores after immersion in various beverages regardless of the immersion solutions used (P < 0.05). Glasiosite showed the smallest water sorption (16.75 mg/mm(3)) among the tested materials, whereas Ketac N100 (155.41 mg/mm(3)) and GCP Glass Fill (161.01 mg/mm(3)) had the highest. Conclusions: The compositions of restorative materials play key roles in their color stability, surface roughness, and water sorption/solubility.