Akademik Veri Yönetim Sistemi
FDI World Dental Congress 2024, İstanbul, Türkiye, 12 - 15 Eylül 2024
AIM or PURPOSE:The purpose of this study was to evaluate the effects of different production techniques on the optical properties of the zirconia-reinforced lithium silicate ceramics.
MATERIALS and METHOD:30 disc-shaped (12 mm in diameter and 1.2 mm in thickness) specimens were prepared from A2 high translucent Zr-reinforced lithium silicate glass ceramic. Three experimental groups were generated as milling (VS), heat-pressing (Amb), and tempering after heat-pressing (Amb-Temp) (n=10). The surfaces of the specimens were mechanically polished, and color parameters were measured under D65 conditions. The specimens were subjected to 10000 cycles of thermocycling (5°C to 55 °C). TP (Translucency parameter), OP (Opalescence Parameter), and CR (Contrast Ratio) were calculated before and after thermocycling. Color change values (ΔE) were calculated after thermocycling. The results of the OP, TP, and CR were analyzed by using the repeated measures of ANOVA. The results of the ΔE values were analyzed by using 1-way ANOVA. The results for P<0.05 were considered as significant.
RESULTS:The repeated measures of ANOVA results showed an interaction between the material type and aging factors (P<0.05). Thermocycling affected the TP, OP, and CR values. According to 1-way ANOVA results, ceramic type had no effect on the color change values (P=0.218, P>0.05). The color change value was highest for AmbTemp (2.29 ±0.9), followed by VS (1.74 ±1.3) and Amb (1.47 ±0.9).
CONCLUSION(S):The production technique of the ZLS ceramics and thermocycling significantly affected the TP, OP, and CR values. All the tested groups had perceptible color changes; however, the color change values were within the clinically acceptable limits.