IADR Abstract Archives
Effect of repeated-firing on color-stability of CAD/CAM lithium disilicate ceramics
Objectives: To compare the color stability of three CAD/CAM lithium disilicate ceramics after repeated firings.
Methods: Square-shaped lithium disilicate specimens (n=10) were prepared according to the ISO. 6872/2015. They were IPS E.max CAD (EM), LiSi CAD (LS), and CEREC TesseraTM (TSR). Specimens were submitted to two firing cycles. The color was measured with a digital spectrophotometer on the white background according to ISO. 7491. The color difference was analyzed by two-way ANOVA at significant level of 0.05.
Results: After repeated two firing cycles, EM and TSR exhibited significant color differences at p values of 0.0006 and 0.0034, respectively. No color alteration was observed in LS (p=0.0755). Of the lithium disilicate ceramics, TSR exhibited the highest color difference, which was statistically significant difference compared to EM (p<0.00101) and LS (p=0.0002). However, no significant difference in color between EM and LS (p=0.5953).
Conclusions: LS promoted the greatest color stability after repeated firings compared to TSR and EM.
Methods: Square-shaped lithium disilicate specimens (n=10) were prepared according to the ISO. 6872/2015. They were IPS E.max CAD (EM), LiSi CAD (LS), and CEREC TesseraTM (TSR). Specimens were submitted to two firing cycles. The color was measured with a digital spectrophotometer on the white background according to ISO. 7491. The color difference was analyzed by two-way ANOVA at significant level of 0.05.
Results: After repeated two firing cycles, EM and TSR exhibited significant color differences at p values of 0.0006 and 0.0034, respectively. No color alteration was observed in LS (p=0.0755). Of the lithium disilicate ceramics, TSR exhibited the highest color difference, which was statistically significant difference compared to EM (p<0.00101) and LS (p=0.0002). However, no significant difference in color between EM and LS (p=0.5953).
Conclusions: LS promoted the greatest color stability after repeated firings compared to TSR and EM.