Translucency of New Lithium Disilicate Ceramics After Ageing and Immersion in Coffee Solution

Aim To evaluate translucency parameters of different lithium disilicate glass-ceramic materials after thermocycling and coffee staining. Material and method Three different rectangular-shaped specimens were prepared using three distinct 1.2 mm thick lithium disilicate glass ceramics (IPS e.max CAD, LD_C; Cerec Tessera, LD_A; Initial LiSi Block, LD_F) by using a precision cutting device. All specimens were standardised by polishing with abrasive silicone paper. Thereafter, the specimens were subjected to thermal cycling (5000 cycle, 5-55 C, 30 sn dwell time) and then immersed in coffee solution for 30 days. The colour coordinates of each sample before and after ageing were recorded, and the relative translucency parameter (RTP) was calculated using the CIEDE 2000 formula. The results were then subjected to statistical analysis by one-way ANOVA and a post hoc Tukey test. Results There was a significant difference between the groups in terms of RTP both before and after staining (p