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Aim: To evaluate and compare the shade of zirconia and alumina crowns over composite, all-ceramic and metal core material. Objectives: (1) To evaluate the influence of composite core build-up material on the shade of zirconia and alumina crowns. (2) To evaluate the influence of all-ceramic core material on the shade of zirconia and alumina crowns. (3) To evaluate the influence of metal core material on the shade of zirconia and alumina crowns. (4) To compare the influence of composite, all-ceramic and metal core material on the shade of zirconia and alumina crowns. Materials and methods: The all-ceramic materials used for fabrication of crowns were zirconia (LAVA) and alumina (PROCERA). They were evaluated spectrophotometrically for the change in shade when placed over three core build-up materials. Results: The observations obtained were statistically analyzed by analysis of variance. Zirconia crowns when compared with alumina crowns showed the least shade change when placed on the three core materials. Among the three core materials used, composite core build-up material showed the least change in the shade.

A Comparative Shade Evaluation of Two Different All-Ceramic Materials over Three Core Build-up Materials: An in vitro Study