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KMID : 1035320210480010001
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Korean Society for Dental Materials
2021 Volume.48 No. 1 p.1 ~ p.14
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Color comparison of glaze-treated multi-coloured lithium disilicate and zirconia
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Hwang Byeol
Ji Jeong-Hui
Park Cheol-Soo
Shin Jae-Woo
Lee Jung-Hwan
Lee Min-Ho
Bae Tae-Sung
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Abstract
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The purpose of this study was to investigate the effect of glazing treatment of multi-colored zirconia disc and lithium disilicate block on the optical properties. From an Ultra Translucent Multi-Layered (UTML) disc containing 50% cubic crystal and a lithium disilicate-based Amber Mill Direct (AMD) block, the 1.2 mm thick specimens of the upper layer (T), the center (M), and the lower layer (B) were prepared. Three types of paste glaze of InSync Glaze Paste, IPS E.max Ceram Glaze Paste, and Amber Ceram G7 Glaze Paste were applied and fired to a uniform thickness on the surface of the specimen. CIE L*, a*, b* values were measured using a spectrophotometer and contrast and translucency were calculated. The bonding interface with the glaze layer was observed using HR FE-SEM. In the glazed groups, L* value increased, but a* value and b* value decreased. The translucency value measured in the untreated group was statically higher in the AMD groups than in UTML groups (P<0.05). The translucency did not show a significant difference before and after glazing treatment in the UTML group (P>0.05), but significantly decreased compared to the untreated group after glazing treatment in the AMD group (P<0.05). The contrast ratios generally increased after glaze treatment compared to the untreated group. Since the glaze treatment can affect the optical properties of ceramic restorations, the choice of glaze should be considered important for the desired color by the dental technician.
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KEYWORD
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Zirconia, Lithium disilicate, Optical properties, Glaze
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