Korean J Dent Mater.  2021 Mar;48(1):1-14. 10.14815/kjdm.2021.48.1.1.

Color comparison of glaze-treated multi-coloured lithium disilicate and zirconia

Affiliations
  • 1Department of Dental Biomaterials and Institute of Biodegradable Material, School of Dentistry, Jeonbuk National University, Jeonju-si, Republic of Korea
  • 2Department of Orthodontics, School of Dentistry, Institute of Oral Biosciences, Jeonbuk National University, Jeonju-si, Republic of Korea
  • 3Department of Dental Lab Technology, Gwanju Health University, Gwangju, Republic of Korea

Abstract

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.

Keyword

Zirconia; Lithium disilicate; Optical properties; Glaze
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