Influence of Thickness of Core and Veneer Ceramics on Transparency of CAD/CAM Glass Ceramics

doi:10.13701/j.cnki.kqyxyj.2020.03.020

Abstract

Abstract: Objective: To explore the contrast ratio (CR) of different thickness of core and veneer of CAD/CAM glass ceramics and the color difference (ΔE) with A2 color test piece. Methods: The IPS e.max and IPS Empress CAD ceramic blocks were processed into square core porcelain with thickness of 0.8, 1.0, and 1.2 mm, respectively. The core porcelain was sintered with 0.7, 0.5, and 0.3 mm veneer porcelain, and finally glazed. A total of 30 porcelain specimens with 12×12 mm and 1.5 mm in the thickness were made (n=5). CM-3600A spectrophotometer was used to measure the color parameters of the specimens, which was used to calculate the CR of the specimens and the ΔE with A2 color test piece. Results: The CR value of IPS e.max CAD group was significantly higher than that of IPS Empress CAD group. The ΔE value of IPS e.max CAD group was less than that of IPS Empress CAD group. Conclusion: IPS e.max CAD and IPS Empress CAD can better simulate the target color with different thickness of core and veneer. The transparency of IPS Empress CAD is higher than that of IPS e.max CAD.

Key words: glass ceramic, optical properties, thickness, contrast ratio

ZHAO Jun, FAN Hong. Influence of Thickness of Core and Veneer Ceramics on Transparency of CAD/CAM Glass Ceramics[J]. Journal of Oral Science Research, 2020, 36(3): 273-275.

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