title: Effect of zircon-based tricolor pigments on the color, microstructure, flexural strength and translucency of a novel dental lithium disilicate glass-ceramic.
abstract: The purpose of this study was to investigate the effect of zircon-based tricolor pigments (praseodymium zircon yellow, ferrum zircon red, and vanadium zircon blue) on the color, thermal property, crystalline phase composition, microstructure, flexural strength, and translucency of a novel dental lithium disilicate glass-ceramic. The pigments were added to the glass frit, milled, pressed, and sintered. Ninety monochrome samples were prepared and the colors were analyzed. The effect of the pigments on thermal property, crystalline phase composition, and microstructure were determined by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively. Addition of the pigments resulted in the acquisition of subtractive primary colors as well as tooth-like colors, and did not demonstrate significant effects on the thermal property, crystalline phase composition, microstructure, and flexural strength of the experimental glass-ceramic. Although significant differences (p < 0.01) were observed between the translucencies of the uncolored and 1.0 wt % zircon-based pigment colored ceramics, the translucencies of the latter were sufficient to fabricate dental restorations. These results indicate that the zircon-based tricolor pigments can be used with dental lithium disilicate glass-ceramic to produce abundant and predictable tooth-like colors without significant adverse effects, if mixed in the right proportions.
authors.affiliation: Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, 710032, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Yuan
authors.forename: Fu
authors.initials: F
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Gao
authors.forename: Xiang
authors.initials: X
authors.lastname: Sun
authors.forename: Zai-Xi
authors.initials: ZX
authors.lastname: Deng
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Jin
authors.forename: Ji-Hua
authors.initials: JH
authors.lastname: Chen
mesh_terms: D002516:Ceramics; D004396:Coloring Agents / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D017797:Prosthesis Coloring; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength; D015040:Zirconium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D003764:Dental Materials; D017640:Silicates; C493120:lithia disilicate; D003776:Dental Porcelain; C003784:zircon; C023506:Glass ceramics; D015040:Zirconium
keywords: coloration; dental; glass-ceramic; lithium disilicate; zircon-based pigment