ArticleJournal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]2026
Optical Properties of Multi-Yttria-Layered Zirconia: Influence of "High-Speed" Sintering Protocol.
Article in Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.], 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo evaluate the impact of high-speed compared to conventional sintering protocols on the color difference (ΔE MATERIALS AND
methodsUsing a 5-axis milling machine (PrograMill PM7), 60 specimens (14 mm diameter × 1 ± 0.1 mm thickness) were made from the incisal, transition, and core zones of multi-yttria-layered 3Y/5Y-PSZ (IPS e.max ZirCAD Prime, Ivoclar Vivadent). Specimens were randomly allocated to conventional sintering (9 h) or speed sintering (15 min) in a programmable furnace (Programat CS6). Using a spectrophotometer (Ci7600, X-Rite), spectral reflectance over black and white backgrounds was measured. The CIEDE2000 formula was used to calculate the color difference (ΔE
resultsHigh-speed sintering resulted in color changes that were greater than the AT (ΔE
conclusionsSpeed sintering significantly reduces the optical properties of multi-yttria-layered zirconia, especially in the esthetically crucial incisal zone, resulting in clinically unacceptable color shifts and decreased translucency relative to conventional sintering methods. CLINICAL SIGNIFICANCE: While speed sintering significantly reduces time in the digital workflow, it may negatively impact the final aesthetic outcome of multi-yttria-layered zirconia restorations by compromising optical properties and reducing translucency in the incisal and transition zones. When maximum aesthetic integration is needed for anterior restorations, clinicians and lab technicians should prioritize conventional sintering.
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