Color Stability of Stained and Glazed Monolithic Zirconia Following Thermocycling
Abstract
INTRODUCTION: Achieving satisfactory esthetics and transparency are a key requirement for zirconia restorations to be comparable to other ceramics. The extrinsic staining and glazing can fulfill the requirement but there is currently lack of information on their longevity. OBJECTIVES: This study investigates the surface color changes (E) of stained and glazed monolithic zirconia restorations during artificial aging. Three extrinsic staining and glazing systems were applied to groups of monolithic zirconia discs and the color stability was measured using a spectrophotometer. METHODS: Ninety monolithic zirconia discs (IPS e. max ZirCAD LT A1) were prepared into three groups of extrinsic staining and glazing: Miyo, ICE Zirkon Stains Prettau, and IPS Ivocolor. The baseline was measured using the Vita Easy Shade Advance 4.0 spectrophotometer. A thermocycling machine was used to simulate the oral environment and E was measured after 5,000, 10,000, 20,000, 30,000, 40,000and 50,000 thermocycles. The change in E was calculated from the baseline. RESULTS: The average change in Delta E after 50,000 thermocycles was 0.688 for Miyo, 1.267 for IPS Ivocolor and 0.726 for ICE Zirkon Stains Prettau. Each sample was scored according to perceptibility (Delta E = 0.8) and acceptability (Delta E = 1.8) thresholds, designated as pass or fail. Seventy-three percent of Ivocolor Zirkon Stains Prettau samples failed on perceptibility threshold (p<0.0023) and thirty percent failed the acceptability threshold (p<0.0001). The proportions for Miyo and ICE Zirkon Stains were consistently the same. Thirty-seven percent failed on perceptibility threshold, but all samples passed the acceptability threshold.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 2023
- Accession Number
- AD1222349
Entities
People
- Chang W. Jung
Organizations
- Uniformed Services University of the Health Sciences