Value Discrepancy of Zirconia Post-Sintering Compared to Manufacturer’s Shade Tab
Document Type
Poster
Abstract
Background: Zirconia is an excellent material for crowns, but clinical observations have shown that post-sintered zirconia often appears lighter than indicated on the manufacturer’s shade tab. This discrepancy is particularly noteworthy when working in the esthetic zone. This in vitro study aims to assess the difference in value between post-sintered zirconia and the corresponding value reported by the manufacturer.
Methods: Three types of zirconia (Yttria Multi-Layered [YML], Super-Translucent Multi-Layered [STML], and Ultra-Translucent Multi-Layered [UTML]) were milled in shades A1, A2, and A3, polished, sintered, and re-polished according to manufacturer instructions. Crown values were measured with a spectrophotometer and compared to the manufacturer's Vita Classic shade tab. These values were converted to 3D Master shades for analysis of value alone.
Results: A Chi-Squared test (X²(5, N = 108) = 62.61, P < 0.001) indicated the percentage of agreement between the post-sintered crown values to the manufacturer's reported value for the zirconia blocks. Shades A3 showed the most agreement (72.2%), while A1 showed some agreement (33.3%) and A2 showed the least agreement (5.6%). In other words, the value of shade A3 showed no significant difference from the standard tabs, while A1 and A2 exhibited significant discrepancies.
Conclusion: Findings show a discrepancy in post-sintered zirconia values compared to values reported by the manufacturer in shades A1 and A2 but not A3. This finding is important for clinicians, as it can aid in making a more informed decision during shade selection, ultimately impacting patient satisfaction. Additionally, this highlights the need for the manufacturer to develop a shade guide tailored specifically to the zirconia materials, ensuring more accurate shade matching.
Publication Date
2-2025
Recommended Citation
Mahmoodi, Diana and El-Gendy, Tamer, "Value Discrepancy of Zirconia Post-Sintering Compared to Manufacturer’s Shade Tab" (2025). ASDOH Student Publications. 9.
https://scholarworks.atsu.edu/asdoh-student/9
Comments
Poster presented at ASDOH Research Week - March 2025.
This is a Cubify based presentation hosted at https://my.ltb.io/#/showcase/atsu-asdoh. It includes a video presentation, references, a PowerPoint presentation, and summary poster.