Zirconia ceramics, their contrast ratio and grain size depending on sintering parameters
Bogna Stawarczyk1, Angela Emslander, Malgorzata Roos
1Department of Prosthodontics, Ludwig-Maximilian-University.
Abstract:
This study investigated the contrast ratio and grain size depending on sintering parameters of twelve different zirconia materials and compared with glass-ceramic (N=156, n=12 per group). Contrast ratio of all ceramics was measured using a spectrophotometer according to ISO 2471: 2008. Grain sizes of zirconia were determined by SEM. Data was analyzed using one-way ANOVA followed by post-hoc Scheffé-test, Kruskal-Wallis-H-test and Spearman correlation (p<0.05). The area under the sintering curve up 25°C (AUC25) and 1200°C (AUC1200) of zirconia was calculated. Glass-ceramic showed significantly lowest contrast ratio compared to zirconia. Final sintering temperature and AUC1200 influenced contrast ratio. Grain size was affected by final sintering temperature, sintering duration and AUC. Contrast ratio and grain size showed an association.
Related Concept Videos
Fineness of Cement
Direct...
Pozzolans
Fly ash is...
Aggregate Cement Ratio
Porosity in Cement Paste
The balance of water to cement in the mix is...


