Oral Health and Dental Management

Color and translucency of microwave-sintered pre-colored dental monolithic zirconia ceramics

30^th Annual Conference on Dental Practice and Oral Health

September 18-19, 2017 Hong Kong

Sung-Hun Kim and Hee-Kyung Kim

Seoul National University, South Korea
Ajou University, South Korea

Posters & Accepted Abstracts: Oral Health Dent Manag

Abstract:

Purpose: The purpose of this study was to compare the optical properties of pre-colored dental monolithic zirconia ceramics of various thicknesses sintered in a microwave and a conventional furnace. Materials & Methods: A2-shade of pre-colored monolithic zirconia ceramic specimens (22.0Ã?22.0 mm) in 3 thickness groups of 0.5, 1.0 and 1.5 mm were divided into 2 subgroups according to the sintering methods (n=9): Microwave and conventional sintering. Spectrophotometer was used to obtain CIELab color coordinates and translucency parameters and CIEDE2000 color differences (Î?E00) were measured. The relative amount of monoclinic phase (Xm) was estimated with X-ray diffraction. Statistical analyses were conducted with two-way ANOVA (α=0.05). Results: There were small interaction effects on CIE L*, a* and TP between sintering method and thickness (P<0.001): L* (partial eta squared ηp 2=0.115), a* (ηp 2=0.136) and TP (ηp 2=0.206), although higher b* values were noted for microwave sintering regardless of thickness. Color differences between two sintering methods ranged from 0.52 to 0.96 Î?E00 units. The Xm values ranged from 7.03% to 9.89% for conventional sintering and from 7.31% to 9.17% for microwave sintering. Conclusions: Microwave-sintered pre-colored dental monolithic zirconia ceramics can exhibit similar color perception and translucency to those by conventional sintering with reduced processing time.

Biography :

Sung-Hun Kim has received DDS and his Dental training in Korea and PhD in England. He is a Professor of Department of Prosthodontics at Seoul National University Dental School. He has published more than 100 papers in reputed journals and has been serving as an Editor-In-Chief of Journal of Advanced Prosthodontics.