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 (22.0�?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 (�?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 �?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.