Evaluation of the color reproducibility of all-ceramic restorations fabricated by the digital veneering method.
OBJECTIVE
The objective of this study was to evaluate the clinical acceptability of all-ceramic crowns fabricated by the digital veneering method vis-à-vis the traditional method.


METHODS
Zirconia specimens manufactures by two different manufacturing method, conventional vs digital veneering, with three different thickness (0.3 mm, 0.5 mm, 0.7 mm) were prepared for analysis. Color measurement was performed using a spectrophotometer for the prepared specimens. The differences in shade in relation to the build-up method were calculated by quantifying ΔE(*) (mean color difference), with the use of color difference equations representing the distance from the measured values L(*), a(*), and b(*), to the three-dimensional space of two colors. Two-way analysis of variance (ANOVA) combined with a Tukey multiple-range test was used to analyze the data (α=0.05).


RESULTS
In comparing means and standard deviations of L(*), a(*), and b(*) color values there was no significant difference by the manufacturing method and zirconia core thickness according to a two-way ANOVA. The color differences between two manufacturing methods were in a clinically acceptable range less than or equal to 3.7 in all the specimens.


CONCLUSIONS
Based on the results of this study, a carefully consideration is necessary while selecting upper porcelain materials, even if it is performed on a small scale. However, because the color reproducibility of the digital veneering system was within the clinically acceptable range when comparing with conventional layering system, it was possible to estimate the possibility of successful aesthetic prostheses in the latest technology.
Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School, Korea University, Seoul, Republic of Korea.
Jae-Hong
JH
Kim
Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School, Korea University, Seoul, Republic of Korea.
Ki-Baek
KB
Kim
Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School, Korea University, Seoul, Republic of Korea.
Woong-Chul
WC
Kim
Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School & BK21+ Program in Public Health Sciences, Korea University, Seoul, Republic of Korea.
Hae-Young
HY
Kim
Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School, Korea University, Seoul, Republic of Korea.
Ji-Hwan
JH
Kim
All ceramic restoration; Color reproducibility; Digital veneering; Spectrophotometer