Abstract
Statement of problem
Pattern materials and their fabrication techniques have been reported to affect the
marginal accuracy and internal fit of pressed lithium disilicate ceramic restorations.
However, information regarding their effect on the color of such restorations is lacking.
Purpose
The purpose of this in vitro study was to evaluate the color of a pressed lithium
disilicate glass-ceramic fabricated from wax or resin patterns by using conventional
and milling techniques.
Material and methods
Fifty-six Ø14×1.5-mm disk pattern specimens were divided into 4 groups based on the
pattern material and fabrication technique: conventional wax pattern group (CW), conventional
resin pattern group (CR), milled wax pattern group (MW), and milled resin pattern
group (MR). Lithium disilicate specimens were fabricated by using the lost wax technique.
The CIELab values were measured with a spectrophotometer (VITA Easyshade Advance).
The ΔE00 values were calculated and compared with perceptibility (ΔE00=0.8) and acceptability (ΔE00=1.8) thresholds to interpret the color differences. The 2-way ANOVA and Tukey post
hoc tests were used to analyze data (α=.05).
Results
Two-way ANOVA revealed that ΔE00 was significantly affected by the pattern material (P<.001), fabrication technique (P=.034), and their interaction (P<.001). The ΔE00 of the CW group (0.76 ±0.04) was clinically imperceptible. No significant difference
in the ΔE00 values was found between the reference and the MW (1.48 ±0.13) and MR (1.51 ±0.15)
groups (P=.926), which were both clinically perceptible and acceptable. The highest ΔE00 was that of the CR group (2.06 ±0.22).
Conclusions
The color of the pressed lithium disilicate ceramic was influenced by the wax and
resin pattern materials fabricated by using conventional or computer-aided design
and computer-aided manufacturing (CAD-CAM) techniques. Only the CW pattern group showed
color differences below the clinically perceptible threshold (ΔE00=0.8). The CR pattern group showed the highest color differences, which were not clinically
acceptable.
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Article info
Publication history
Published online: February 07, 2023
Publication stage
In Press Corrected ProofIdentification
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© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
