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. 2023 Jan-Mar;23(1):38-44.
doi: 10.4103/jips.jips_119_22.

In vitro comparison of the color degradation of two computer-aided design/computer-aided manufacturing provisional materials: A 12-month simulation

Suzanna Maria Sayegh  1 , Maha Daou  2 , Georges Najjar  1 , Elie Zebouni  1
Affiliations

In vitro comparison of the color degradation of two computer-aided design/computer-aided manufacturing provisional materials: A 12-month simulation

Suzanna Maria Sayegh et al. J Indian Prosthodont Soc. 2023 Jan-Mar.

Abstract

Aim: This study evaluated the color aging of two computer aided design/computer aided manufacturing (CAD/CAM) provisional materials of different compositions (polymethyl methacrylate and composite resin) after exposure to thermal aging and immersion in coffee for 3, 6, and 12 intraoral months.

Setting and design: The current in vitro study was conducted from September to December 2021 at the Craniofacial laboratory at the Saint Joseph University in Beirut, Lebanon.

Materials and methods: The shades of 2.0 mm thick, 10.0 mm in diameter disk shaped specimens of VITA CAD Temp® and Ceramill® TEMP were measured using the VITA Linearguide 3D MASTER® and a conversion table to extract the CIE LFNx01aFNx01bFNx01 values on a white background (n = 30).

Statistical analysis used: The color differences ΔE at 3, 6, and 12 months were calculated and analyzed by repeated measures ANOVA followed by Bonferroni multiple comparisons, univariate analyses, and one sample t tests.

Results: The mean ΔET1/T0, ΔET2/T0, and ΔET3/T0 values were significantly higher than the cutoff values for acceptability and perceptibility for the VITA CAD Temp® and the Ceramill® TEMP groups. In addition, the increase in ΔE overtime was significantly greater in the Ceramill® TEMP group compared to the VITA CAD Temp® group.

Conclusions: The Ceramill® TEMP changed color more and faster than the VITA CAD Temp®. In addition, whether at 3, 6, or 12 months, the color variations of both materials are not only perceptible but also unacceptable compared to the initial shade.

Keywords: Color; composite resin; computer-aided manufacturing/computer-aided manufacturing; in vitro; materials; polymethyl methacrylate; stability; temporary.

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Conflict of interest statement

None

Figures

Figure 1
Figure 1
One centimeter diameter and 2 mm thick disc-shaped specimens
Figure 2
Figure 2
Specimens' design and milling
Figure 3
Figure 3
Thermocycling step
Figure 4
Figure 4
Specimens and shade guides on the white background used for color measurement
Figure 5
Figure 5
Chronology of the applied protocol
See this image and copyright information in PMC

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