IADR Abstract Archives
Discoloration Resistance Property of Light-Cured Characterization Materials
Objectives: Light-cured characterization materials like OPTIGLAZE color (GC) are used to staining or glazing on wide range of resin materials such as CAD/CAM hybrid resin blocks, composite resins and denture teeth. However, there is a risk of discoloration due to a large amount of resin components in such products, resulting in the aesthetics get poor. In this study, it was evaluated the discoloration resistance property of light-cured characterization materials in several environments.
Methods: OPTIGLAZE color Clear (GC, OC), MAZIC Glaze Clear (VERICOM, MG) and VITA AKZENT LC GLAZE (VITA, VA) were examined. They were applied and light-cured with Labolight Duo (GC) on 1mm thickness of CERASMART270 A2 LT which was sandblasted with 50µm alumina and treated with G-Multi PRIMER (GC) in advance, in accordance with manufacturer’s instructions. The specimens of each group were immersed in distilled water, coffee or red wine at 37 degree C for 1 week, respectively. The color of each specimen, before and after the immersion, were measured with spectrophotometer (SD 7000, NIPPON DENSHOKU), and ΔE*ab was calculated (n=3). All results were analyzed by Tukey-Kramer test (p<0.05).
Results: The color change in distilled water immersion was apparently smaller than in coffee and red wine. Both in coffee and red wine immersion group, OC showed significantly lower ΔE*ab (3.48 and 9.66, respectively) than that of MG (6.12, 11.39) and VA (7.58, 16.75). Furthermore, those difference could be clearly seen visually. These results were considered to be largely influenced by the difference in the structure and amount of the monomers used.
Conclusions: It was seen that the light-cured characterization materials tend to be discolored under strong color components like coffee and/or red wine. However, OC was apparently less discolored compared to the others and could be expected to be kept the aesthetics for long lasting clinical cases.
Methods: OPTIGLAZE color Clear (GC, OC), MAZIC Glaze Clear (VERICOM, MG) and VITA AKZENT LC GLAZE (VITA, VA) were examined. They were applied and light-cured with Labolight Duo (GC) on 1mm thickness of CERASMART270 A2 LT which was sandblasted with 50µm alumina and treated with G-Multi PRIMER (GC) in advance, in accordance with manufacturer’s instructions. The specimens of each group were immersed in distilled water, coffee or red wine at 37 degree C for 1 week, respectively. The color of each specimen, before and after the immersion, were measured with spectrophotometer (SD 7000, NIPPON DENSHOKU), and ΔE*ab was calculated (n=3). All results were analyzed by Tukey-Kramer test (p<0.05).
Results: The color change in distilled water immersion was apparently smaller than in coffee and red wine. Both in coffee and red wine immersion group, OC showed significantly lower ΔE*ab (3.48 and 9.66, respectively) than that of MG (6.12, 11.39) and VA (7.58, 16.75). Furthermore, those difference could be clearly seen visually. These results were considered to be largely influenced by the difference in the structure and amount of the monomers used.
Conclusions: It was seen that the light-cured characterization materials tend to be discolored under strong color components like coffee and/or red wine. However, OC was apparently less discolored compared to the others and could be expected to be kept the aesthetics for long lasting clinical cases.
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