IADR Abstract Archives
Color Stability of Amine-free Dental Cement
Objectives: Chemical and dual cured cements contain an amine-based initiator. Amine-based initiators may oxidize leading to color change in the cement. The purpose of this study was to measure the color change of a novel amine-free cement compared to two clinical successful resin cements.
Methods: 1mm thick discs of 2 amine based resin cements (Multilink Automix; Ivoclar, Rely X Ultimate; 3M) and an amine-free resin cement (Panavia V5; Kuraray Noritake Dental) were fabricated (n=10) in a polyvinyl siloxane mold covered by a mylar sheet and glass slide. The cements were allowed to polymerize for 1hr in the dark. Baseline color values (Lab) were then measured with a spectrophotometer against white and black backgrounds. Specimens were then placed in distilled water (370C) for 1 day, 1 week, 2 weeks, 3 weeks, and 4 weeks. After each storage time, the color measurements were taken. Change in color from baseline was reported as ∆E based on the formula: ∆E = (∆2+∆a2+∆b2)0.5.
Results: Two separate repeated measures ANOVAs found factors material and time and their interaction significant (p<.01) for both white and black backgrounds. Tukey post-hoc test determined that color change of materials ranked: Panavia V5 < Multilink Automix < RelyX Ultimate (for white background) and Panavia V5 and Multilink Automix < RelyX Ultimate (for black background). Separate post-hoc tests for each material grouped statistically similar time points with similar superscripts.
Conclusions: The amine-free resin cement showed less color variation with time than two amine-based cements. Project supported by Kuraray Noritake Dental Inc.
Methods: 1mm thick discs of 2 amine based resin cements (Multilink Automix; Ivoclar, Rely X Ultimate; 3M) and an amine-free resin cement (Panavia V5; Kuraray Noritake Dental) were fabricated (n=10) in a polyvinyl siloxane mold covered by a mylar sheet and glass slide. The cements were allowed to polymerize for 1hr in the dark. Baseline color values (Lab) were then measured with a spectrophotometer against white and black backgrounds. Specimens were then placed in distilled water (370C) for 1 day, 1 week, 2 weeks, 3 weeks, and 4 weeks. After each storage time, the color measurements were taken. Change in color from baseline was reported as ∆E based on the formula: ∆E = (∆2+∆a2+∆b2)0.5.
Results: Two separate repeated measures ANOVAs found factors material and time and their interaction significant (p<.01) for both white and black backgrounds. Tukey post-hoc test determined that color change of materials ranked: Panavia V5 < Multilink Automix < RelyX Ultimate (for white background) and Panavia V5 and Multilink Automix < RelyX Ultimate (for black background). Separate post-hoc tests for each material grouped statistically similar time points with similar superscripts.
Conclusions: The amine-free resin cement showed less color variation with time than two amine-based cements. Project supported by Kuraray Noritake Dental Inc.