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Color stability and degree of conversion of conventional, amine-free, and self-adhesive resin cements polymerized
Su Young Lee1, Yasushi Shimada2, Jaeyoung Edwin Han3
1Department of Prosthodontics, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea, Banpo-daero 222, Seocho-gu, Seoul 06591, Republic of Korea.
Objectives:
The aims were to compare the color stability and degree of conversion (DC) of resin cements polymerized under different conditions, and also to compare the color stability and DC between conventional, amine-free, and self-adhesive resin cements.
Methods:
The color change of resin cement was measured under different polymerization conditions using one conventional resin cement, three amine-free resin cements, and two self-adhesive resin cements. Resin cement was self-cured (SC), dual-cured under 3-mm-thick zirconia (D3), or dual-cured under 1-mm-thick zirconia (D1). Baseline color of the resin cement was measured first. Artificial aging procedures were performed with either thermo-cycling or ultraviolet (UV) irradiation. After the aging process, specimen color was measured again and the difference was calculated. The color changes of various resin cements were compared under the different effect of polymerization conditions (SC, D3, and D1). The DC of each resin cement was determined by the polymerization method (SC, D3, and D1) using infrared spectroscopy. DC was compared in terms of polymerization method and resin cement product. Statistical analysis was performed using ANOVA and the post-hoc multiple comparisons.
Results:
Color stability was affected by polymerization method as well as type of resin cement. The thermo-cycling aging process made the specimens lighter and less yellowish. UV aging made them darker and more reddish. The DC of resin cements varied depending on the type of resin product and polymerization condition (p < 0.05).
Significance:
The color stability and DC of amine-free cements were neither superior nor inferior to other resin cements.
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