Comparing of Color Stability of Adhesive Resin Cements

Objectives: To evaluate and compare the Color Stability of two Adhesive Resin Cements: Zirconite BJM (ZC) versus MaxCem Elite cement, Kerr (MCE) regarding to the requirements of ISO 7491 “Determination of color stability", ISO 4049 and ISO/TR 28642. In this study, color stability of three shades of each one of two cements were evaluated.
Methods: Four specimens of each cement were chemically polymerized and proceeded as following (according to ISO) (table 1)
Color change was analyzed by XRite i5 Color spectrophotometer. The value represents the distance in color space that a sample falls from the standard (DEcmc). DEcmc ≤ 3.00 - excellent match; 3.00 < DEcmc < 5.00 - acceptable value; DEcmc > 5 - unacceptable value.
Results: Group 2 compared with the same material analyzed immediately after polymerization (table 2).
Group 3 and 4: Color changes of the exposed (Group 3) and unexposed (Group 4) specimens were compared to the color value of the reference (Group 1) (table 3).
Conclusions: Chemically polymerized Zirconite Cement (BJM), shades: Clear, Yellow and White showed good color and shade stability after 24 hours exposure to the irradiation in wet conditions while tested in accordance with ISO standard, better than chemically polymerized MaxCem Elite cement.