The effect of amine-free initiator system and the polymerization type on color stability of resin cements

Abstract

We investigated the short-term (4 weeks)color stability of light-cure and dual-cure resin cements. Sixty disk-shaped test specimens of adhesive resin cement (10 × 1 mm) were prepared. One feldspathic porcelain test specimen (12 × 14 × 0.8 mm) was prepared from a prefabricated ceramic block. The feldspathic sample was placed on the resin cement disk and all the measurements were performed without cementation. Specific color coordinate differences (ΔL, Δa, and Δb), and the total color differences (ΔE) were calculated after immersion in distilled water for different periods. Data were compared using one-way analysis of variance (

Color stability of emax CAD laminate Veneers cemented with light cure versus dual cure amine free adhesive resin cement (Randomized Controlled Clinical Trial)

“…19 Color change results: The Alpha score of no color change was recorded for all veneers. Invitro study by Çağrı Ural et al 2016 showed that the color change of both light cure and dual cure adhesive resin cement were within clinically accepted level also, third-generation adhesive resin cements with free tertiary amines and benzoyl peroxide underwent smaller color changes than the light-and dual-cure resin materials 3 Marchionatti et al 2017 concluded that The light-and dualpolymerizing modes presented similar color changes for all evaluated periods (2, 6, 12, and 24 months). 20 Also, Ah-Rang Kim, et al 2015 said that the color change of selfcure and dual cure adhesive resin cement caused by the amine group 21 Also, Evren Kilinc et al 2011 concluded that all resin cements did not cause a noticeable color change on the ceramic, which also showed that even a significant color change of the resin cement may be unnoticeable when covered by the ceramic.…”

“…The presence of unreacted double bonds, composition ofmonomers used in the matrix, filler size and content, water absorption, and environmental factors may also cause color instability in resin cements. 2,3 The purpose of the different shades of resin cements is to achieve clinically acceptable estorations with good color matching to the adjacent dentition.…”

The Effect of Color Selection on the Color Stability of the Resin Cement

“…Discoloration by intrinsic factors is accelerated by UV radiation or thermal cycling (20,21). Luting cements at restoration margins are generally exposed to the oral environment and this makes discoloration of resin cements with extrinsic factors such as foods, drinks or smoking possible (15).…”

“…Light exposure increases the conversion and increased conversion causes higher color stability (6,17). Color change of dual cured resin based cements is associated with the oxidization of unreacted amine co-initiator from the redox polymerization system and unreacted benzoyl peroxide (7,20). …”

“…Dual cured resin cements are generally used for luting thin and translucent restorations so color stability is needed (17). Both intrinsic and extrinsic factors leads color change in resin materials (10,15,(18)(19)(20). Intrinsic factors are material related (15).…”