Comparison of color stability of two laminate veneers cemented to tooth surfaces with and without preparation.

Objective: The aim of this study was to determine the effects of preparation vs nonpreparation of tooth surfaces and the types of porcelain laminate veneers (PLVs) on color changes after 300 hours of artificially accelerated aging (AAA).

Materials And Methods: Forty extracted maxillary central incisors were used. The teeth were divided into four groups (n = 10) to evaluate preparation methods and porcelain types: Group A: tooth preparation with IPS e.

Addition of antibacterial agent effect on color stability of composites after immersion of different beverages.

Objective: The aim of this study was to evaluate the effect of the addition of antibacterial agents to composites on color changes after immersion of these composites in different beverages.

Materials And Methods: Composite resins containing antibacterial agents (bioactive glass [BAG] and nano-zinc silicium [NZS]) and a control group (no agent) were produced. The treatment groups were as follows: control, BAG, NZS, and BAG + NZS.