Effects of beverage colorants and accelerated aging on the color stability of indirect resin composites

Abstract

Background/purpose: Discoloration of resin-based restorations is considered a common obstacle in restorative dentistry. Several studies assessed the color stability of direct resin composites; however, little is known regarding indirect/laboratory composite resins (ICRs). The purpose of this study was to investigate the color stability of two ICRs (Gradia, Gradia, GC Dental Products) and (SR-Adoro, SR Adoro, Ivoclar Vivadent) compared to a feldspathic porcelain (Ceramco II, DENTSPLY Ceramco) following immersion in different beverages or subjected to accelerated aging. Materials and methods: Using a machine-made metal mold, 20 disc samples (10 mm in diameter and 2 mm thick) were fabricated from each proposed material. Discs were randomly divided into four groups. The baseline measurements of CIELAB metric parameters were performed on all specimens with a spectrophotometer. Three groups then underwent an immersion process in different media (coffee, tea, and cola) for 2 weeks. The last group was subjected to UV aging for 300 hours. The color coordinates and their corresponding color changes (DE) were measured. Results: The greatest color changes were seen in the coffee solution (DE Z 13.34 for SR-Adoro and DE Z 16.

Effect of artificial accelerated aging on surface roughness and color stability of different ceramic restorations

“…This pattern of chemical dissociation is claimed to be the way this method of artificial aging affects resinous substances. [4,21] In the other 2 ceramic groups, a slight and insignificant color change took place as a sequela to the artificial accelerated aging. The amount of color change observed in the F and T groups was insignificant, and was below both the clinical acceptability and perceptibility levels set in this study.…”

Effect of artificially accelerated aging on margin fit and color stability of laminate veneers

“…According to the manufacturer, 300 h of weathering equals one year of clinical intraoral service [26] . Weathering is a convenient method to test the performance and endurance of dental materials used in many studies [22,26] . It encompasses alternating exposure of darkness and light as well as intermittent exposure to water spray.…”

“…Artificially accelerated aging is used to simulate the oral environmental conditions to evaluate the ability of restorative materials to remain unchanged [20][21][22] .…”

Evaluation of Staining-Dependent Colour Changes in Resin Composites Using Principal Component Analysis

“…Colour changes in restorative composites upon exposure to simulated oral environments have been the subject of extensive research in recent years. Many materials have been immersed in staining agents, most frequently drinks and mouthwashes, and their colour changes have been quantified and analysed 1 2 3 4 5 6 7 8 9 10 11 12 13 . Because the colours of materials can be expressed with coordinates in colour spaces (usually in the Commission International de l’Eclairage colour system – CIE or Munsell Colour System), variations in the values of colour coordinates can be considered as quantifiers of the colour changes.…”