Color Stability of Compomer after Immersion in Various Media

Abstract

Purpose: The purpose of this study was to evaluate the effect of various media on the color stability of compomer and to compare these results to those of other materials that could be used in similar clinical circumstances. Materials and Methods:In this test, six materials (shade A2) were used: four compomers (Dyract, Compoglass F, Xeno, F2000), one composite resin (Clearfil AP-X), and one resin-modified glass ionomer cement (Fuji I1 LC). There were four test solutions: one alcoholic (whiskey), two low pH soft drinks (Coca Cola, orange juice), and deionized water as a control. A plastic ring mold (9-mm diameter x 1-mm height) was used to prepare 120 disk specimens. For 60 days, the test specimens were immersed in the various media daily for 3 hours then transferred to the deionized water. Color was measured by CIE L* a* b* relative to CIE source against a white background, using a colorimeter. Color change (AE*) was calculated as AE*= Color changes (AE*) were recorded after 1,7,30, and 60 days. Results:The results indicated that compomer and resin-modified glass ionomer were susceptible to discoloration in various solutions over an extended period of time. Composite resin showed minimal perceptible color change. Specimens immersed in whiskey showed a significantly high perceptible color change ( p < .0001). Water caused no perceptible color changes. CLINICAL SIGNIFICANCECompomer and resin-modified glass ionomer materials are susceptible to discoloration by various media.

Morphological analysis of flowable resins after long-term storage or surface polishing with a mini-brush

“…These results clearly demonstrated that a distinctive relation existed between the filler content of flowable resins and their surface roughness. This relation has been clarified in previous research 6,7,13) . In the present study, flowable resins with lower filler contents were shown to exhibit a higher degree of surface roughness (Table 2).…”

Color stability of composites subjected to accelerated aging after curing using either a halogen or a light emitting diode source

“…The differences of color were given by ΔE*, which was obtained using the following equation (11): √ΔE*= (ΔL*) 2 + (Δa*) 2 + (ΔB*) 2 .…”

“…If the color of the composite changes with time, its main advantage, esthetics, is lost. For this reason, studies have been performed with the goal of assessing the maximum color stability of composites through time (1,2).…”

Tooth whitening recovers the color of pre-stained composites

“…Color change in Dentistry has been expressed quantitatively, based on the CIE L*a*b* system. This system provides a summarizing measure (ΔE*) that represents the overall color change, and may be classified into three distinct intervals, considering the ability of the human eye to recognize differences in colors: a ΔE*<1 is considered imperceptible by the eye, while 1 <ΔE*< 3.3 is considered visible only to a skilled person and ΔE* > 3.3 is easily detected by anyone, characterizing the color change of a restoration as clinically unacceptable 7,8 . Other studies have confirmed the color changing effect of several extrinsic pigments from dietary sources, including grape juice, red wine and coffee 4,[8][9][10] .…”