title: Color stability of compomer after immersion in various media.
abstract: OBJECTIVE
  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.
  
  
  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 II 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 (delta E*) was calculated as delta E* = [(delta L*)2 + (delta a*)2 + (delta b*)2]1/2. Color changes (delta E*) 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.
authors.affiliation: Department of Operative Dentistry and Endodontics, Niigata University, Faculty of Dentistry, Niigata City, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Abu-Bakr
authors.forename: L
authors.initials: L
authors.lastname: Han
authors.forename: A
authors.initials: A
authors.lastname: Okamoto
authors.forename: M
authors.initials: M
authors.lastname: Iwaku
mesh_terms: D000704:Analysis of Variance; D002253:Carbonated Beverages; D003116:Color; D003124:Colorimetry; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D004356:Drug Storage; D000431:Ethanol / Q000737:chemistry; D005638:Fruit; D005899:Glass Ionomer Cements / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D017640:Silicates / Q000737:chemistry
chemical_list: C112828:Clearfil AP-X; C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; C088486:Dyract; C118368:F2000 cement; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; D019279:Resin Cements; D012117:Resins, Synthetic; D017640:Silicates; C417842:Xeno compomer; D000431:Ethanol