title: Colour stability of porcelain repair materials with accelerated ageing.
abstract: The purpose of this study was to measure and compare the colour stability of three porcelain repair materials (Charizma, Clearfil and Silux Plus) with an all-ceramic material following accelerated ageing. Three composites and one ceramic control were subjected to accelerated ageing for a period of 300 h. Initial specimen colour parameters were determined in the Commission International de I'Eclairage Lab (CIELAB) colour order system with a colorimeter. Colour changes were calculated before (DeltaE) and after 300 h of accelerated ageing (DeltaE*). Colour difference data were subjected to one-way analysis of variance (anova) followed by Duncan's test to examine the interaction between material and time interval of ageing. There were no significant difference between DeltaL values of Porcelain-Charizma and Porcelain-Silux Plus. All mean DeltaL* values were negative after 300 h ageing. Porcelain-Silux Plus demonstrated the highest DeltaL* of the investigated groups. There were significant differences between baseline 300-h aged specimens with respect to Deltaa*, Deltaa for either of the investigated materials. For Silux Plus, Deltaa and Deltaa* values were significantly higher than the others. Significant differences were observed between baseline and 300-h values for Deltab and Deltab*. Deltab and Deltab* values were significantly higher for Silux Plus. There were significant differences between baseline and 300-h values of colour difference, DeltaE, DeltaE*. Highest DeltaE* value was obtained using the microfilled composite, Silux Plus. Lowest value of DeltaE was recorded with the hybrid composite, Charizma.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Hacettepe, Ankara, Türkiye. saygilig@hotmail.com
authors.forename: G
authors.initials: G
authors.lastname: Saygili
authors.forename: S
authors.initials: S
authors.lastname: Sahmali
authors.forename: F
authors.initials: F
authors.lastname: Demirel
mesh_terms: D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D004355:Drug Stability; D006801:Humans; D008422:Materials Testing / Q000379:methods; D017797:Prosthesis Coloring; D019279:Resin Cements / Q000737:chemistry
chemical_list: C084111:Charisma composite resin; C029849:Clearfil Bonding Agent; D003188:Composite Resins; D019279:Resin Cements; D003776:Dental Porcelain; C074741:Silux Plus