title: In vivo color stability of resin-veneered telescopic dentures: a double blind pilot study.
abstract: BACKGROUND
  Discoloration is a major disadvantage of resin veneers on telescopic dentures. In vitro color measurements with large and flat samples of resin veneer composites have been published, but no in vivo data are available.
  
  
  OBJECTIVE
  This study describes the discoloration of resin veneers in vivo by use of spectrophotometry and the L*a*b* system of the Commission Internationale de L'Eclairage (CIE).
  
  
  METHODS
  In a clinical evaluation of this technique, two composite veneer materials were compared in 18 patients.
  
  
  RESULTS
  Both brands discolored significantly after 1 year. While L* and a* were not changed significantly, b* and the total color difference delta E increased by approximately 2 units each year. No statistically significant differences were found between the materials.
authors.affiliation: Department of Prosthodontics, University of Tubingen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Setz
authors.forename: E
authors.initials: E
authors.lastname: Engel
mesh_terms: D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D003801:Dental Veneers; D003779:Denture Design; D003828:Denture, Overlay; D004311:Double-Blind Method; D005069:Evaluation Studies as Topic; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008689:Methacrylates / Q000737:chemistry; D010865:Pilot Projects; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013053:Spectrophotometry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; D012821:Silanes; D003776:Dental Porcelain; C057365:Dentacolor