title: Clinical effect of different shade guide systems on the tooth shades of ceramic-veneered restorations.
abstract: OBJECTIVE
  The objective of this study was to investigate whether a systematically arranged shade guide system (Vita 3D-Master) allows clinicians to achieve a better shade match of a restoration, as compared to a conventional shade guide with a design based on empirical values (Vita Classical).
  
  
  METHODS
  Fifty-nine restorations in 42 patients being treated by student clinicians were assessed. Using 1 of the 2 shade systems assigned randomly, each student independently determined the tooth shade. With the aid of a visual rating scale, the accuracy of the shade match of the finished restoration was assessed.
  
  
  RESULTS
  All restorations whose shades had been determined with the 3D-Master could be placed without any further shade corrections. In contrast, almost 17% of restorations determined with the conventional system required subsequent shade modifications. The match of the shades selected with the 3D-Master was judged significantly better by the clinicians.
  
  
  CONCLUSIONS
  Within the limitations of the study, clinicians with less clinical experience who use a system that guides them through the shade-taking procedure in a relatively systematic manner will be more successful in selecting the correct tooth shade and in avoiding shade corrections. Clinical assessment of the restoration shades showed significant differences between the shade guide with a systematic design and that based on empirical values.
authors.affiliation: Department of Prosthodontics, University of Heidelberg, Germany. alexander.hassel@med.uni-heidelberg.de
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Hassel
authors.forename: Ulrich
authors.initials: U
authors.lastname: Koke
authors.forename: Marc
authors.initials: M
authors.lastname: Schmitter
authors.forename: Joachim
authors.initials: J
authors.lastname: Beck
authors.forename: Peter
authors.initials: P
authors.lastname: Rammelsberg
mesh_terms: D003116:Color / Q000592:standards*; D003776:Dental Porcelain; D003793:Dental Restoration, Permanent; D003801:Dental Veneers; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D018709:Statistics, Nonparametric
chemical_list: D003776:Dental Porcelain