title: Effects of shade tab arrangement on the repeatability and accuracy of shade selection.
abstract: BACKGROUND
  Appropriate and repeatable shade matching using visual shade selection remains a challenge for the restorative dentist.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the effect of different arrangements of a shade guide on the repeatability and accuracy of visual shade selection by restorative dentists.
  
  
  METHODS
  Three Vitapan Classical shade guides were used for shade selection. Seven shade tabs from one shade guide were used as target shades for the testing (A1, A4, B2, B3, C2, C4, and D3); the other 2 guides were used for shade selection by the subjects. One shade guide was arranged according to hue and chroma and the second was arranged according to value. Thirteen male and 22 female restorative dentists were asked to match the target shades using shade guide tabs arranged in the 2 different orders. The sessions were performed twice with each guide in a viewing booth. Collected data were analyzed with Fisher's exact test to compare the accuracy and repeatability of the shade selection (α=.05).
  
  
  RESULTS
  There were no significant differences observed in the accuracy or repeatability of the shade selection results obtained with the 2 different arrangements. When the hue/chroma-ordered shade guide was used, 58% of the shade selections were accurate. This ratio was 57.6% when the value-ordered shade guide was used. The observers repeated 55.5% of the selections accurately with the hue/chroma-ordered shade guide and 54.3% with the value-ordered shade guide.
  
  
  CONCLUSIONS
  The accuracy and repeatability of shade selections by restorative dentists were similar when different arrangements (hue/chroma-ordered and value-ordered) of the Vitapan Classical shade guide were used.
authors.affiliation: Division of Restorative and Prosthetic Dentistry, The Ohio State University, College of Dentistry, Columbus, USA.
authors.forename: Burak
authors.initials: B
authors.lastname: Yılmaz
authors.forename: Bulem
authors.initials: B
authors.lastname: Yuzugullu
authors.forename: Duygu
authors.initials: D
authors.lastname: Cınar
authors.forename: Semih
authors.initials: S
authors.lastname: Berksun
mesh_terms: D000328:Adult; D016009:Chi-Square Distribution; D003116:Color / Q000592:standards*; D003793:Dental Restoration, Permanent; D003815:Dentists; D005260:Female; D006801:Humans; D008297:Male; D015588:Observer Variation; D017797:Prosthesis Coloring / Q000592:standards*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires