title: [Comparison of shade matching accuracy of tabs of shadeguide and tabs out of shadeguide].
abstract: OBJECTIVE
  To compare the shade matching accuracy between tabs of shade guide and tabs out of shade guide by prosthodontists.
  
  
  METHODS
  Sixty-two graduate students who had 1 to 5 years clinical experience without color blindness were included in this study. Twenty-nine tabs from Vita 3D-Master shadeguide and 7 tabs out of Vita 3D-Master shade guide but from Vita Bleachedguide 3D-Master were taken as the targets of shade matching and observed under the standard light. Subjects' shade matching accuracy on tabs of shadeguide and tabs out of shadeguide was recorded. Frequency of right match was analyzed using Monte Carlo exact probability-test. Wilcoxin test was used to analyze the difference between each group on ranked data of value, chroma and hue.
  
  
  RESULTS
  The shade matching accuracy of tabs of shade guide [45.9% (199/434)] was significantly higher than that of tabs out of shade guide [9.0% (39/434)]. There was significant difference between the two kinds of tabs of ranked data of value [0.2 (0.1 - 0.3), 0.4 (0.4 - 0.5)] and chroma [0.2 (0.1 - 0.4), 0.5 (0.4 - 0.6), P < 0.01, but there was no significant difference in hue data [0.3 (0.1 - 0.4), 0.3 (0.1 - 0.4)].
  
  
  CONCLUSIONS
  The shade matching ability of prosthodontists on tabs out of shade guide is lower than that on tabs of shadeguide. To fulfill clinical need, more training is necessary.
authors: The First Outpatient Dental Clinic, Peking University School and Hospital of Stomatology, Beijing 100034, China.
authors: Ming-Ming
authors: MM
authors: Xu
authors: Tong-Kai
authors: TK
authors: Xu
authors: Feng
authors: F
authors: Liu
authors: Shu-Xin
authors: SX
authors: Ren
authors: Hai-Lan
authors: HL
authors: Feng
mesh_terms: D003815:Dentists / Q000523:psychology*; D004955:Esthetics, Dental; D006801:Humans; D015588:Observer Variation; D010364:Pattern Recognition, Visual; D017797:Prosthesis Coloring / Q000379:methods; D015203:Reproducibility of Results