title: Differences between the human eye and the spectrophotometer in the shade matching of tooth colour.
abstract: OBJECTIVE
  The aim of this work was to assess the agreement between instrumental and visual colour matching.
  
  
  METHODS
  Shade selection with the 3DMaster Toothguide (Vita-Zahnfabrik) was performed for 1361 maxillary central incisors and compared with the shade obtained with the EasyShade Compact (Vita-Zahnfabrik) spectrophotometer.
  
  
  RESULTS
  We observed a greater correlation between the objective method and the subjective one in the colour dimension of lightness (Kappa 0.6587), followed by hue (Kappa 0.4337) and finally chroma (Kappa 0.3578).
  
  
  CONCLUSIONS
  The colour dimension in which the greatest agreement is seen between the operator and the spectrophotometer is value or lightness.
  
  
  CONCLUSIONS
  This study reveals differences between the measurement of colour via spectrophotometry and the visual shade selection method. According to our results, there is better agreement in the value or lightness colour dimension, which is the most important one in the choice of tooth colour.
authors.affiliation: Department of Dentistry, School of Medicine, University of Salamanca, Spain. Electronic address: crisgodent@usal.es.
authors.forename: Cristina
authors.initials: C
authors.lastname: Gómez-Polo
authors.affiliation: Department of Orofacial Prosthesis, Faculty of Dentistry, University Complutense of Madrid, Spain. Electronic address: miguelodon@hotmail.com.
authors.forename: Miguel
authors.initials: M
authors.lastname: Gómez-Polo
authors.affiliation: Department of Orofacial Prosthesis, Faculty of Dentistry, University Complutense of Madrid, Spain. Electronic address: acelemin@odon.ucm.es.
authors.forename: Alicia
authors.initials: A
authors.lastname: Celemin-Viñuela
authors.affiliation: Department of Orofacial Prosthesis, Faculty of Dentistry, University Complutense of Madrid, Spain. Electronic address: mtzvdep@odont.ucm.es.
authors.forename: Juan Antonio
authors.initials: JA
authors.lastname: Martínez Vázquez De Parga
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003116:Color; D003118:Color Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology*; D008027:Light; D008297:Male; D008437:Maxilla; D008875:Middle Aged; D017797:Prosthesis Coloring / Q000295:instrumentation* / Q000592:standards; D013053:Spectrophotometry / Q000295:instrumentation* / Q000592:standards; D055815:Young Adult
keywords: Shade guide; Spectrophotometer; Tooth colour; Visual shade match