title: Accuracy and precision of a system for assessing severity of tooth wear.
abstract: OBJECTIVE
  The purpose of this study was to introduce a computer-assisted quantitative tooth wear-analyzing system and test its accuracy and precision.
  
  
  METHODS
  An image of a horizontally projected dental arch was captured, and the facet area of each tooth was calculated using a digital image analyzer. For normalization, the facet area of the individual tooth was divided by the total area of the corresponding tooth; this result was the tooth wear score. The accuracy and precision of this method were determined through the intraclass correlation coefficient using 10 dental casts. Tooth wear on the dental casts of 50 subjects was actually measured.
  
  
  RESULTS
  The accuracy of the tooth wear score determined by a newly trained examiner was greater than 0.85 of the intraclass correlation coefficient; this was tested against the score determined by consensus of three experienced examiners. The reproducibility within a 1-week interval was also greater than 0.85. With regard to the tooth wear score from 50 sets of dental casts, the distribution of tooth wear was generally consistent with data reported in the literature.
  
  
  CONCLUSIONS
  The results suggest that the newly trained examiner can exhibit adequate accuracy and precision after appropriate training in identifying tooth wear facets. Recorded data from 50 subjects added face validity to this new system.
authors.affiliation: TMJ Clinic, Tokyo Medical and Dental University, Japan. th.tmj@tmd.ac.jp
authors.forename: Tadasu
authors.initials: T
authors.lastname: Haketa
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Baba
authors.forename: Satoshi
authors.initials: S
authors.lastname: Akishige
authors.forename: Kenji
authors.initials: K
authors.lastname: Fueki
authors.forename: Koji
authors.initials: K
authors.lastname: Kino
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohyama
mesh_terms: D000328:Adult; D003936:Diagnosis, Computer-Assisted; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D003765:Models, Dental; D015588:Observer Variation; D009811:Odontometry / Q000379:methods; D015203:Reproducibility of Results; D019217:Tooth Attrition / Q000175:diagnosis*