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Precision of in vivo colorimetric assessments of teeth
1University of Manitoba, Winnipeg, Canada.
Purpose:
The repeatability of an intraoral positioning device for a tristimulus photoelectric colorimeter was assessed with the left maxillary central incisors of seven subjects.
Material And Methods:
Intraclass correlation coefficients and repeatability color differences were determined from repeated color measurements made by the same examiner on 3 separate days. Interexaminer repeatability was tested by comparing CIELAB measurements of the same tooth made by two different examiner combinations, both using the positioning device.
Results:
High intraclass correlation coefficients were demonstrated for intraexaminer and interexaminer repeatability. Repeatability color differences were 0.34 delta E units for intraexaminer assessments, whereas interexaminer repeatability color differences were 0.13 and 0.61 delta E units for the two examiner pairs.
Conclusions:
It was concluded that a colorimeter, equipped with a custom positioning jig, had acceptable precision for intraoral measurement of longitudinal changes in tooth color.