The CR321 Chroma Meter(Minolta, Ramsey, NJ) has been frequently employed in in vivo bleaching evaluations of quantitative color change and is most often used with a custom positioning jig to insure repeatability. Although this procedure has been shown to yield good results, it is expensive, time consuming and somewhat awkward for the patient. Objective:This study compared agreement of measurements made with and without a custom intraoral positioning device in an in-office bleaching study of 16 subjects utilizing the 6 maxillary anterior teeth. Methods:Ninety-six teeth were measured at 6 times over a 6 week period following in-office bleaching. Measurements were made in the L*a*b* D65 system using a Minolta CR321 colorimeter. Measurements were made with and without the use of the custom positioning device in triplicate at each time. Results:Intra-method ICCs ranged between .92 and .99 for each method indicating excellent repeatability. Inter-method ICCs ranged between .81 and .92 indicating good-excellent agreement between methods. Delta E values between baseline and each following measurement were calculated and compared and average differences between methods were less than 1.0. Conclusions:It was concluded that a custom positioning device provided no benefit in this bleaching study compared to measurements made without the device.

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