Objectives: To evaluate the reliability of a new clinical shade matching instrumentation (ShadeScan, Cynovad) with three different shade guides. Methods: Three shade guides (Vita Lumin Vacuum, Vitapan 3D Master and Chromoscop) were cleaned with Ivory soap and subsequently with distilled water. For each shade guide, the shade tabs were selected at random and placed in the middle of a Shofu Gummy (medium) with tabs of identical shade from different guides placed adjacent to it. The ShadeScan measurements were made of the center tab inside a simulated mouth (matt black box). All the tabs from each shade guide were measured in a random order. Each center tab was measured 10 times. The data from the ShadeScan were downloaded to a computer and analyzed with Cynovad ShadeScan software. The shade of the center tab corresponding to the original shade guide was recorded in a spreadsheet. The percentage correct matches (shade guide to ShadeScan measurement) and confidence interval (CI) were calculated for each shade tab with statistical software. Results: The average percentage correct repeatability of the ShadeScan for the three shade guides and their CI are as follows: Vita Lumin=95% (CI= 26.2% - 100%), Vitapan 3D Master=91.5% (CI=12.2% - 100%), Chromoscop=79.0% (CI=18.7% to 100%). The overall average repeatability for the ShadeScan was 88.5%. Conclusion: The ShadeScan showed a high overall repeatability when shade tabs from three shade guides were measured 10 times. Supported in part by a grant from the Editorial Council of the Journal of Prosthetic Dentistry and equipment loan from Cynovad, Canada.

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