Comparison of the Easyshade Compact and Advance in vitro and in vivo
Andreas Zenthöfer1, Tomas Cabrera, Nicoleta Corcodel
1Department of Prosthodontics, Dental School, University of Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany, andreas.zenthoefer@med.uni-heidelberg.de.
Objective:
The objective of this study was to evaluate the repeatability, inter-examiner and inter-device reliability, and accuracy of the new VITA Easyshade Advance (ES-A) spectrophotometer in comparison with the Easyshade Compact (ES-C).
Methods:
For the in vitro study, six porcelain disks of random shade mixtures were fabricated from VITA ceramic powders. To analyze the repeatability of the ES-C and ES-A, readings were obtained by one examiner for one porcelain disk and one shade tab (VITA 3D-Master). Measurements were repeated by two examiners to evaluate inter-examiner reliability. To assess accuracy, porcelain disks and shade tabs were measured with the ES-C and ES-A and by means of a spectroradiometer (SR). ∆E values between the shade tabs and disks were calculated. Differences between devices were evaluated by use of univariate analysis. Reliability and accuracy of both devices were also tested in a clinical setting. The intra-class correlation coefficient (ICC) was calculated for all assessments of reliability.
Results:
Good agreement was observed for replicate measurements (ICC > 0.9), for inter-examiner reliability of the ES-A and ES-C (ICC > 0.9), and for inter-device agreement (ICC > 0.9). Univariate analysis revealed that ∆E values for the spectrophotometers were consistent (p = 0.783); spectroradiometrically measured ∆E was comparable, but the mean value was smaller than that for the spectrophotometers (p = 0.004). Clinical inter-device agreement was acceptable to high (ICC > 0.777). The accuracy of the ES-A was higher than that of the ES-C (p = 0.001).
Conclusion:
Within the limitations of the experiment, the spectrophotometers tested enabled reliable and accurate measurement. In the clinical setting, however, the ES-A seems more accurate.
Clinical Relevance:
ES-C and ES-A can be valuable tools for the determination of tooth colors. Because of their good reliability, they should especially be used for the assessment of tooth color changes over time.
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