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. 2020 Oct 21;13(20):4680. doi: 10.3390/ma13204680

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Evaluation of the trueness of crown for the three types of ceramic blocks in the internal and external parts. (A) Color difference in the internal part of the AM crown, showing the superimposing of 3D data. (B) Color difference in the internal part of the IPS crown, showing the superimposing of 3D data. (C) Color difference in the internal part of the CEL crown, showing the superimposing of 3D data. (D) Color difference in the external part of the AM crown, showing the superimposing of 3D data. (E) Color difference in the external part of the IPS crown, showing the superimposing of 3D data. (F) Color difference in the external part of the CEL crown, showing the superimposing of 3D data.