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. 2019 Mar 14;12(6):863. doi: 10.3390/ma12060863

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© 2019 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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A1: Representative cluster of Group 1; A2: Detail of the slight-chamfer finish line; A3: Slight-chamfer zirconia coping on the proprietary metal abutment; B1: Representative cluster of Group 2; B2: Detail of the deep-chamfer finish line; B3: Deep-chamfer zirconia coping on the proprietary metal abutment; C1: Representative cluster of Group 3; C2: Detail of the knife-edge finish line; C3: Knife-edge zirconia coping on the proprietary metal abutment.