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. 2021 Feb 12;13(4):543. doi: 10.3390/polym13040543

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© 2021 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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The representative debonded surface morphologies of each group of materials. The FE-SEM image (the magnification was 500× and the scale bar was 50 μm) of (a) the Co-Cr alloy (AP group, pretreatment with both sandblast and primer), (b) zirconia-based ceramic (PR group, primer pretreatment by priming with primer), and (c) (Poly)aryl–ether–ketone materials (PAEKs) (AP group). Residual denture acrylic debris was found in the Co-Cr alloy and zirconia-based ceramic, as shown in the magnified pictures, while the debonded surfaces of the PAEKs shown no residuals.