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. 2021 Jan 5;14(1):223. doi: 10.3390/ma14010223

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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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Three-dimensional micro-CT images of PR-DDM. Size of perforation (arrow) at 2 months (a) and 4 months (b). Loss of structural integrity with demineralized dentin (asterisk) due to bio-absorption at 4 months.