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. 2020 Jan 29;56(2):55. doi: 10.3390/medicina56020055

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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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Meta-regressions according to nanoparticle concentration: (A) orthodontic adhesives’ meta-regression according to nanoparticle concentration; (B) resin materials meta-regression according to nanoparticle concentration.