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. 2022 Dec 26;12(1):170. doi: 10.3390/jcm12010170

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Box plots showing the distributions of SpO₂ values of permanent (PERM) and primary (TEMP) teeth with an open apex (a) and with a closed apex (b) around the median value (box) and outliers (dots).