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. 2021 May 31;13(11):1810. doi: 10.3390/polym13111810

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

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Forest plot for gingival thickness in test group (collagen matrix). The weighted mean is presented at CI 95%. Heterogeneity was determined using Higgins (I²). A random-effects model was applied. Statistical significance was set at 0.05.