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. 2017 Jun 12;10(6):643. doi: 10.3390/ma10060643

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© 2017 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 enamel demineralization tested by transverse microradiography (TMR). (a) Mineral volume content of the enamel bonding with composites by QAM adhesives; (b) mineral loss (n = 6); and (c) lesion depth (n = 6) of enamel bonding with composites by adhesives containing QAMs with different alkyl chain lengths (CL = 3, 6, 9, 12, and 16) or none. Bars with the same letter indicate a value having no significant distance, and those with different letters indicate a significant difference (p < 0.05).