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. 2020 Jun 9;109(1):139–148. doi: 10.1007/s10266-020-00531-x

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© The Author(s) 2020, corrected publication 2021

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Fig. 2 — SEM images (×200 magnification). a–d enamel-composite interfacial zone; e–h dentin-composite interfacial zone; at enamel, adhesive defects were observed in the groups with X. At dentin all groups with OFL, with the exception of XB, showed distinct resin tags with deep penetration; white arrows: adhesive defects, C composite, E enamel, D dentin