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. 2020 Jan 6;12:1–8. doi: 10.2147/CCIDE.S219705

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© 2020 Saade et al.

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Failure modes of the studied groups: Cohesive failure (RC) within the resin cement; a part of resin cement adhered to zirconia surface (black arrow). Interfacial failure (IF) between the cement and zirconia; a little or no resin cement adhered on the zirconia surface ( black arrow). Cohesive within the resin composite (CO); the fracture with the composite cylinder (back arrow).