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Clinical photos illustrate the two most common pathways for the failure of resin-based materials, secondary caries (A) and restoration fracture (B). (A) The arrow in the photo shows the lesion’s location at the tooth-restoration interface presented by yellow to brown discoloration. (B) The arrow in the photo shows the fracture location at the proximal wall of the tooth structure, most probably due to the high mechanical load induced by the masticatory force.
