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Representative images for the TS group. (a) B-scan showed low backscattered reflection at the cavity floor, including the target area (dotted box (b)). (b) A confirmatory CLSM image (×50 magnification) for the target area (dotted box (a)) showed no interfacial gap at the dentin-resin interface. E: enamel; D: dentin; RC: resin composite.
