It is self-limiting in its depth of etch (average depth of 1.9 μm with 15-second etch),1 creating an etch pattern that adhesives can penetrate for increased bond strength. Ultra-Etch etchant's unique self-limiting chemistry on dentin creates an optimal surface to receive resin.2 Though Ultra-Etch etchant is viscous, it can penetrate into the occlusal fissures or vertical surfaces due to physical and chemical properties that promote capillary action.
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