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The limiting or surrounding substance or material of a vessel, cavity, or structure, such as an artery, vein, chest, or bladder. In dentistry, it refers to specific boundaries of a cavity preparation or its location within the tooth, e.g., cavity walls: buccal, lingual, mesial, distal, pulpal, coronal, axial, cervical, facial, incisal, gingival, or enamel.