An edge or border. The alveolar margin forms the peripheral edge of bone around the tooth socket. The cavity margin is where the prepared surface of the cavity meets the external surface of the tooth. The enamel margin of a cavity is that part of the margin of a cavity preparation which lies on enamel. The free gingival margin is the edge of the gingival tissue adjacent to the crown of a natural tooth and forms the outer edge of the gingival crevice (sulcus) which in health is normally about 2mm deep. The gingival margin of a cavity is that part of the margin of a tooth preparation closest to the tooth root apex.
Subjects: Dentistry — Bibliography.