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Etymology: L, contra, against; OFr, baif, open mouth
1 also called reverse bevel. the angle between a dental cutting blade and the base of the periodontal pocket when the blade is held so that it separates the sulcular epithelium from the external epithelium of the gingiva.
2 an external bevel of a tooth preparation extending onto a buccal or lingual cusp from an intracoronal restoration.