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the rounded borders that form the mesial and distal margins of the occlusal surface of a tooth.
an elevation of enamel that forms the proximal boundary of the occlusal surface of a tooth.
mar·gi·nal ridge(mahr'ji-năl rij) [TA]
1. An elevation of enamel that forms the proximal boundaries of the occlusal surface of premolars and molars.
2. An elevation on the mesial and distal portions of the lingual surface and, occasionally, the labial surface of incisors.