What would you NOT expect to find in tooth #8 (maxillary right central incisor) of a 21-year-old patient?

Mamelons are the three rounded protuberances found on the incisal edge of newly erupted incisors, formed by the developmental lobes of the tooth. They are typically worn away through attrition by the time a patient reaches adolescence, as normal occlusal function removes them. In a 21-year-old, mamelons should be absent unless the patient has an open bite (no incisal contact). The lingual fossa, cingulum, and mesial and distal marginal ridges are all permanent anatomical features of the maxillary central incisor that persist throughout life.