Which of the following features can always be noted on the primary maxillary central incisors?

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Unlike their permanent successors,the primary maxillary central incisors have no mamelons,leaving the labial surface smooth.In addition,these teeth rarely have developmental depressions or imbrication lines,and no pits are evident on the lingual surface.However,the cingulum and marginal ridges on the lingual surface all are more prominent than on the permanent successor,and the lingual fossa is deeper.Both proximal surfaces of the maxillary central incisor appear similar.

Which of the Following Features Can Always Be Noted on the Primary