Exam 12: Incisors

The mandibular central incisor occludes with both the maxillary central incisor and the maxillary lateral incisor. Similar to other anterior teeth, a mandibular incisor is derived from five lobes, three facial lobes and two lingual lobes.

Which of the following are characteristic of one or both maxillary incisors (select all that apply)?

When incisors first erupt the incisal ridge is smooth. After the teeth have been in function for several months, mamelons, which aid in mastication, develop on the incisal ridge.

The mandibular lateral incisors are wider mesiodistally than the mandibular central incisors because the mesial developmental lobe of the laterals is larger than that of the centrals.

The teeth most likely to be peg-shaped are the mandibular lateral incisors because the distal developmental lobe is large and located more lingually than its mesial lobe.

Mandibular incisors do not have marginal ridges.