National Dental Assisting Examining Board (NDAEB) Practice Exam

What is the lobe on the lingual surface of a permanent incisor called?

1. Cingulum

2. Incisal Edge

3. Labial Lobe

4. Lingual Ridge

The correct answer is: Cingulum

The lobe on the lingual surface of a permanent incisor is referred to as the cingulum. This anatomical feature is a convex area located at the cervical aspect (near the gum line) of the lingual surface of the incisor teeth. It plays an important role in the contour and aesthetic appearance of these teeth as it contributes to the overall shape and function by providing support for the incisal edge and assisting in proper alignment and occlusion during biting and chewing. The cingulum serves as a site for the attachment of periodontal fibers and influences the shape and contour of the dental arch. Its presence is significant for both phonetics and aesthetics, as it contributes to the visual parameters of a well-formed anterior segment of the dentition. In contrast, the incisal edge refers to the cutting surface of the incisor teeth and does not pertain to the lingual area. The labial lobe is associated with the facial or labial surface of the teeth, specifically the area that faces the lips and is not related to the lingual surface. The lingual ridge is a raised feature that runs along the midline of the lingual surface of canines but does not designate the specific lobe associated with incisors. Hence,