Q: The rounded “bumps” on the incisal edges of an anterior tooth are called:
(D). Height of contour
Mamelons are rounded protuberances present on the cutting edge of incisors when they first erupt. The mamelons wear out over time with normal wear against external objects and teeth of the opposite arch. If the mamelons on the anterior teeth are still present as an adult, this may indicate that the anterior teeth do not touch when positioned edge to edge (no vertical overlap).
Let’s look at the definition of the other answer choices:
o Cusp: rounded elevation on the occlusal surface.
o Cingulum: rounded elevation (convexity) on the lingual surface at the cervical third (near CEJ) of anterior teeth.
o Height of contour: also called the crest of curvature, it is the greatest bulge farthest from the center of the crown of the tooth.
Answer: A. Mamelons
Mamelon means “nipple” in French. Go spread your new knowledge! Let’s learn a little more about the cingulum today. We already know that cingulum is the rounded part on the lingual side of the anterior teeth. Here are other important details you MUST know for the dental hygiene board exams (NBDHE, NDHCE).
o V-shaped ridge is identifiable above the cingulum.
o Major lingual fossa is noticeable above the cingulum.
o All anterior teeth are formed from four centers of development, referred to as lobes. Three are located on the facial side of the tooth, and one on the lingual side. This lingual lobe will become the cingulum.
o Maxillary anterior teeth have a larger, well-developed cingulum, while the mandibular anterior have smoother and rounded cingulum.
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