Which teeth contain mamelons when newly erupted?

• A. Primary molars
• B. Permanent canines
• C. Permanent incisors
• D. Primary incisors

Answer: (C)

Mamelons are small, rounded protuberances commonly found on the cutting edges of newly erupted permanent incisors. These features are a result of the development process of the teeth and represent the three developmental lobes from which the incisors form. When the permanent incisors first emerge in the mouth, these mamelons can be seen on the incisal edge, giving the teeth a somewhat uneven appearance. As the individual wears their teeth through normal use, the mamelons typically wear away and smooth out over time.

In contrast, primary molars and primary incisors do not exhibit mamelons as they are designed with a different morphology suitable for their functions and are not derived from the same developmental pattern as the permanent incisors. Permanent canines also do not have mamelons since their development is primarily focused on a single cusp and not multiple lobes, unlike the incisors. Thus, the correct answer reflects the unique characteristics of the permanent incisors during their initial eruption.