How many pulp horns are present in a typical mandibular deciduous second molar?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (D)

In a typical mandibular deciduous second molar, there are a total of five pulp horns. Each pulp horn corresponds to the cusps of the tooth, and in this case, the mandibular second molar typically has three major cusps and two minor cusps. This anatomical structure results in the presence of multiple pulp horns, as each cusp develops its own pulp horn, extending into the crown of the tooth.

Specifically, the combination of the three well-defined cusps plus the two additional smaller cusps leads to a total of five pulp horns. This is a characteristic feature of the anatomy of primary teeth, where the pulp chambers tend to be larger and more complex compared to permanent teeth. Understanding this anatomical feature is essential for dental professionals when considering treatments and understanding the uniqueness of primary dentition.