The permanent mandibular second molar differs from the permanent mandibular first molar in number of ______________?
Correct answer: A. Cusps
- A. Cusps
- B. Roots
- C. Lingual grooves
- D. Marginal ridges
Explanation
The mandibular first molar usually has five cusps, whereas the mandibular second molar has four cusps arranged in a more symmetrical pattern. Both normally have two roots, so cusps provide the distinguishing difference here.
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