Multiple choice

The pulp chamber of the maxillary first molar is the largest in the dental arch with the pulpal roof being

  1. rhomboidal shape in cross-section

  2. trapezoidal shape in cross-section

  3. triangular shape in cross-section

  4. obtuse triangle shape in cross-section
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A Correct answer
Explanation

The arrangement of the four pulp horns; (mesiobuccal, distobuccal, mesiopalatal, and distopalatal) gives the pulpal roof, a rhomboidal shape in cross-section. As the four walls converge towards the floor, where the lingual wall almost disappears, the floor of the pulp chamber appears triangular in cross-section.

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