Number of odontoblast cells present in the pulp/mm2 is
**Core Concept**
The question is testing the knowledge of odontoblast density in the dental pulp. Odontoblasts are specialized cells responsible for the formation of dentin, a hard tissue covering the pulp. The density of odontoblasts is an important factor in the maintenance of pulp health.
**Why the Correct Answer is Right**
The correct answer is 350-400 odontoblast cells per square millimeter of pulp. This is based on the histological studies of dental pulp, which have shown that the density of odontoblasts varies between individuals and is influenced by factors such as age and tooth location. The presence of a sufficient number of odontoblasts is essential for the continuous formation of dentin and the protection of the pulp from bacterial invasion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is too low. A density of 100-150 odontoblast cells per square millimeter would be insufficient for the maintenance of pulp health.
**Option B:** This option is incorrect as it is too high. A density of 500-600 odontoblast cells per square millimeter is not supported by histological studies.
**Option C:** This option is incorrect as it is not a valid answer choice.
**Clinical Pearl / High-Yield Fact**
The density of odontoblasts is an important factor in the diagnosis of pulpitis. A decrease in odontoblast density can be an indicator of pulp inflammation or necrosis.
**Correct Answer:** A. 350-400 odontoblast cells per square millimeter of pulp.