Which dentin type is formed after eruption?

Which dentin type is formed after eruption?

• A. Primary dentin
• B. Secondary dentin
• C. Tertiary dentin
• D. Sclerotic dentin

Answer: (B)

After eruption, dentin continues to be laid down at the pulpal surface in a slow, ongoing process called secondary dentin formation. Odontoblasts stay active life-long and deposit dentin gradually, which causes the pulp chamber and canals to narrow a bit over time. This distinguishes it from primary dentin, which forms before eruption during tooth development; tertiary dentin, which forms in response to injury or stimuli (reactive or reparative dentin); and sclerotic dentin, which is not newly formed but a aging-related change where tubules become mineralized and dentin becomes harder and less permeable. Thus, secondary dentin is the type produced after eruption as a normal, continuous part of dentin maturation.

After eruption, dentin continues to be laid down at the pulpal surface in a slow, ongoing process called secondary dentin formation. Odontoblasts stay active life-long and deposit dentin gradually, which causes the pulp chamber and canals to narrow a bit over time. This distinguishes it from primary dentin, which forms before eruption during tooth development; tertiary dentin, which forms in response to injury or stimuli (reactive or reparative dentin); and sclerotic dentin, which is not newly formed but a aging-related change where tubules become mineralized and dentin becomes harder and less permeable. Thus, secondary dentin is the type produced after eruption as a normal, continuous part of dentin maturation.