Calcium hydroxide is used in deep cavity because it is:
- A. Simulate formation of 2nd dentine.
- B. Not irritant to the pulp.
- C. For thermal isolation.
The correct option for why calcium hydroxide is used in deep cavities is: A. Simulates the formation of secondary dentin.
Here's the explanation for each option:
A. Simulates the formation of secondary dentin:
This is the primary reason for using calcium hydroxide in deep cavities. It has the ability to stimulate the production of new dentin by the pulp, which helps to protect the remaining vital pulp tissue and potentially avoid the need for more invasive procedures like root canals.
B. Not irritant to the pulp:
While calcium hydroxide is generally considered less irritating than other materials, it can still cause some irritation to the pulp, especially if placed directly on it. This is why it's crucial to apply it only in specific areas with minimal remaining dentin and followed by an additional protective layer like resin-modified glass ionomer (RMGI).
C. For thermal isolation:
While calcium hydroxide has some insulating properties, it's not its primary purpose in deep cavities. Other materials, such as glass ionomer cements, are generally preferred for thermal insulation.
Therefore, simulation of secondary dentin formation (option A) is the most accurate reason for using calcium hydroxide in deep cavities.
