The thicker the dentin, the _____ the protection.

The thicker the dentin, the _____ the protection.

• A. Worse
• B. Better
• C. Unchanged
• D. Variable

Answer: (B)

Dentin thickness acts as a barrier that limits the diffusion of chemicals and irritants from restorative materials to the dental pulp. The thicker the dentin, the longer the diffusion path, so fewer irritants reach the pulp and the pulp is better protected. In practice, preserving dentin thickness or sealing tubules with liners can enhance this protective effect. If dentin is very thin, even small amounts of resin monomers, acids, or heat can reach the pulp and potentially cause a pulpal response. The other options would imply more risk, no change, or unpredictable protection, which doesn’t fit how diffusion through dentin works.

Dentin thickness acts as a barrier that limits the diffusion of chemicals and irritants from restorative materials to the dental pulp. The thicker the dentin, the longer the diffusion path, so fewer irritants reach the pulp and the pulp is better protected. In practice, preserving dentin thickness or sealing tubules with liners can enhance this protective effect. If dentin is very thin, even small amounts of resin monomers, acids, or heat can reach the pulp and potentially cause a pulpal response. The other options would imply more risk, no change, or unpredictable protection, which doesn’t fit how diffusion through dentin works.