Cavity preparation produces what due to the action of bur or hand instruments on the calcified dentin matrix?

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Study for the Biocompatibility of Dental Materials Test. Prepare with multiple choice questions and detailed explanations to ensure you're ready for your exam!

Multiple Choice

Cavity preparation produces what due to the action of bur or hand instruments on the calcified dentin matrix?

Explanation:
When dentin is cut with a bur or hand instruments, the action disrupts the mineralized dentin matrix and leaves a very thin, adherent film on the surface and inside the tubules. This is the smear layer. It is composed of tiny dentin particles, hydroxyapatite crystals, and denatured collagen, often with trapped salivary proteins and sometimes bacteria. The smear layer can cover the dentin surface and partially block the tubules (smear plugs inside tubules), affecting how adhesives interact with dentin. Some bonding systems require its removal or modification for better resin penetration, while others are designed to work with it.

When dentin is cut with a bur or hand instruments, the action disrupts the mineralized dentin matrix and leaves a very thin, adherent film on the surface and inside the tubules. This is the smear layer. It is composed of tiny dentin particles, hydroxyapatite crystals, and denatured collagen, often with trapped salivary proteins and sometimes bacteria. The smear layer can cover the dentin surface and partially block the tubules (smear plugs inside tubules), affecting how adhesives interact with dentin. Some bonding systems require its removal or modification for better resin penetration, while others are designed to work with it.

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