Components in resin can diffuse to pulp via

Components in resin can diffuse to pulp via

• A. Enamel prisms
• B. Dentin tubules
• C. Tubules
• D. Odontoblast processes

Answer: (C)

Diffusion of resin components to the pulp happens through dentin, specifically via the dentinal tubules. These microscopic channels run from the pulp chamber out to the outer dentin and are surrounded by dentinal fluid that can carry dissolved resin molecules. Enamel prisms belong to enamel, which is not a pathway to the pulp, so they don’t support diffusion to the pulp. Odontoblast processes are extensions inside the tubules that reach toward the pulp, but they are not the diffusion route themselves—the tubules and the fluid within them are. The openness and number of tubules, along with dentin thickness and any smear layer or sclerosis, determine how readily resin components can diffuse toward the pulp.

Diffusion of resin components to the pulp happens through dentin, specifically via the dentinal tubules. These microscopic channels run from the pulp chamber out to the outer dentin and are surrounded by dentinal fluid that can carry dissolved resin molecules. Enamel prisms belong to enamel, which is not a pathway to the pulp, so they don’t support diffusion to the pulp. Odontoblast processes are extensions inside the tubules that reach toward the pulp, but they are not the diffusion route themselves—the tubules and the fluid within them are. The openness and number of tubules, along with dentin thickness and any smear layer or sclerosis, determine how readily resin components can diffuse toward the pulp.