PPT Slide
FACTORS THAT DETERMINE DENTINE PERMEABILITY
- Diameter and patency of dentinal tubules. Hydraulic conductance reduced by smear layer, But smear layer may be permeable to small molecules.
- Tubule contents. Electron-dense material in tubules Space around odontoblast processes
- Tight junctions between odontoblasts. Open when dentine exposed
- Outward flow in dentinal tubules Depends on hydraulic conductance of dentine and pulpal tissue fluid pressure