Fig 1.
Schematic diagram of the dentin permeability testing setup.
Table 1.
Brand name, manufacturer and major components of the dentin desensitizing products.
Fig 2.
Reduction in dentin permeability, expressed as a percentage of the respective baseline permeability (100%) value of each individual dentin crown segment, after the application of 4 dentin desensitizers that had been aged for 3 time periods.
Values represent means and standard deviations (n = 14). 1X: one application; 3X: three applications. For 24 h, desensitizer treatments labeled with the same upper case letters are not significantly different (P > 0.05). For 48 h, desensitizer treatments labeled with the same lower case letters are not significantly different (P > 0.05). For 7 days, desensitizer treatments labeled with the same numerical designators are not significantly different (P > 0.05). For time periods within each desensitizer treatment modality, pairwise comparisons of the three periods in the TM 1X group (linked with a black line) are all significantly different (P < 0.05). There are no significant differences for pairwise comparisons of time periods in the other three treatment groups.
Fig 3.
Scanning electron microscopy images (left: low magnification at 5,000–10,000x; right: high magnification at 30,000x) of the extent of tubular occlusion in human coronal dentin after 24 h of treatment with the four desensitizer treatments.
Dentinal tubules had been rendered patent prior to desensitizer application, as confirmed with control dentin specimens without desensitizer application. ID: mineralized intertubular dentin. A. VLA. Pointers: tubules containing intratubular globular deposits. B. VAN. Open arrowheads: occluded dentinal tubules. C. One application of TM. Open arrows: completely occluded tubules. D. Three applications of TM. Open arrows: completely occluded tubules.
Fig 4.
Scanning electron microscopy images (left: low magnification at 5,000–10,000x; right: high magnification at 30,000x) of the extent of tubular occlusion in human coronal dentin after 7 days of treatment with the four desensitizer treatments.
ID: mineralized intertubular dentin. A. VLA. Pointers: partially-occluded dentinal tubules. B. VAN. Open arrowheads: partially-occluded tubules. C. One application of TM. Open arrows: completely occluded tubules. D. Three applications of TM. Open arrows: completely occluded tubules.
Table 2.
Solubility product constants (Ksp) at 25°C.