Hydraulic Conductance in Vitro of Human Dentin after application of Tartrate Solutions.

Hydraulic Conductance in Vitro of Human Dentin after application of Tartrate Solutions.The aim of this study was to evaluate the ability of two solutions 0.1M NaKC4H406 and (CH3COO)2Ca to reduce in vitro the rate of fluid flow, also defined as dentin permeability (Lp). Dentin disc from human molars (N=48) were prepared and treated with 35% phosphoric acid for 2 mins to remove the smearl layer. The discs were connected with an hydraulic pressure apparatus working at 0.5 psi(Pashley, 1984). Fluid flow of 100% was assigned (Group A). A new smearl layer was re-created only in 24 samples (Group B).Solutions were applied for 2 mins and gently washed with water for 30 seconds, and fluid flow rate re-measured. Phosphoric acid was then re-applied for 2 mins, washed and fluid flow re-calculated.SEM analysis was performed for several samples.Results and Conclusions: The application of tartrate solution did not reduced the fluid flow rate, but prevented the removal of smearl layer by the second acid attack. These treatments my contribute the dentin protection from diet acid attacks.