Preliminary investigations demonstrated that salts tartrate solutions are able to create a layer of non-homogeneous crystals able to close dentainal tubules and reduce fluid flow rate calculated using a pressur apparatus. The aim of this study was to evaluate the ability of a new solution constitued by tartaric acid (TA) solutions 0.1M (Ph 3.5) 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 1m edta for 2 mins to remove the smearl layer and to calculate the maximum rate for each disc. 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. EDTA 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 reduced the fluid flow rate (p<0.0001), and modified smearl layer morphology. These treatments my contribute the dentin protection from diet acid attacks and may reduce dentin hypersensitivity.
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