The effect of 25% tannic acid on prepared dentin: a scanning electron microscope-methylene blue dye study.

@article{Bitter1990TheEO,
  title={The effect of 25% tannic acid on prepared dentin: a scanning electron microscope-methylene blue dye study.},
  author={Norman C Bitter},
  journal={The Journal of prosthetic dentistry},
  year={1990},
  volume={64 1},
  pages={12-6}
}
The effect on the permeability of prepared dentin treated with 25% tannic acid and 6% citric acid was compared with the untreated dentinal surface. Methylene blue was applied to the dentin surface after treatment to evaluate penetration into dentinal tubules. The tannic acid solution reduced or prevented dye penetration of the dentinal tubules. Citric acid treatment permitted severe penetration. The 25% tannic acid solution removed the smear layer while inhibiting penetration of the dye. 

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