Cleaning time and fate of phosphoric acid as conditioning agent on human dental enamel and dentin. An in vitro radiotracer study |
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| Authors: | M Nagi A Alian |
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| Institution: | (1) Faculty of Oral and Dental Medicine, Cairo University, Cairo, (Egypt);(2) National Centre for Radiation Research and Technology, Atomic Energy Establishment, Cairo, (Egypt) |
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| Abstract: | In this study the cleaning time and fate of phosphoric acid on human dental enamel and dentin has been investigated, using
the radioactive tracer technique with32P as an indicator of phosphorus. Twenty seconds were found to be sufficient for cleaning the enamel from phosphoric acid,
which is used for conditioning, and from formulations produced from its interaction with enamel. It was also found that dentin
protection is necessary before conditioning with phosphoric acid due to the retention penetration of the latter through subsurface
dentinal tubules. In addition, there seems to be an interaction between phosphoric acid and Ca(OH)2 leading to the formation of a sparingly soluble compound. |
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