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1 Department of Pedodontics, College of Dentistry, University of Iowa, Iowa City, Iowa 52240, USA, and Department of Geological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois
After immersion for 30 seconds in stannous fluoride, tin and fluorine were detected in enamel. When the enamel was immersed for a longer time, it was etched by stannous fluoride treatment. A second tin-rich zone formed on the enamel surface after prolonged exposure and possibly consisted of Sn3F3PO4 and a hydrated tin compound.
Submitted on December 21, 1972
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