Penetration of Radioactive Isotopes through Enamel and Dentin. I. Diffusion of Na 22 in Fresh and Coagulated Dental Tissues

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Abstract
The diffusion of Na22 labelled NaC1 in untreated and coagulated human dental hard tissues was studied in-vitro. The material consisted of 7 pairs of homologous intact human premolars; one of each pair was boiled in Ringer solution for 5 minutes. The boiling and coagulation had a marked effect on the diffusibility of Na22, which was diminished to 1/2 or 1/3 of that in the untreated tooth. If the organic stroma in the hard tissues in-vivo is, partly in a gel form, the delaying effect is produced by the denaturation of the protein-mucopolysaccharide comples. The coagulation in this case was due to toiling the tooth, but other coagulating agents have the same effect.

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