Studies on the permeability of polyacrylate and phosphate cements by means of 131I

The permeability of a zinc phosphate cement and of a typical representative of the polyacrylate cements was studied radiometrically and autoradiographically, using 131I. The permeability of the phosphate cement was considerably greater than that of the polyacrylate cement. However, further studies evidenced that the penetrability of the polyacrylate cement increased markedly, which might be due to the contraction of the material. Compared with the findings of previous studies the permeability of a phosphate cement frequently used revealed to be equal to that of EBA cements and polyacrylate cements during the first day of setting. Thus, the EBA cements and the polyacrylate cements are not superior to zinc phosphate cements in this respect. (author)