Abstract
We tried to embed HY-preparation with the zinc oxide eugenol cement as the base material to the inner surface of denture base to which the abutment might contact. We reported that it was useful to prevent caries of the overdenture abutment teeth. But we anticipated solubility of the embedded HY-preparation might gradually decrease.
In this study we measured the F-ion solubility in the HY-preparation and examined the gradual change of its solubility in vitro, and examined clinically the caries activity of five subjects with overdenture and obtained the following results.
1) The F-solubility in both distilled water and artificial saliva almost had the same increasing tendency.
2) The F-solubility of the preparation, with zinc oxide eugenol cement in powder-liquid ratio of 6: 1 and 12: 1, had almost the same increasing tendency.
3) The solubility of HY-preparation to artificial saliva per day was larger in the early stage and gradually decreased thereafter, but after 24 weeks the solubility was almost nil. The solubility period of R2-group with larger surface area was longer than that of R1-group.
4) We examined clinically caries activity with the Cariostat. It was lower after 3 months than on the time we had embedded the HY-preparation in the cavity.
