抄録
Diamine silver fluoride has been used to prevent the progress of dental caries and desensitize hypersensitive teeth. Unfortunately, diamine silver fluoride stains teeth black. We have prepared ammonium hexafluorosilicate (9000 ppm SiF) to overcome this drawback. It was found that SiF occludes open dentin tubules completely with silica-calcium phosphate precipitate, and thus SiF is useful for treatment of dentin hypersensitivity. It is unclear how effects SiF concentration on occluding ability of dentin tubules and composition of precipitate formed in dentin tubules. The purpose of this study was to evaluate the effect of SiF concentration for the clinical use as dentin hypersensitive treatment. Several concentrations of SiF solutions (from 100 ppm to 19400 ppm) and simulated hypersensitive dentin disks were prepared. Occluding ability of dentin tubules after SiF treatment was evaluated with scanning electron microscope (SEM) observation and composition of the precipitate formed in dentin tubules after SiF treatment was analyzed with energy dispersive X-ray analysis (EDXA). SEM observation demonstrated that open dentin tubules were completely occluded with the precipitate regardless the concentration of SiF solution. However, composition of the precipitate formed in dentin tubules was gradually changed with the concentration of SiF solution. The Ca/P molar ratio of the precipitate formed in dentin tubules was increased with the concentration of SiF solution. It was concluded that occluding ability of dentin tubules was the same regardless of the concentration of SiF solution. However, the composition of the precipitate formed in dentin tubules was governed by the concentration of SiF solution.
