[Two-stage method of enamel remineralization]

Two toothpastes were compared in vitro for assessing the effectiveness of a two-stage process of enamel remineralization after damage inflicted by means of acid. One paste contained added free anions essential for the remineralization process, the other paste contained analogous free cations. The remineralization process was based on sorption of free PO4(3-) or Ca2+ ions at the site of damaged enamel and development of calcium phosphate in situ. The study was carried out using phosphorus and calcium radioisotopes, electron microscope and X-ray microanalyzer.