[Study on the setting reaction of the zinc phosphate dental cement (2). The setting reaction of cement substituted magnesia clinker for zinc oxide (author's transl)].

In previous paper it has been reported by author that setting of the zinc phosphate cement is due to precipitation of amorphous aluminium phosphate rather than zinc phosphate. If such the setting reaction on the zinc phosphate cement is right, there is no necessity that cement powder is zinc oxide clinker. In this paper magnesia clinker is substituted for zinc oxide, and the reaction products of set cement are examined by the same methods as having shown in previous paper. When commercial cement liquid is used for mixing with magnesia clinker, the reaction products become amorphous for effects of Al3+ in liquid. These are the same amorphous reaction products as precipitating in set zinc phosphate cement. From result in previous and this paper, it has been made sure that setting reaction of zinc phosphate cement is due to precipitation of amorphous aluminium and zinc (in liquid) phosphate.