| abstract |
One aspect of the present invention provides a modified hydrogel characterized in that at least a part of the carboxyl group (-COOH) located in the side chain of the polymer constituting the hydrogel is modified and represented by the following formula, and a gingival expander comprising the same. <expression> P- (COO -) n A n + In the above formula, P is the main chain of the polymer, n is an integer from 1 to 3, A is composed of Na, K, NH 4 , Ca, Ng, Zn, Fe, Al, Sn, Cu, Ni, Mn, W, Co, Ag, Pb, Au, Pd, Pt, Ti and combinations of two or more of these It is one selected from the group. |