Abstract: There is disclosed a system for recovering motor function after spinal cord injury, which has a mat having a first sheet made from a semi-conductive or insulating material and with a volume resistivity of less than 104 &OHgr;·cm and a second sheet made from a semi-conductive or insulating material, laminated on the first sheet and with a volume resistivity of 104 &OHgr;·cm or more; an electric power source; an electrical circuit to apply 25-800 VDC to the first sheet; and a control unit for the system. A person with spinal cord injury is made contact with the mat, so as to put his body in electrostatic field to be induced on the mat.

Abstract: A gallium alloy for dental restorations which is hardenable at mouth temperature or around 37.degree. C. or more after triturating multicomponent liquid gallium alloy with alloy powder, is disclosed. The mixture has a heterogeneous structure after hardening, and contains as the overall composition, 9-47% gallium, 1-35% indium, 0.2-38% tin and 1-68% silver as indispensable components and one or more elements selected from 0.4-35% palladium, 0.5-25% copper and 0.4-12% zinc as arbitrary components. The multicomponent liquid gallium alloy contains 45-85% gallium, 5-40% indium and 1-30% tin as fundamental components and small amounts one or more elements selected from silver, palladium, gold, platinium, copper, zinc and germanium as arbitrary components. The alloy powder contains 1-85% silver and two or more elements selected from 1-40% tin, 1-40% palladium, 1-30% copper, 1-15% zinc and 1-25% indium.