Abstract: An object is to provide an attachment for a denture which is difficult to have a fault if external force is applied. The attachment includes a convex element that is a top structure of an anchor tooth or an artificial tooth root, and a concave element that is fixed to a denture base. The convex element includes a fitting part and a coupling part that couples the fitting part to a natural tooth or the artificial tooth root. The concave element includes a main body in which a hollow portion where the fitting part is inserted is formed, a groove in an internal circumferential face of the main body in a direction of a circumference, an o-ring that is fit into the groove and whose inner diameter is smaller than the fitting part, and a discharge channel via which the hollow portion and an outside communicate.

Abstract: A mixing sheet capable of mixing multiple types of mixed materials filled therein, simply formed, easily manufacturable, and enabling a reduction in the residual amount of the mixed materials thereon after servicing. The mixed materials are passed, for mixing, through a first mixing passage formed between first outer frame members (21) and partition members (23) and second mixing passages formed between second outer frame members (22) and the partition members (23). The first mixing passage and the second mixing passage are formed by joining the first outer frame members (21) to the partition members (23) and the second outer frame members (22) to the partition members (23). These first mixing passage and the second mixing passage comprises a plurality of elements arranged in series.