The ball structure is a classic attachment of full dentures on implants and can optionally be equipped with standard matrices or TIMA matrices (from Unor, Switzerland). The default matrix is equipped with replaceable retention rings which are readily resilience. The peel force may be controlled by retention rings of different degrees of hardness. Each kit includes a soft and a hard retention ring. The closed TIMA matrix from titanium receives its retaining force by a replaceable ring spring made ​​of high-strength special steel, which can be replaced by simple screwing of the matrix. The ring springs are also available in different degrees of hardness.The ball abutments are available in gingival heights of 2mm and 4mm.