They are abutments holding removable prostheses based on rigid prostheses like (geşhibe, teleskop, bono, ataşman). These systems are locking systems and the holding arm, crochet, is invisible. The most important advantage of the use of these systems, instead of non-aesthetic metal crochets, is that they are completely invisible. They require special technique and equipment to be placed. In these prostheses, holders resemble snap-on systems. Natural teeth are crowned. One part of the holder takes place on the crown while the other takes place on the removable unit. When the prosthesis fits into the mouth, removable part is locked to the rigid unit along with cosmetic integrity.
 
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