A pre-condition for the successful use of dental implants is a sufficient quantity of bone. Controlled bone regeneration has been developed in order to augment defective bone and enable the insertion of dental implants in jawbone areas with defective bone. Controlled bone regeneration with granular bone replacement material combined with collagen membranes is currently the most widely used and best documented method for bone augmentation around dental implants.
The main problem with this procedure using granular bone replacement material combined with a collagen membrane is its lack of stability, which frequently leads to a partial loss of the built-up area. This randomised clinical study at the University of Zurich has shown that the use of customised blocks of bone replacement material leads to a more successful build up of bone volume than the standard technique using granular bone replacement material.