A post-impression preparation technique can be used for preventing fracture of isolated abutments in master casts with extensive bone loss. This technique involves using a sharp knife to trim the impression obliquely at the clinical cervical line, creating a 1- to 2-mm-width bevel, followed by the insertion of a dowel pin into the abutment for reinforcement. This technique enlarges the abutments' diameter at the clinical cervical line and increases the resistance to breakage without altering the shape of critical areas.