The altered-cast procedure is a definite step toward the preservation of the remaining oral structures. It will provide better removable partial denture service to patients. The technique for the altered-cast procedure has been described. This technique produces the following results: 1. Remarkable stability in the denture base region of distal extension removable partial dentures. 2. A positive occlusion which will be maintained for long periods of time. 3. Reduced stress on abutment teeth from unfavorable forces. 4. Reduced numbers of postinsertion adjustments.