The abutment consideration is but one step in the fabrication of a stable base appliance. This step, however, is a vitally important one. If carried out poorly, the casting can be lost and the tooth and periodontal tissues severely damaged or destroyed. All the steps considered in the fabrication of a case are like links of a chain. If one link fails the entire chain (or case) is broken or impaired. When the conditions of proper room for the attachment, crown contour, retention, and criteria of good preparation techniques and design are met, sound abutment considerations will be a strong link in the success of the attachment.