The purpose of immobile dental prosthesis is to repair extensive lesions and replenish missing teeth with restorations that are designed, manufactured and permanently bonded to existing natural teeth. The preservation and use of these teeth for restoration is necessary because the stomagnathic system losing all its physical teeth loses the ability of the proprioceptive organs of the periodontium that transmit to the central nervous system messages about the position of the moving parts, their degree of contraction, the dental contacts, the size and the hardness of the food and other objects interposed between the teeth.
Loose teeth can be replenished by installing bridges that are preferable to the rest of the mobile if the conditions allow. Patients, moreover, always prefer a fixed restoration from a mobile one. Since a bridge rests solely on existing teeth which are permanently bonded, its construction, its operation and its duration depend to a very large extent on the condition of the tooth supports, since in addition to the loads which they accept as individual units, they are burdened with the additional loads exerted on the bridging.