A pontic is attached to a retainer by a connector. Connectors can be rigid or nonrigid. Nonrigid connectors take the form of male- and female-locking arrangements. Rigid connectors are classified as either cast or soldered.abutments. It is almost mandatory that an FPD be supported by an abutment at both ends. This requirement is waived in special situations. When a pontic is suspended from only one retainer, it is cantilevered.
A number of teth can share a load being placed on one of them. This helps prolong the life of loose teeth or those that have lost supporting bone. Stabilizing a mobile tooth or teeth is called
splinting. When stabilizing adjacent teeth with connected castings that are cemented in the mouth, the prosthesis becomes a form of
fixed splinting. Such splints are made in the same fashion as an FPD.
This type of fixed prosthesis is made of a single pontic and thin metal retainers located both proximally and lingually on the abutment teeth. The retainers are specially designed metal-extensions (wings). The FPD is retained by a resin bond between the acid etched abutment teeth and the metal surface of the retainer. A missing left central incisor is illustrated in A of figure 8-6. A fabricated Maryland bridge is illustrated in B of figure 8-6. The bridge in place from the lingual aspect is illustrated in C of figure 8-6. A posterior resin-bonded FPD is shown in figure 8-7.
This is a rigid, temporary restoration that replaces missing teeth and is generally made from a self-cutting resin. Its purpose is to protect cut tooth surfaces and hold the abutment teeth in position while the definitive FPD is being fabricated in the dental laboratory.
Figure 8-6. - Anterior resin-bonded FPD (Maryland bridge).
Figure 8-7. - Posterior resin-bonded FPD (Maryland bridge).
The three basic types of removable prosthetic prostheses are complete dentures, removable partial dentures, and overdentures. There are variations of each of these types. 8-4