Rest Seats

An adequate amount of tooth structure must be removed to allow for a minimum metal thickness of

1 mm in the area of an occlusal rest seat. To achieve adequate reduction, some operators prepare a rest seat in the tooth before starting the retainer preparation. They then use 1-mm reduction grooves to ensure adequate thickness. Although this approach can work well, problems may occur if it becomes necessary to alter the position of the rest seat during the laboratory phase. Preference therefore should be given to the slightly less conservative approach seen in Figure 21-19 because it can be extremely helpful to be able to move the rest seat. Often esthetic needs, such as the interproximal extent of a cutback for a metal-ceramic restoration, can be assessed only on the laboratory bench during waxing procedures.

Rpd Rest Seats
Fig. 21-19. Teeth prepared for RPD retainers. The rest seat preparation (arrows) allows some adjustment of rest seat location during the waxing phase.
Retainer For Teeth Designs

Fig 21-20. Abutment crowns contoured to precisely receive the RPD clasp.

(Courtesy Drs. K. Seckler and J. Janaowski.)

Fig 21-20. Abutment crowns contoured to precisely receive the RPD clasp.

(Courtesy Drs. K. Seckler and J. Janaowski.)

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  • valentin
    WHAT IS AN INTERPROXIMAL REST SEAT?
    8 years ago

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