Rests and rest seats

By Dr.Swathi Pai on Saturday, January 17, 2009 with 0 comments

Primary purpose: to provide vertical support for the RPD

-it maintains established occlusal relationships by preventing settling of the denture

-prevents impingement of soft tissues

-directs and distributes occlusal loads to abutment teeth

Form of the occlusal rest and rest seats:

The outline form should be a “rounded” triangular shape with the apex toward the center of the occlusal surface.

It should be as long as it is wide and the base of the triangular shape should be at least 2.5mm for both molars and premolars.

The marginal ridge of the abutment tooth at the site of the rest seat must be lowered to permit a sufficient bulk of metal for strength and rigidity. This means that a reduction of the marginal ridge of about 1.5mm is usually necessary.

The floor of the occlusal rest should be apical to the marginal ridge and be concave or spoon shaped (no sharp edges or line-angles in the prep).

The angle formed by the occlusal rest and the vertical minor connector from which it originates should be less than 90°.

Category: Prosthodontics Notes



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