What is the outline form of an occlusal rest seat preparation?
The outline form of an occlusal rest seat should be a rounded triangular shape with the apex toward the center of the occlusal surface (Figure 6-2). 2. It should be as long as it is wide, and the base of the triangular shape (at the marginal ridge) should be at least 2.5 mm for both molars and premolars.
What is occlusal rest seat?
Occlusal rest: – A rest placed on the occlusal surface of a bicuspid or molar. Lingual (Cingulum) rest: – A rest placed on the cingulum of an anterior tooth. (usually the canine). Rests may also be placed on the lingual of posterior teeth by. creating a ledge of the tooth surface (prescribed for surveyed crowns).
What are rest preps?
A REST PREPARATION or REST SEAT is any portion of a tooth or restoration properly prepared to receive a rest.
What is Fulcrum line in RPD?
A fulcrum line is an imaginary line around which an RPD will tend to rotate. Fulcrum lines may be in the horizontal, frontal or vertical plane. Indirect retainers provide resistance to rotational movement of a distal extension RPD away from the denture bearing tissues around the retentive fulcrum line (Figure 2).
How deep should rest seats be?
Figure 6: Rest seats on posterior teeth The rest should be at least 1 mm thick for adequate strength.
What is proximal plate?
Proximal plates extend from the proximal facial line angle of the tooth to, or slightly past, the proximal lingual line angle of the tooth. They are thin mesiodistally and taper slightly toward the occlusal (incisal). They extend from the occlusal/incisal of the tooth to the major connector.
What is a fulcrum line?
What is stress breaker in RPD?
❑ A stress breaker is something like a hinge joint placed within the. denture framework, which allows the two parts of the framework. on either side of the joint to move freely. ( Mc Cracken)
What are the components of RPD?
The four basic components involved in an RPD are the artificial teeth, the denture base, retainers, and connectors (Figure 3.17). Figure 3.17. A mandibular RPD was made to restore a Kennedy II defect dentition. Artificial teeth are used to replace missing teeth and restore their function.
What is difference between piers and columns?
E.”) A pier is generally much larger than a column and is usually made of stone, brick, or concrete. Piers act as vertical supports for masonry constructions such as arcades.