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Direct retention: Close adaptation and proper contour of an adequately extended denture base and accurate fit of framework against multiple properly prepared guide planes should be used to help retentive clasp arms retain the prosthesis.
Clasp: The clasp should have good stabilizing qualities; remain passive until activated by functional stress.
Should be positioned strategically to achieve greatest possible control of stress.
Tripod configuration-in class 2 arches.
Bilateral configuration-in class 3 arches.
Class1 require only two retentive clasp arms, one on each terminal tooth.
For distobuccal undercut-vertical projection retention clasp is preferred.
For mesiobuccal undercut-wrought wire clasp is indicated.
Class2 should have three retentive clasp arms.
Rest: Teeth should be selected for rest preparation to provide maximum possible support for prosthesis.
Stress should be directed along long axis of teeth.
In all class 1 and 2 rest seat preparation is saucer shaped completely devoid of any sharp angles or ledges.
Indirect retention: It is essential and can be achieved by using mechanical advantage of leverage so that it counteracts the forces attempting to move denture base away from residual ridge.
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