Retentive Areas........
q Amount of desirable undercut …
q 0.01 inch-at the mesiobuccal distolingual line angle
- gingival 3rd of the clinical crown
- when the cast chrome alloy is used for framework
q I bar design is used when the undercut is more on the center of the facial surface
q If large molars or if gold is to be used instead of chrome , slightly deeper undercut is necessary
0.015 inches
q If wrought wire combination is used
0.020inches (Coz of greater flexibility of the wrought wire )
q Ideally, retentive clasps should be bilaterally opposed.
q Similar retentive areas should exist on all principal abutment teeth
THE AMOUNT OF RETENTION SHOULD ALWAYS BE THE MINIMUM NECESSARY TO RESIST A REASONABLE DISLODGING FORCE
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