Abstract
A model was constructed to represent an ideal removable partial denture situation with a standardized undercut. Nine chrome-cobalt alloy test frameworks, each representing a different clasp design, were fabricated according to the manufacturer's directions. The amount of force required to dislodge each framework from the model was recorded. The frameworks showed the following decreasing order of resistance to vertical displacement from an 0.02″ undercut: (1) “U” infrabulge clasp, (2) ring clasp, (3) Akers clasp, (4) Akers clasp with a wrought gold wire retentive arm, (5) “I” infrabulge clasp, (6) “I” infrabulge clasp with a wrought gold wire retentive arm, (7) Ney No. 2 clasp, (8) “T” infrabulge clasp, and (9) back action clasp.
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