Abstract
An in vitro study was done to evaluate the relative effectiveness of clasp placement in specific obturator framework designs. Three commonly encountered defects were studied. These included (1) the antero-hemimaxillectomy, in which the only remaining dental support is from canine to second molar on one side; (2) the hemimaxillectomy, in which the defect extends the length of the midpalate to the mesial surface of the central incisor; and (3) the partial or posterior maxillectomy, in which all six anterior teeth remain along with all posterior teeth on the nondefect side. Three frameworks that demonstrated the following design characteristics were made for each cast: (1) full lingual plate with buccal retentive arms, (2) lingual retention with buccal reciprocation, and (3) buccal and lingual retention.
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