The textbook authors and your lecturers recommend that, after mouth preparations, an impression be made in irreversible hydrocolloid and a cast poured in quick-setting stone. The purpose of this is to
- determine the proper size of stock tray for reversible hydrocolloid
- maximum resident benefit
- make a cast available to the laboratory for final waxing and casting
- evaluate the contours of the occlusal rests for adequate reduction
- verify that proper contours have been provided on the potential abutment teeth
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