PASSIVE FIT OF CAD\CAM FRAMEWORKS DESIGNED BASED ON VIRTUAL IMPLANT POSITIONS VERSUS ACTUAL IMPLANT POSITIONS: A PILOT INVITRO STUDY

Abstract Aim: To evaluate the passive fit of CAD/CAM implant supported frameworks that are constructed before and after implant placement. Methodology: A sample of 5 Kennedy class I models that loaded with 10 models bilaterally. In the first group, 3 implants were installed using full guided protocol and loaded with 3 units screw retained metal framework that constructed before implant placement based on virtual implant positions in aid of full digital work flow. While the second group was the control group, in which 3 implant were installed and loaded with 3 units screw retained metal frameworks constructed after implant installation based on their implant positions. The frameworks were screwed to multi-unit abutments seven tests were carried out to assess passive fit of the frameworks. These tests were visual, tactile test using examination probe, floss slippage, one screw test , screw resistance test and fit checker. Radiographs were done in conjunction with these tests to assess presence of gaps at abutment –framework interface.