CAD/CAM system to fabricate dental prostheses--CAD for bridge restoration

An original CAD process for bridge restoration was developed, and CAD for a maxillary left three unit bridge was attempted. The measured shape data of the standard crown of a second premolar and molar were deformed, and were applied on the dies. The measured pontic data were inserted between two molars. Here, bite data of the opposing teeth were introduced, and the occlusal relationship with the applied molars was adjusted. The bite data were then replaced by the FGP data, and the occlusal surface interference with FGP data was eliminated. Connection processes were then carried out. The clearances between the pontic and molars were filled with interpolation, and the ends of the applied second molar and premolar were connected with the margin of each die. Finally, the data above the margin of each die were extracted, and used as the inner crown data for the bridge. The whole bridge was designed using a newly developed computer program.