Abstract
To obtain good-fitting crown restorations made from pure titanium, the present study compared the fitness of crowns fabricated using a machining process in a dental CAD/CAM system with that using a casting procedure. Crown specimens were prepared using two different types of models(abutment tooth model prepared for full crown and the standard master die) by CAD/CAM system or by casting procedures with two different investment materials. The fitting test for crown specimens was carried out to examine the effects of fabrication methods on the fitness of a pure titanium crown restoration. The following results and conclusions were obtained. 1.Crown specimens made using dental CAD/CAM showed adequate machining accuracy. 2.There was no remarkable effect of crown thichness on the fitness of crowns made using dental CAD/CAM. 3.The fitness of cast crown specimens was influenced by differences in thickness of the crown and types of mold materials. 4.The line angles of the abutment tooth affected the fitness of crown specimens made using either dental CAD/CAM or casting.
