Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

Successful implant prosthesis begins with placing the fixture in correct 3 dimensional positions and directions. Fixture placement in an undesirable position must be overcome with restorative procedures. Usually, in such cases, cast-gold UCLA abutments have been used to make customized abutments. However, cast-gold UCLA abutments have limitations, such as increased expenses, casting defects, variable quality depending on the technician’s experience, and biocompatibility. These limitations will be overcome with computer aided design/computer aided manufacturing (CAD/CAM) customized abutments to which the latest CAD/CAM technology was applied. CAD/CAM customized abutment is regarded as a good alternative abutment for aesthetic and functional implant restoration. However, there are things to consider when using CAD/CAM abutment even with so many benefits. In order for soft tissue sculpting, like the cervical shape of natural tooth, it is necessary to secure 3~4 mm subgingival running room from a fixture top. It is recommended that the emergence angle that determines the subgingival contour of implant prosthesis is not more 40 degrees. If we understand the benefits of CAD/CAM abutment and keep the consideration factors in mind, I believe this tissue- and patient-friendly CAD/CAM abutment will be a great useful tool in our practice.