title: A three-dimensional image-superimposition CAD/CAM technique to record the position and angulation of the implant abutment screw access channel.
abstract: Cement-retained, implant-supported restorations have advantages over screw-retained restorations, but retrievability can be a problem. By using computer-aided design and computer-aided manufacturing (CAD/CAM) technology, a working cast or mouth can be scanned, and a definitive record of the screw hole can be made in 3 dimensions and saved as a file. This information includes not only the position of the opening of the screw hole but also its angulation and orientation, which can be retrieved if required.
authors: Tufts University School of Dental Medicine, Boston, MA 02111-1527, USA.
authors: Jong-Il
authors: JI
authors: Park
authors: Tae-Ho
authors: TH
authors: Yoon
mesh_terms: D002484:Cementation; D017076:Computer-Aided Design; D059605:Dental Implant-Abutment Design / Q000379:methods*; D017268:Dental Prosthesis Retention / Q000379:methods*; D019094:Dental Prosthesis, Implant-Supported; D020878:Device Removal; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000295:instrumentation / Q000379:methods*; D013382:Subtraction Technique