CAD/CAM materials CAD–CAM DICOM–STL Medicine accuracy alveolar remodeling bone level clinical study complications computer-aided surgery cone-beam computed tomography dental implant dental implants digital dentistry digital impression digital workflow dimensional measurement accuracy elderly population emergence angle emergence profile full-arch impression guided surgery image-guided surgery imaging superimposition implant scan implant-supported restorations implantology impression techniques intraoral digital scanning intraoral scan