Fig. 2From: Effect of the level of alveolar atrophy on implant placement accuracy in guided surgery for full-arch restorations supported by four implants: an in vitro studyRadiopaque wax-covered screw heads are used to accurately superimpose STL data from the optical scan onto the DICOM data. STL, standard tessellation language; DICOM, Digital Imaging and Communication in MedicineBack to article page