Presurgical digital design and fabrication of the template
The 3D CBCT data was exported as a Digital Imaging and Communications in Medicine (DICOM) file. The CBCT data (DICOM format) along with the optical scanning data of the mandibular master model (STL format) were imported into the implant planning software (Simplant, v11.04; Dentsply Sirona, Ballaigues, Switzerland) to design the ideal implant position. The optical scanning data were aligned with the CBCT data, and a prosthetic-driven virtual set-up was created. The implant position was designed based on the virtual prosthesis and anatomical structures, by all the students and instructors individually first. The optimal implant position for the final surgical guide design was determined and approved by all the 10 instructors, as shown in Fig. Presurgical digital design and fabrication of the surgical template. After the implant position had been planned, a tooth-supported fully guided drilling template (CEREC Guide Bloc medi; Dentsply Sirona) was designed and sent to the milling unit (CEREC MC XL Premium; Dentsply Sirona). After cleaning and polishing of the templates, titanium sleeves were positioned into the drilling templates, as shown in Fig. 