In computer-guided implant surgery, an accurate 3-dimensional (3D) image matching of the hard and soft tissues obtained by cone-beam computerized tomography (CBCT) and optical surface scanners is a prerequisite for prosthetic treatment planning, implant positioning, and surgical guide fabrication.1,2  Identical anatomic features that are clearly discernible in the optical and radiographic scan data are used as references to match the acquired images.3,4  Natural teeth are commonly selected as fiducial landmarks for image matching in partially edentulous cases. In completely edentulous cases, because of the absence of natural teeth, special techniques are required to match the optical and radiographic data.4,5 

The double scan protocol has been considered the most common method for image matching in completely edentulous cases.6,7  The early developed technique consists of 2 radiographic scans, one of the patient wearing the scan prosthesis and the...

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