“…To overcome these problems, an image-fusion technique, [21][22][23] in which a virtual skull model obtained from CT scanning and a virtual dental model obtained from laser scanning of a dental cast or CT scanning of an impression, was introduced into threedimensional (3D) reconstruction methods to diagnose skeletal deformities. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][18][19][20] In addition to the above-mentioned disadvantages of CT scanning, another significant problem is streak artefacts caused by strongly attenuating objects, i.e., metal artefacts. [24][25][26] The presence of metal restorations, prostheses, dental implants, and orthodontic appliances in the field of view of the CT scan causes the metal artefacts, which may drastically degrade the CT images and limit the application of CT. 2,3,13,[24][25][26] This problem cannot be resolved entirely, even using the imagefusion technique, if the multiple and extensive artefacts extend into the fiducial markers used for image integration, thereby disturbing precise image fusion.…”