Figure 2. Scanning sequences and reference faces for model division and the model sections. A, The Group Right sequence on the iTero®. The right molars were scanned first in the order of the occlusal side ①, buccal side ②, and palatal side ③; subsequently, the left molars were scanned in the same fashion in the order of ④, ⑤, and ⑥. Both scanned images were merged and connected at the anterior area. The scanning sequence for Group Left first scanned the left molars in reverse. B, The sequence for Group Right on the Trios®. Scanning started from the occlusal side of the right molars and proceeded toward the left occlusal side ①, continued along the buccal side in the reverse direction ②, and lastly, from the palatal side of the right molars, proceeding toward the palatal side of the left molars ③. The scanning sequence for Group Left first scanned the left side in reverse. C, The reference faces for model division and the model sections. Face 1 is a plane passing through the posterior fiducials on both sides, Face 2 is a plane passing through the anterior ball marker and perpendicular to Face 1, and Faces 3 and 4 are planes passing the fiducials in the canine region and the intersection point of Faces 1 and 2.
The scanned images were divided into 6 sections: RM, right molar; RP, right premolar; RA, right anterior; LM, left molar; LP, left premolar; LA, left anterior.