Fig. 4From: MicroCT X-ray comparison of aligner gap and thickness of six brands of aligners: an in-vitro studyIdentification of 2D points on construction grid for incisor (a), canine (b) and first molar (c). Eight points were identified: 1, palatal gingival; 2, midway point between 1 and 3; 3, incisal edge; 4, midway point between 3 and 5; 5, vestibular gingival; 6, vestibular cusp; 7, palatal cusp; and 8, fossaBack to article page