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Samples of the maxillary arch images showing the variety of malocclusions, including pretreatment (A,B), during treatment (C–E), and post-treatment (F) images. To retain the aspect ratio of the original images, a black border was added to avoid side stretching to match the 480 × 320 size (A,F). The background change in the image did not affect the results. A sample of the selected rugae area is shown in (C).
