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Figure 1 | Progress in Orthodontics

Figure 1

From: Analysis of pain level in cases treated with Invisalign aligner: comparison with fixed edgewise appliance therapy

Figure 1

Three categories of reasons for pain or discomfort. Category 1 indicates trays with some materials missing (arrow in (A)) or non-smooth edges (arrow in (B)). Category 2 indicates deformation of the attachments at the occlusal margin (arrows in (C)) and at the gingival margin (arrow in (D)). Category 3 indicates deformation of the tray in vertical dimension (E) and in transverse dimension (F).

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