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Compare aligner thicknesses (bottom view). A, Group 1 (equi-margin) and Group 4 (equi-margin with reduced buccolingual width); B, Group 1 (equi-margin) and Group 3 (equi-margin with 1-mm thickness and height); C, Group 1 (equi-margin) and 3 (equi-margin with 1-mm thickness and height), and Group 4 (equi-margin with reduced buccolingual width). Grey: Group 1, Red: Group 3, Green: Group 4.
