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The insertion of the infrazygomatic crest mini-screw. (a) Customised guide plate for mini-screw insertion. (b) Nine groups with different combinations of the occlusogingival and mesiodistal angles. (c) The mini-screw was inserted until the beginning of the non-threaded part contacted the bone surface. MD mesial direction; DD distal direction; GD gingival direction; OD occlusal direction
