Figure 1. Three-dimensional (3D) digital model of the maxillary dentition. A, The 3D coordinate system for evaluating tooth movement; B, reference area (red) for superimposition; C, reference points on the maxillary incisor; D, maxillary canine; and E, maxillary first molar. Point O, The point where the palatine raphe meets the incisive papilla; Point 1, the mesio-gingival point of the bracket or tube base; Point 2, the mesio-occlusal point of the bracket or tube base; Point 3, the disto-occlusal point of the bracket or tube base; Point 4, the midpoint of the Point 1 and Point 3.
