## 2 Case Report
### Treatment Results  
The posttreatment facial photographs and cephalograms showed an increased exposure of the anterior maxillary teeth when smiling with their extrusion and an acceptable facial profile and symmetry. Posttreatment intraoral photographs and dental casts showed a Class I canine and molar relationships with good occlusal interdigitation, maxillary and mandibular dental midline coincidence, and acceptable overjet and overbite. The posttreatment panoramic radiograph showed proper root parallelism. The CBCT axial image at the root apex level showed that the roots of the mandibular posterior teeth were in touch or penetrated into the lingual cortical bone by distalization of the mandibular posterior teeth (Figures 9-11).  
Figure 8: Retainers. **Top**, wraparound-type retainers; **Bottom**, tooth positioner.  
Figure 9: Posttreatment facial and intraoral photographs.  
Cephalometric superimpositions revealed that the anterior maxillary teeth were extruded with clockwise rotation of the maxillary occlusal plane, and the mandibular anterior and posterior teeth were extruded and uprighted with counterclockwise rotation of the mandibular occlusal plane. And the mandible rotated downward and backward with increasing anterior facial height (AFH) followed by improvement of the facial profile (Figure 12).  
Figure 11: Posttreatment radiographs.  
Figure 10: Posttreatment dental casts and CBCT axial image of the mandible.  
The ANB angle increased by 0.5\({}^{\circ}\) from \(-\)3.7\({}^{\circ}\) to \(-\)3.2\({}^{\circ}\), the Wits value increased by 3.2 mm from \(-\)9.8 mm to \(-\)6.6 mm, the mandibular plane angle (SN-MP) increased by 1.7\({}^{\circ}\) from 29.5\({}^{\circ}\) to 31.2\({}^{\circ}\), facial height ratio decreased by 1.1% from 70.5% to 69.4%, U1 to FH decreased by 1.1\({}^{\circ}\) from 127.6\({}^{\circ}\) to 126.5\({}^{\circ}\), IMPA decreased by 14.2\({}^{\circ}\) from 86.7\({}^{\circ}\) to 72.5\({}^{\circ}\), interincisal angle increased by 13.7\({}^{\circ}\) from 123.0\({}^{\circ}\) to 136.7\({}^{\circ}\), maxillary occlusal plane angle increased by 5.7\({}^{\circ}\) from \(-\)3.5\({}^{\circ}\) to 2.2\({}^{\circ}\), mandibular occlusal plane angle decreased by 8.7\({}^{\circ}\) from 7.8\({}^{\circ}\) to \(-\)0.9\({}^{\circ}\), UL-EL increased by 2.0 mm from \(-\)4.8 mm to \(-\)2.8 mm, LL-EL increased by 1.6 mm from \(-\)1.3 mm to 0.3 mm, nasolabial angle decreased by 6.8\({}^{\circ}\) from 99.5\({}^{\circ}\) to 92.7\({}^{\circ}\), and Z angle decreased by 2.6\({}^{\circ}\) from 85.7\({}^{\circ}\) to 83.1\({}^{\circ}\) (Table 1).  
Posttreatment CBCT images showed that U1 MP moved inferiorly by 3.2 mm from 78.1 mm to 81.3 mm and L1 MP moved superiorly by 5.3 mm from 85.2 mm to 79.9 mm. Mandibular dental deviation was reduced by 4.4 mm from 6.2 mm to 1.8 mm, but the maxillary dental midline showed little change. Chin deviation (menton) was reduced by 2.2 mm from 7.7 mm to 5.5 mm. The pogonion, menton, stomion, upper lip, and lower lip moved downward (Figure 13, Table 2). At 22 months into retention, the treatment results were well maintained except for a slight relapse in the mandibular dental midline, anterior teeth, and lips (Figures 14 and 15).