PMC8754273_01
Case report 1: (A) Preoperative frontal view; (B) Preoperative maxillary occlusal view; (C) Preoperative mandibular occlusal view; (D) Quad Helix in situ; (E) Expanded maxillary arch after 7 months; (F) Postoperative frontal view
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F1
Figures 1A to C show the intraoral examination of retained 52, 62, 72 with palatally erupting 12, 22 and lingually erupting 32. 11, 21 were mesiopalatally and 42 was distolingually inclined with class I molar relation on both sides. Figure 1D. Fixed orthodontic treatment was initiated simultaneously. Figures 1E and F reveal posttreatment effect, after 7 months of quad helix activation and sequential changing of NiTi archwires 0.14'', 0.16'', and 0.18'' favorable esthetic result was achieved.
PMC8754273_02
Case report 2; (A) Preoperative frontal view with anterior crossbite; (B) Preoperative maxillary view with palatally erupting 12, 22; (C) Preoperative mandibular occlusal view; (D) Quad Helix in situ; (E) Expanded maxillary arch with aligned 12, 22; (F) Postoperative frontal view
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F2
Figure 2D represents the cementation of a fabricated quad helix on 16 and 26. After 6 months of activation of the quad helix and sequential changing of NiTi archwires 0.14'', 0.16'', and 0.18'' esthetic outcome was achieved which was revealed in Figures 2E and F.
PMC8754273_03
Case report 3; (A) Preoperative frontal view with 11, 22 in crossbite; (B) Preoperative maxillary occlusal view with palatally placed 22; (C) Preoperative mandibular occlusal view; (D) Quad Helix in situ; (E) Expanded maxillary arch with aligned 11, 22; (F) Postoperative frontal view
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F3
Dehiscence was not appreciated in the palatal region revealed (Fig. 3).