case_images: PMC10482525_01
case_images: Pretreatment facial and intraoral photographs and dental casts. (a) Frontal view. (b) Smile. (c) Lateral view. (d) Right molar relationship. (e) Centric occlusion. (f) Left molar relationship. (g) Mirror view (maxillary). (h) Mirror view (mandibular). (i) Pretreatment dental casts.
case_images: CRID2023-8836409.001.jpg
case_images: PMC10482525_01_CRID2023-8836409.001.jpg
case_images: fig1
case_images: Under extraoral examination (Figures 1(a), 1(b), and 1(c)), the patient exhibited a convex facial profile along with a reduced nasolabial angle. Intraoral examination (Figures 1(d), 1(e), 1(f), 1(g), 1(h), and 1(i)) demonstrated Class I molar relationship and Class II canine relationship on both sides, with an overjet of 5.9 mm and an overbite of 4.0 mm.
case_images: Pretreatment radiographs. (a) Panoramic radiograph sectioned from CBCT. (b-d) Three-dimensional reconstruction of CBCT. (e) The mandibular right first molar exhibited obvious radiolucency in the furcation and apical region, with root resorption. (f) The maxillary left second premolar exhibited a radiolucency in the distal regions of the crown. (g) Lateral cephalogram. (h) Lateral cephalometric tracing.
case_images: CRID2023-8836409.002.jpg
case_images: PMC10482525_01_CRID2023-8836409.002.jpg
case_images: fig2
case_images: In the initial cone-beam computed tomography (CBCT; Figures 2(a), 2(b), 2(c), 2(d), 2(e), and 2(f)), horizontal and vertical resorptions of the alveolar bone was visible.
case_images: Progress intraoral photographs. (a-e) Aligner stage 62, after 22 months of treatment. (f-j). Stage 15 of the second refinement, after 35 months of treatment.
case_images: CRID2023-8836409.003.jpg
case_images: PMC10482525_01_CRID2023-8836409.003.jpg
case_images: fig3
case_images: At stage 62 (Figures 3(a), 3(b), 3(c), 3(d), and 3(e)), all teeth had been aligned, with all the spaces completely closed. The third refinement was done with 10 stages of aligners, with the objective of final detailing of the occlusion (Figures 3(f), 3(g), 3(h), 3(i), and 3(j)).
case_images: Posttreatment facial and intraoral photographs and dental casts. (a) Frontal view. (b) Smile. (c) Lateral view. (d) Right molar relationship. (e) Centric occlusion. (f) Left molar relationship. (g) Mirror view (maxillary). (h) Mirror view (mandibular). (i) Posttreatment dental casts.
case_images: CRID2023-8836409.004.jpg
case_images: PMC10482525_01_CRID2023-8836409.004.jpg
case_images: fig4
case_images: Table 1) demonstrated all the treatment objectives were accomplished. The intraoral photographs and dental casts (Figures 4(d), 4(e), 4(f), 4(g), 4(h), and 4(i))indicated satisfactory dental alignment, the harmonious relationship of dental arch widths, and symmetric arches, and the excessive overjet and overbite had been relieved. The facial photographs (Figures 4(a), 4(b), and 4(c)) revealed a more harmonious and balanced soft-tissue profile, with favorable incisor exposure during a smile, and the dentition midlines were aligned to the facial midline.
case_images: Posttreatment radiographs. (a) Panoramic radiograph sectioned from CBCT. (b-d) Three-dimensional reconstruction of CBCT. (e) Lateral cephalogram. (f) Lateral cephalometric tracing.
case_images: CRID2023-8836409.005.jpg
case_images: PMC10482525_01_CRID2023-8836409.005.jpg
case_images: fig5
case_images: The posttreatment CBCT (Figures 5(a), 5(b), 5(c), and 5(d))demonstrated appropriate root parallelism and satisfactory space, with no substantial marginal bone loss or root resorption. The retraction and proper incisor position (Figures 5(b), 5(c), and 5(d)) contributed to an improved lip posture accordingly. The mandibular plane angle was maintained after the orthodontic treatment.
case_images: Superimpositions of the pretreatment (red) and posttreatment (blue) cephalometric tracings (on the S-N plane at the S point).
case_images: CRID2023-8836409.006.jpg
case_images: PMC10482525_01_CRID2023-8836409.006.jpg
case_images: fig6
case_images: Table 1) and superimposition (Figure 6) revealed that the protrusive incisors had been considerably retracted.