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Treatment of an anterior open bite, bimaxillary protrusion and mesiocclusion by the extraction of premolars and the use of clear aligners

Xiaosong Xiang

Xiaosong Xiang

  • Department of orthodontics, Tianjin Stomatological HospitalTianjin, China
  • School of Medicine, Nankai UniversityTianjin, China
  • Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin, China
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Xiang, Xiaosong
, 
Chunlin Wang

Chunlin Wang

Department of Orthodontics, Stomatological Hospital, School of Stomatology, Southern Medical UniversityGuangzhou, Guangdong, China
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Wang, Chunlin
, 
Xiaohang Guan

Xiaohang Guan

  • Department of orthodontics, Tianjin Stomatological HospitalTianjin, China
  • School of Medicine, Nankai UniversityTianjin, China
  • Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin, China
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Guan, Xiaohang
, 
Lu Wang

Lu Wang

  • Department of orthodontics, Tianjin Stomatological HospitalTianjin, China
  • School of Medicine, Nankai UniversityTianjin, China
  • Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin, China
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Wang, Lu
 e 
Song Cang

Song Cang

  • Department of orthodontics, Tianjin Stomatological HospitalTianjin, China
  • School of Medicine, Nankai UniversityTianjin, China
  • Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin, China
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Cang, Song
  
08 mar 2023
Treatment of an anterior open bite, bimaxillary protrusion and mesiocclusion by the extraction of premolars and the use of clear aligners's Cover Image
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Pubblicato online: 08 mar 2023
Pagine: 72 - 85
Ricevuto: 01 ott 2022
Accettato: 01 gen 2023
DOI: https://doi.org/10.2478/aoj-2023-0007
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© 2023 Xiaosong Xiang et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Pre-treatment extraoral and intraoral photographs.
Pre-treatment extraoral and intraoral photographs.

Figure 2.

Initial study models.
Initial study models.

Figure 3.

The pre-treatment labial and lingual bone volume of anterior teeth (A) and temporomandibular joint radiograph (B).
The pre-treatment labial and lingual bone volume of anterior teeth (A) and temporomandibular joint radiograph (B).

Figure 4.

Pre-treatment panoramic radiograph (A) and lateral cephalometric radiograph (B).
Pre-treatment panoramic radiograph (A) and lateral cephalometric radiograph (B).

Figure 5.

Pre-treatment ClinCheck treatment plan (Align Technology, Santa Clara, CA, USA).
Pre-treatment ClinCheck treatment plan (Align Technology, Santa Clara, CA, USA).

Figure 6.

Refinement stage: ClinCheck treatment plan (Align Technology, Santa Clara, CA, USA).
Refinement stage: ClinCheck treatment plan (Align Technology, Santa Clara, CA, USA).

Figure 7.

Post-treatment extraoral and intraoral photographs.
Post-treatment extraoral and intraoral photographs.

Figure 8.

Final study models.
Final study models.

Figure 9.

Two-dimensional (2D) superimposed cephalometric tracings.
Two-dimensional (2D) superimposed cephalometric tracings.

Figure 10.

Three-dimensional (3D) superimpositions (pre-treatment and post-treatment). (A) the anterior teeth; (B–D) the posterior teeth.
Three-dimensional (3D) superimpositions (pre-treatment and post-treatment). (A) the anterior teeth; (B–D) the posterior teeth.

Figure 11.

Post-treatment panoramic radiograph (A) and lateral cephalometric radiograph (B).
Post-treatment panoramic radiograph (A) and lateral cephalometric radiograph (B).

Figure 12.

The post-treatment labial and lingual bone volume of anterior teeth (A) and temporomandibular joint radiograph (B).
The post-treatment labial and lingual bone volume of anterior teeth (A) and temporomandibular joint radiograph (B).

Figure 13.

The ‘pendulum effect’ of the retraction of the anterior teeth.
The ‘pendulum effect’ of the retraction of the anterior teeth.

Figure 14.

Counter-clockwise rotation of the mandible.
Counter-clockwise rotation of the mandible.

Figure 15.

The extrusive force and intrusive force generated by reciprocal anchorage.
The extrusive force and intrusive force generated by reciprocal anchorage.

Figure 16.

Overcorrection to keep the crowns inclined distally. (A-B) during treatment. (C-D) before treatment.
Overcorrection to keep the crowns inclined distally. (A-B) during treatment. (C-D) before treatment.

Pre-treatment and post-treatment cephalometric analysis_

Measurement Mean ± SD Pre-treatment Post-treatment
Sagittal skeletal relations
    S-N-A 82° ± 3.5° 76° 72°
    S-N-PG 80° ± 3.5° 73° 70°
    A-N-PG 2° ± 2.5° 3° 2°
Vertical skeletal relations
    S-N/ANS-PNS 8° ± 3.0° 6° 11°
    S-N/GO-GN 33° ± 2.5° 48° 48°
    ANS-PNS/GO-GN 25° ± 6.0° 32° 27°
Dento-basal relations
    UI/ANS-PNS 110° ± 6.0° 129° 118°
    LI/GO-GN 94° ± 7.0° 91° 82°
    LI/A-PG (mm) 2 ± 2.0 4.4 2.7
Dental relations
    Overjet (mm) 3.5 ± 2.5 2.2 2.6
    Overbite (mm) 2 ± 2.5 -2.8 1.2
    Interincisal angle UI/LI 132° ± 6.0° 108° 133°
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Inglese
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