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Correction of Class II division 2 with crowding and bilateral fully transposed impacted mandibular canines

Lei Han
Lei Han
, 
Li Mei
Li Mei
, 
Caixia Zhang
Caixia Zhang
, 
Tuojiang Wu
Tuojiang Wu
, 
Congyue Wang
Congyue Wang
 und 
Huang Li
Huang Li
   | 17. Jan. 2022
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Online veröffentlicht: 17. Jan. 2022
Seitenbereich: 29 - 40
Eingereicht: 01. Dez. 2021
DOI: https://doi.org/10.21307/aoj-2022.004
© 2022 Lei Han et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Pretreatment facial and intraoral photographs.
Pretreatment facial and intraoral photographs.

Figure 2

Pretreatment dental casts.
Pretreatment dental casts.

Figure 3

Pretreatment radiographs. (A:44, B:42, C:83, D:43, E:41, F:31, G:33, H:32, I:34).
Pretreatment radiographs. (A:44, B:42, C:83, D:43, E:41, F:31, G:33, H:32, I:34).

Figure 4

Mandibular impacted canines were surgically exposed and bonded with buttons. The Quad-helix appliance was used for maxillary arch expansion; the reaction force when aligning the labially impacted canines assisted the mandibular expansion.
Mandibular impacted canines were surgically exposed and bonded with buttons. The Quad-helix appliance was used for maxillary arch expansion; the reaction force when aligning the labially impacted canines assisted the mandibular expansion.

Figure 5

A 0.016 × 0.022 inch stainless steel Ricketts utility arch was inserted into tubes of the mandibular molars to intrude the anterior teeth.
A 0.016 × 0.022 inch stainless steel Ricketts utility arch was inserted into tubes of the mandibular molars to intrude the anterior teeth.

Figure 6

The auxillary brackets and arch wires were added for torque control of the mandibular canines.
The auxillary brackets and arch wires were added for torque control of the mandibular canines.

Figure 7

Post-treatment facial and intraoral photographs.
Post-treatment facial and intraoral photographs.

Figure 8

The occlusion changes of mandibular arch during the treatment (A: before treatment, B: 6 months, C: 12 months, D: 15 months, E: 20 months, F: 24 months, G: 30 months, H: 40 months).
The occlusion changes of mandibular arch during the treatment (A: before treatment, B: 6 months, C: 12 months, D: 15 months, E: 20 months, F: 24 months, G: 30 months, H: 40 months).

Figure 9

Posttreatment dental casts.
Posttreatment dental casts.

Figure 10

The roots cross section view from the pre (A) and post (B) treatment CBCT (A:44, B:42, C:83, D:43, E:41, F:31, G:33, H:32, I:34).
The roots cross section view from the pre (A) and post (B) treatment CBCT (A:44, B:42, C:83, D:43, E:41, F:31, G:33, H:32, I:34).

Figure 11

Post-treatment radiographs and cephalometric superimposition (black lines: before treatment; red lines: after treatment).
Post-treatment radiographs and cephalometric superimposition (black lines: before treatment; red lines: after treatment).

Figure 12

Facial and intraoral photographs 2 years after treatment.
Facial and intraoral photographs 2 years after treatment.

Cephalometric analyses before and after treatment.

Measurement Chinese norm Before treatment After treatment
SNA (°) 82.3 ± 3.5 79.9 79.0
SNB (°) 78.9 ± 3.5 76.0 77.0
ANB (°) 3.4 ± 1.8 3.9 2.9
Wits (mm) 1.0 ± 1.3 −1.0 0.6
SN-MP (°) 32.8 ± 4.2 30.8 30.9
Y-axis (°) 64.7 ± 3.3 69.7 69.6
FMA (°) 31.3 ± 5.0 24.7 24.1
ANS-Me (mm) 56.8 ± 3.4 52.3 54.0
S-Go (mm) 68.8 ± 5.7 70.6 75.4
ANS-Me/N-Me(%) 53.3 ± 1.8 52.5 51.7
U1 to SN (°) 104.6 ± 6.0 80.7 106.4
U1 to NA (°) 24.7 ± 5.2 0.8 27.4
Ul to NA (mm) 6.2 ± 1.9 −3.1 6.3
Ll to NB (°) 31.0 ± 6.6 12.2 40.5
Ll to NB (mm) 7.8 ± 2.4 −2.1 6.8
Ll to MP (°) 96.3 ± 5.8 85.4 112.6
U1/L1(°) 120.3 ± 10.1 163.1 110.0
Upper lip (mm) 2.5 ± 1.5 −5.0 0.5
Lower lip (mm) 2.6 ± 1.5 −6.9 −0.5
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Sprache:
Englisch
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