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The effectiveness of clear aligners in levelling the curve of Spee and related maxillofacial factors in patients with a deep overbite

Li Zhang
Li Zhang
, 
Beiwen Gong
Beiwen Gong
, 
Xianju Xie
Xianju Xie
, 
Li Cao
Li Cao
, 
Yingzhi Gu
Yingzhi Gu
, 
Yaxi Sun
Yaxi Sun
 y 
Yuxing Bai
Yuxing Bai
   | 11 jul 2024
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Publicado en línea: 11 jul 2024
Páginas: 169 - 177
Recibido: 01 dic 2023
Aceptado: 01 may 2024
DOI: https://doi.org/10.2478/aoj-2024-0015
© 2024 Li Zhang et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Measurements made using the digital dental model. (A) Depth of COS. The occlusal plane is established in the mandibular dental arch, followed by measurement of the perpendicular distances from the occlusal plane to the buccal cusp tip of each lateral tooth. (B) Crowding analysis. Left, the sum of the tooth widths of the mandible: proximal and distal width of each tooth (T1). Right, the total recorded arch perimeter: the length of the mandibular dental arch (T1). COS, curve of Spee.
Measurements made using the digital dental model. (A) Depth of COS. The occlusal plane is established in the mandibular dental arch, followed by measurement of the perpendicular distances from the occlusal plane to the buccal cusp tip of each lateral tooth. (B) Crowding analysis. Left, the sum of the tooth widths of the mandible: proximal and distal width of each tooth (T1). Right, the total recorded arch perimeter: the length of the mandibular dental arch (T1). COS, curve of Spee.

Figure 2.

Details of the cephalometric and panoramic radiograph measurements. (A) Measurements made using the lateral cephalogram. (B) Measurement of incisor parallelism.
Details of the cephalometric and panoramic radiograph measurements. (A) Measurements made using the lateral cephalogram. (B) Measurement of incisor parallelism.

Description of cephalometric description

Cephalometric measurement Description
MP-FH (°) The angle between Frankfort horizontal plane (Or, Po) and mandibular plane (Me, Go)
RP-MP (°) The angle between ramal plane (Ar, Go) and mandibular plane (Me, Go)
IMPA (°) The angle between mandibular incisors (LIA, LI) and mandibular plane (Me, Go)
Posterior/anterior face height (P/A) (%) The ratio between posterior face height (S-Go) and anterior face height (N-Me)
Panoramic radiograph measurement
Incisors’ parallelism (%) The ratio of length between the midpoint of lateral incisor edges and the length between the lateral incisor root tips

Stepwise multiple regression analysis for the leveling efficiency

Dependent variable Statistically significantindependent variables B SEM B P-value T R2 change
E MP-FH (T1) 0.008 0.302 0.050* 1.975 0.025
D (T1) 0.120 0.425 0.006** 2.923 0.531
P (T1) -0.254 -0.373 0.011* -2.668 0.280
IMPA (T1) 0.005 0.623 0.007** 2.923 0.049

The intraclass correlation coefficient

95% confidence interval
Intraclass correlation Lower bound Upper bound
COS depth (T1) 0.871 0.796 0.923
COS depth (T2) 0.801 0.668 0.886
COS depth (T3) 0.864 0.786 0.920
MP-FH (T1) 0.977 0.962 0.987
PP-MP (T1) 0.950 0.917 0.972
RP-MP (T1) 0.979 0.965 0.988
IMPA (T1) 0.938 0.900 0.964
P/A (T1) 0.953 0.921 0.973
C (T1) 0.940 0.902 0.965
P (T1) 0.915 0.863 0.950

Summary statistics for the variables (n =42)

Mean SEM SD
MP-FH (°) 28.123 0.949 6.153
RP-MP (°) 121.764 0.830 5.382
IMPA (°) 93.219 1.098 7.117
P/A (%) 0.634 0.009 0.059
Crowding(mm) 1.248 0.295 1.911
D(T1) (mm) 2.513 0.101 0.656
D(T2) (mm) 1.643 0.066 0.432
D(T3) (mm) 1.279 0.070 0.456
P (%) 1.057 0.040 0.259
Achieved leveling value 0.901 0.070 0.455
Predicted leveling value 1.251 0.084 0.542
eISSN:
2207-7480
Idioma:
Inglés
Calendario de la edición:
Volume Open
Temas de la revista:
Medicine, Basic Medical Science, other
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