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

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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

Australasian Orthodontic Journal

Volume 40 (2024): Issue 1 (January 2024)

By: Li Zhang, Beiwen Gong, Xianju Xie, Li Cao, Yingzhi Gu, Yaxi Sun and Yuxing Bai

Open Access

|Jul 2024

Figures & Tables

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.

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

DOI: https://doi.org/10.2478/aoj-2024-0015 | Journal eISSN: 2207-7480 | Journal ISSN: 2207-7472

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Language: English

Page range: 169 - 177

Submitted on: Dec 1, 2023

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Accepted on: May 1, 2024

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Published on: Jul 11, 2024

Published by: Australian Society of Orthodontists Inc.

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Related subjects:

Basic medical science,

Basic medical science, other

© 2024 Li Zhang, Beiwen Gong, Xianju Xie, Li Cao, Yingzhi Gu, Yaxi Sun, Yuxing Bai, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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