The applicability of the Tanaka and Johnston analysis in a contemporary Western Australian population Cover

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The applicability of the Tanaka and Johnston analysis in a contemporary Western Australian population

Australasian Orthodontic Journal

Volume 38 (2022): Issue 1 (January 2022)

By: Sidra Abaid, Sobia Zafar, Estie Kruger and Marc Tennant

Open Access

|Jul 2022

Figures & Tables

Invisalign technology displaying upper and lower arch with Mesiodistal dimensions of permanent teeth (300dpi).

Regression parameters for the estimation of mesiodistal dimensions of canine and premolar in each arch for the Australian adolescent population_

Variable (Y)	X	Gender	a	P-value	b	P-value	Adj.R ²	SEE	r
Max-CPM	Mandibular Incisors	M	5.09	<0.001	0.725	<0.001	0.543	0.88	0.739
Man-CPM	Mandibular Incisors	M	6.34	<0.001	0.658	<0.001	0.471	0.92	0.688
Max-CPM	Mandibular Incisors	F	7.44	<0.001	0.620	<0.001	0.337	1.04	0.582
Man-CPM	Mandibular Incisors	F	5.59	<0.001	0.635	<0.001	0.386	0.96	0.623

Comparison of actual and predicted mesiodistal dimensions of canine and premolars using Tanaka and Johnston equation using paired t test_

			Actual value			Predicted value
Gender	Group variables	N	Mean	SD	SEM	Mean	SD	S.E.M	P-value
M	Max-CPM	177	22.17	1.30	0.10	22.79	0.66	0.05	<0.001*
	Max-CPM	177	21.84	1.27	0.10	22.29	0.66	0.05	<0.001*
F	Max-CPM	177	21.84	1.28	0.07	22.62	0.60	0.03	<0.001*
	Max-CPM	177	21.33	1.22	0.07	22.12	0.60	0.03	<0.001*

New regression equations for the estimation of mesiodistal dimensions of canine and premolar derived for both males and females of the Australian population_

Arch (Y)	Gender	Equation	r	P-value
Max-CPM	M	5.09 + 0.725 (X)	0.739	<0.001
	F	7.44 + 0.620 (X)	0.582	<0.001
Man-CPM	M	6.34 + 0.658 (X)	0.688	<0.001
	F	5.59 + 0.635 (X)	0.623	<0.001

Comparison of regression parameters between the present study and other studies_

				Constants
Author & Year	Population	Gender	Canine-premolar segment	r	a	B	SEE	R ²
Tanaka and Johnston⁶	White American	M + F	Y₁	0.63	10.41	0.51	0.86	0.40
			Y₂	0.65	9.18	0.54	0.85	0.42
Frankel and Benz²¹	African American	M	Y₁	0.72	9.15	0.58	0.923	–
			Y₂	0.79	5.97	0.72	0.911	–
		F	Y₁	0.61	12.83	0.39	0.672	–
			Y₂	0.66	10.34	0.49	0.709	–
Yuen et al.⁴¹	Hongkong Chinese	M	Y₁	0.79	7.97	0.66	0.68	0.62
			Y₂	0.77	8.82	0.58	0.61	0.60
		F	Y₁	0.65	8.30	0.61	0.81	0.42
			Y₂	0.69	6.66	0.64	0.82	0.47
Jaroontham and Godfrey¹⁹	Thai	M	Y₁	0.54	13.36	0.41	0.88	0.29
			Y₂	0.58	11.92	0.43	0.85	0.34
		F	Y₁	0.62	11.16	0.49	0.78	0.39
			Y₂	0.65	9.49	0.53	0.78	0.42
Al-Bitar et al.¹⁶	Jordan	M	Y₁	0.57	11.80	0.43	0.88	0.33
			Y₂	0.65	9.32	0.53	0.87	0.42
		F	Y₁	0.61	11.25	0.44	0.75	0.38
			Y₂	0.68	9.22	0.50	0.72	0.47
Arslan et al.³	Turkey	M	Y₁	0.79	9.98	0.50	0.72	0.62
			Y₂	0.74	9.54	0.50	0.78	0.54
		F	Y₁	0.83	9.77	0.50	0.72	0.68
			Y₂	0.69	9.14	0.50	0.81	0.47
Pardede et al.³⁵	Indonesia	M	Y₁	0.67	10.51	0.54	0.87	0.45
			Y₂	0.71	8.03	0.60	0.88	0.50
		F	Y₁	0.57	11.63	0.47	0.93	0.32
			Y₂	0.61	11.16	0.45	0.81	0.36
Present study	Western Australian	M	Y₁	0.74	5.09	0.72	0.88	0.54
			Y₂	0.69	6.34	0.66	0.92	0.47
		F	Y₁	0.58	7.44	0.62	1.04	0.34
			Y₂	0.62	5.59	0.63	0.96	0.39

A prediction model for the estimation of mesiodistal dimensions of canines and premolars for Australian population adolescents_

	Male		Female
Mandibular Incisors	Max-CPM (Y₁)	Man-CPM (Y₂)	Max-CPM (Y₁)	Man-CPM (Y₂)
19.0	18.87	18.84	19.22	17.66
19.5	19.23	19.17	19.53	17.97
20.0	19.59	19.50	19.84	18.29
20.5	19.95	19.83	20.15	18.61
21.0	20.32	20.16	20.46	18.93
21.5	20.68	20.49	20.77	19.24
22.0	21.04	20.82	21.08	19.56
22.5	21.40	21.15	21.39	19.88
23.0	21.77	21.47	21.70	20.20
23.5	22.13	21.80	22.01	20.51
24.0	22.49	22.13	22.32	20.83
24.5	22.85	22.46	22.63	21.15
25.0	23.22	22.79	22.94	21.47
25.5	23.58	23.12	23.25	21.78
26.0	23.94	23.45	23.56	22.10
26.5	24.30	23.78	23.87	22.42
27.0	24.67	24.11	24.18	22.74
27.5	25.03	24.44	24.49	23.05
28.0	25.39	24.76	24.80	23.37
28.5	25.75	25.09	25.11	23.69
29.0	26.12	25.42	25.42	24.01

Comparison of mean study parameters of group of teeth in each gender using independent sample t test_

Dental Variables	Gender	N	Mean	SD	SEM	Mean Diff	t	P-value
Mandibular Incisors (mm)	M	177	23.57	1.33	0.10	0.344	2.95	0.003*
	F	323	23.23	1.20	0.07
Max-CPM (mm)	M	177	22.17	1.30	0.10	0.334	2.76	0.006
	F	323	21.84	1.28	0.07
Mand-CPM (mm)	M	177	21.84	1.27	0.10	0.504	4.36	<0.001*
	F	323	21.33	1.22	0.07

DOI: https://doi.org/10.2478/aoj-2022-0018 | Journal eISSN: 2207-7480 | Journal ISSN: 2207-7472

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Language: English

Page range: 153 - 161

Submitted on: Feb 1, 2022

Accepted on: Apr 1, 2022

Published on: Jul 6, 2022

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

© 2022 Sidra Abaid, Sobia Zafar, Estie Kruger, Marc Tennant, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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