The effectiveness of Hawley and vacuum-formed retainer usage protocols on the stability of fixed orthodontic treatment results

Hande Gorucu-Coskuner; Ezgi Atik; Tülin Taner

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The effectiveness of Hawley and vacuum-formed retainer usage protocols on the stability of fixed orthodontic treatment results

Hande Gorucu-Coskuner

Ezgi Atik

Tülin Taner

| 13 jul 2021

Australasian Orthodontic Journal

Volumen 37 (2021): Edición 1 (January 2021)

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Article Category: research-article

Publicado en línea: 13 jul 2021

Páginas: 69 - 78

DOI: https://doi.org/10.21307/aoj-2021-007

© 2021 Hande Gorucu-Coskuner et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Comparisons of gender and age at debonding, molar relationships and ANB° before orthodontic treatment, and changes in arch dimensions with active orthodontic treatment between the groups.

		Group 1	Group 2	Group 3	Group 4	p-value
		N (%), median (min, max) or mean ± SD)	N (%), median (min, max) or mean ± SD)	N (%), median (min, max) or mean ± SD)	N (%), median (min, max) or mean ± SD)	p-value
Gender	Female	12 (100%)	5 (41.7%)	11 (84.6%)	10 (66.7%)	0.009^*,a
Gender	Male	0 (0%)	7 (58.3%)	2 (15.4%)	5 (33.3%)	0.009^*,a
Molar relationship	Class I	9 (75%)	9 (75%)	8 (61.5%)	7 (46.7%)	0.198^a
	End-to-end	3 (25%)	2 (16.7%)	3 (23.1%)	8 (53.3%)
	Class II	0 (0%)	1 (8.3%)	2 (15.4%)	0 (0%)
Age (years)		16.15 (14.1, 19.9)	16.1 (14.1, 18)	17 (15.3, 19.1)	17.25 (14, 23)	0.162^b
ANB°		3.15° (0.7°, 4.2°)	4.9° (1.6, 5.7)	3.8 (1, 5.1)	3 (0.9, 7)	0.113^b
Little (mm) (T1-T0)	Maxilla	-7.86 (-14.98,-4.62)	-8.97 (-14.6,-2.9)	-8.05 (-13.14,-3.09)	-8.21 (-16.8, -6.13)	0.885^b
Little (mm) (T1-T0)	Mandible	-6.58±2.43	-6.81±3.08	-8.25±3.40	-7.40±3.08	0.521^c
Intercanine width (mm) (T1-T0)	Maxilla	0.52 (-4.13, 5.33)	0.51 (-4.42,6.98)	1.54 (-1.75, 2.74)	0.78 (-2.45, 4.27)	0.957^b
Intercanine width (mm) (T1-T0)	Mandible	0.44±1.20	1.07±1.67	1.11±1.66	0.97±1.21	0.640^c
Intermolar width (mm) (T1-T0)	Maxilla	0.18 (-2.73, 4.6)	1.73 (-1.5, 4.6)	0.99 (-0.71, 6.32)	0.12 (-1.01, 5.4)	0.175^b
Intermolar width (mm) (T1-T0)	Mandible	-0.01±1.60	1.96±1.65	0.24±1.83	1.32±2.44	0.051^c
Arch length (mm) (T1-T0)	Maxilla	2.08±2.10	1.90±2.65	2.12±3.16	2.31±2.96	0.986^c
Arch length (mm) (T1-T0)	Mandible	2.64±1.89	2.81±4.71	2.14±3.64	3.61±3.26	0.732^c
Overjet (mm) (T1-T0)		-0.73±1.24	-0.63±1.24	-0.27±1.35	-1.03±1.12	0.456^c
Overbite (mm) (T1-T0)		-0.66±1.13	-1.53±1.27	-1.00±1.38	-1.29±1.27	0.372^c

Intragroup and intergroup arch measurement changes occurred from debonding (T1) to 12th month (T3), and from sixth (T2) to 12th month (T3 of retention, and their significances.

		Maxilla				Mandible				Inter-arch
		Little (mm) (mean±SD)	Intercanine width (mm) (mean±SD)	Intermolar width (mm) (mean±SD)	Arch length (mm) (mean±SD)	Little (mm) (mean±SD)	Intercanine width (mm) (mean±SD)	Intermolar width (mm) (mean±SD)	Arch Length (mm) (mean±SD)	Overjet (mm) (mean±SD)	Overbite (mm) (mean±SD)
Group 1 (N=12)	T3-T2	0.30±0.27	0.03±0.30	0.01±0.18	0.03±0.43	0.31±0.45	-0.05±0.20	0.04±0.11	0.17±0.84	-0.18±0.49	0.02±0.41
	P	0.172^a	1.000^a	1.000^a	1.000^a	0.212^a	1.000^a	1.000^a	1.000^a	0.482^a	1.000^a
	T3-T1	1.02±0.84	0.91±0.64	0.71±0.61	0.15±0.69	1.10±0.92	-0.14±0.51	0.45±0.58	-0.18±0.95	0.08±0.63	0.35±0.47
	P	<0.001^****,a	1.000^a	0.001^***,a	1.000^a	<0.001^****,a	1.000^a	0.347^a	1.000^a	1.000^a	0.121^a
Group 2 (N=12)	T3-T2	0.41±0.43	-0.38±0.58	0.03±0.46	-0.12±0.5	0.80±0.58	-0.08±0.31	0.08±0.40	-0.25±0.62	-0.10±0.42	0.14±0.39
	P	0.028^*,a	0.178^a	1.000^a	1.000^a	<0.001^****,a	1.000^a	1.000^a	0.890^a	1.000^a	0.884^a
	T3-T1	0.81±0.76	-0.17±0.84	0.25±0.73	-0.11±1.05	1.17±0.79	-0.11±0.61	0.09±0.79	-0.30±0.82	-0.36±0.90	0.23±0.58
	P	0.001^***,a	1.000^a	0.569^a	1.000^a	<0.001^****,a	1.000^a	1.000^a	1.000^a	0.213^a	0.557^a
Group 3 (N=13)	T3-T2	0.23±0.66	0.39±0.94	0.51±1.00	0.44±0.88	0.27±0.37	-0.17±0.59	0.46±0.95	0.11±0.95	-0.30±0.54	-0.24±0.50
	P	0.371^a	0.134^a	0.010^**,a	0.024^*,a	0.287^a	0.409^a	0.027^*,a	1.000^a	0.048^*,a	0.172^a
	T3-T1	0.62±0.55	0.21±0.60	0.36±0.71	0.44±1.69	0.91±0.66	0.19±0.76	0.82±1.42	0.60±2.45	-0.32±0.53	0.15±0.60
	P	0.010^**,a	0.919^a	0.165	0.579	0.001^***,a	0.805^a	0.011^*,a	0.519^a	0.289	1.000^a
Group 4 (N=15)	T3-T2	0.34±0.62	0.36±0.71	0.14±0.42	0.00±0.37	0.59±0.77	0.06±0.42	0.34±0.62	-0.05±0.83	0.12±0.29	-0.04±0.45
	P	0.048*^,a	1.000^a	1.000^a	1.000^a	0.001^***,a	1.000^a	0.120^a	1.000^a	0.936^a	1.000^a
	T3-T1	0.76±0.73	-0.03±0.80	0.18±0.55	0.20±1.09	1.10±0.91	0.07±0.50	0.25±0.86	-0.25±1.38	0.19±0.59	0.22±0.64
	P	0.001^***,a	1.000^a	0.890^a	1.000^a	<0.001^****,a	1.000^a	0.945^a	1.000^a	0.852^a	0.453^a
Intergroup comparison (p-value)	T3-T2	0.897^b	0.016^,b (2-3; p=0.008^*)	0.286^b	0.306^d	0.119^b	0.651^b	0.298^b	0.494^b	0.092^c	0.206^c
	T3-T1	0.604^c	0.599^c	0.196^c	0.399^b	0.875^c	0.481^c	0.575^b	0.727^b	0.076^b	0.527^b

Arch measurements at debonding (T1), after six month full-time retention (T2), measurement changes from T1 to T2, comparisons of the changes between Hawley and vacuum-formed retainer groups.

		HAWLEY (N=26)			P	VACUUM-FORMED RETAINER (N=32)			P	Intergroup comparisonP
		T1 Mean ± SD or median (min, max)	T2 Mean ± SD or median (min, max)	T2-T1 Mean ± SD or median (min, max)	P	T1 Mean ± SD or median (min, max)	T2 Mean ± SD or median (min, max)	T2-T1 Mean ± SD or median (min, max)	P
Maxilla	Little (mm)	0 (0,0)	0.44 (0, 2.08)	0.44 (0, 2.08)	<0.001^****,a	0 (0,0)	0.05 (0, 2.3)	0.05 (0, 2.3)	<0.001^****,a	0.225^c
	Intercanine width (mm)	36±2.17	36.16±2.14	0.17±0.72	0.253^b	35.07 (31.9, 38.08)	34.94 (31.56, 38.86)	0 (-2.78, 0.78)	0.414^a	0.081^c
	Intermolar width (mm)	51.29 (43.69, 59.20)	51.83 (45.10, 59.28)	0.32 (-0.57, 1.82)	<0.001^****,a	51.12 (45.75, 58.06)	51.31 (44.82, 58.06)	0 (-1.65, 1.25)	0.679^a	<0.001^****,c
	Arch Length (mm)	71.83±4.00	71.91±3.96	0.77±0.90	0.663^b	70.00 (62.76, 78.30)	70.18 (62.8, 77.8)	0.01 (-1.8, 3.26)	0.940^a	0.969^c
Mandible	Little (mm)	0 (0,0)	0.46 (0, 2.64)	0.46 (0, 2.64)	<0.001^****,a	0 (0, 1.36)	0.39 (0, 1.79)	0.37 (0, 1.61)	<0.001^****,a	0.703^c
	Intercanine width (mm)	27.53±1.76	27.52±1.72	-0.02±0.52	0.884^b	26.85±1.41	27.02±1.42	0.16±0.43	0.039^*,b	0.156^d
	Intermolar width (mm)	44.64±2.69	44.88±2.62	0.24±0.61	0.057^b	44.76 (38.45, 52.05)	44.62 (38.88, 52.05)	0.04 (-1.11, 1.90)	0.204^a	0.334^c
	Arch Length (mm)	61.93±3.61	61.70±3.83	-0.23±0.90	0.204^b	61.29 (52.88, 66.74)	60.77 (52.88, 66.17)	0.10 (-1.74, 5.79)	0.926^a	0.260^c
Inter-arch	Overjet (mm)	2.27±0.88	2.30±0.73	0.04±0.63	0.776^b	2.16±0.72	2.18±0.72	0.02±0.48	0.825^b	0.910^d
	Overbite (mm)	2.36±0.73	2.59±0.76	0.23±0.56	0.047^*,b	2.48±0.71	2.79±0.65	0.31±0.49	0.001^***,b	0.571^d

eISSN:: 2207-7480
Idioma:: Inglés

Calendario de la edición:: Volume Open
Temas de la revista:: Medicine, Basic Medical Science, other

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