Changing clear aligners every 10 days or 14 days ? A randomised controlled trial

Changing clear aligners every 10 days or 14 days ? A randomised controlled trial

Australasian Orthodontic Journal

Volume 39 (2023): Issue 1 (January 2023)

By:

Rui Zhao, Li Mei, Hu Long, Fan Jian and Wenli Lai

Open Access

|Jan 2023

Figures & Tables

CONSORT flow chart showing subjects flow during the trial.

Superimposition of the initial models and progress models based on the stable structure method (unmoved teeth in the ClinCheck) using the GEOMAGIC studio software. (a) Teeth designed not to be moved in ClinCheck were respectively separated from initial models and progress models (grey and purple coloured the second molars); (b) and (c) Registration of the unmoved teeth (second molars); (d) and (e) Final superimposition using the unmoved teeth (second molars) as reference.

Measurement of OTM. (a) Molar distalization was measured at points of each cusp tip of molars; (b) Points of incisor edges were used to measure anterior retraction; (c) Measurement of anterior intrusion; (d) Lines of incisor edges were used to measure angle of anterior rotation; (e) Measurement of posterior expansion. CIE: central incisal edge; DIE: distal incisal edge; DVC: distal vestibular cusp tip; MVC: mesial vestibular cusp tip; MIE: mesial incisal edge; PC: palatal cusp tip; VC: vestibular cusp tip.

Shell-to-shell deviation of OTM by using a whole surface best fit algorithm and colour-mapping methods in the GEOMAGIC studio software. Green represents no deviation; red represents a large and positive deviation; blue represents a small and negative deviation. The bigger the deviation is the more OTM stray from the ClinCheck.

Shell-to-shell deviation of OTM (mean ± standard error) at Stage 8 (T1) and Stage 16 (T2) of the Invisalign treatment. There was no statistically significant difference between the 10-day group and 14-day group.

Pain perception (VAS score, mean ± standard error) of the 10-day and 14-day groups was similar throughout the study.

Comparison of orthodontic tooth movement (OTM) efficacy between 10-day and 14-day groups at stage 8 (T1) of the Invisalign treatment_

	10-day group					14-day group
OTM	N	PredictedOTM	Actual OTM	Mean OTMefficacy	SD	N	PredictedOTM	Actual OTM	Mean OTMefficacy	SD	P-value
Anterior intrusion	76	1.78 mm	1.34 mm	75.15%	13.20%	81	1.72 mm	1.26 mm	73.42%	13.92%	0.43
Anterior extrusion	17	1.69 mm	1.29 mm	76.63%	9.29%	14	1.78 mm	1.45 mm	81.26%	10.14%	0.19
Anterior proclination	69	7.44°	6.17°	82.90%	9.84%	63	6.81°	5.75°	84.46%	9.63%	0.36
Anterior retraction	23	1.85 mm	1.48 mm	80.10%	7.81%	16	1.84 mm	1.53 mm	83.46%	8.32%	0.21
Anterior derotation	29	8.31°	6.36°	76.55%	13.44%	22	7.76°	5.66°	72.94%	10.91%	0.31
Posterior expansion	22	1.62 mm	1.25 mm	77.58%	12.25%	18	1.57 mm	1.23 mm	78.50%	10.92%	0.81
Premolar derotation	11	6.74°	5.65°	83.78%	11.92%	9	7.32°	6.02°	82.20%	9.08%	0.75
Molar distal tipping	27	1.62 mm	1.3 mm	80.49%	9.59%	23	1.64 mm	1.27 mm	77.73%	12.93%	0.39
Posterior mesial tipping	8	1.52 mm	1.19 mm	78.88%	12.64%	12	1.79 mm	1.37 mm	76.71%	15.80%	0.75
Posterior intrusion	17	1.18 mm	0.95 mm	80.87%	7.26%	22	1.14 mm	0.93 mm	81.34%	7.48%	0.85

Baseline characteristics of participants included in the fina analysis_

	10-day group(N = 33)	14-day group(N = 30)
Gender (N, %)
Male	8 (24.24%)	6 (20.00%)
Female	25 (75.76%)	24 (80.00%)
Age (N, %)
≤45	32 (96.97%)	28 (93.33%)
>45	1 (3.03%)	2 (6.67%)
Malocclusion (N, %)
Class I	14 (42.42%)	11 (36.67%)
Class II	15 (45.45%)	13 (43.33%)
Class III	4 (12.12%)	6 (20.00%)
Initial incisor irregularity(mean ± standard deviation)	6.38 ± 2.44	6.53 ± 2.08
Visual analog scale (VAS) score(mean ± standard deviation)	0.06 ± 0.18	0.08 ± 0.26

Comparison of orthodontic tooth movement (OTM) efficacy between 10-day and 14-day groups at stage 16 (T2) of the Invisalign treatment_

	10-day group					14-day group
OTM	N	PredictedOTM	Actual OTM	Mean OTMefficacy	SD	N	PredictedOTM	Actual OTM	Mean OTMefficacy	SD	P-value
Anterior intrusion	100	2.09 mm	1.37 mm	65.66%	16.46%	93	1.93 mm	1.33 mm	69.09%	12.22%	0.09
Anterior extrusion	29	2.13 mm	1.41	66.15%	11.00%	26	2.06 mm	1.45 mm	70.25%	9.91%	0.15
Anterior proclination	72	11.95°	9.01°	75.40%	12.02%	66	11.42°	8.93°	78.23%	12.87%	0.18
Anterior retraction	51	2.14 mm	1.7 mm	79.58%	11.75%	43	2.12 mm	1.63 mm	76.92%	11.66%	0.28
Anterior derotation	41	9.52°	6.74°	70.80%	14.36%	35	9.14°	6.37°	69.73%	10.65%	0.75
Posterior expansion	29	1.84 mm	1.39 mm	75.63%	11.74%	38	1.97 mm	1.52 mm	77.00%	14.87%	0.66
Premolar derotation	16	7.57°	5.65°	74.66%	17.20%	19	8.54°	6.53°	76.46%	14.85%	0.75
Molar distal tipping	51	2.27 mm	1.76 mm	77.71%	11.74%	48	2.06 mm	1.57 mm	76.19%	10.88%	0.51
Posterior mesial tipping	12	1.83 mm	1.21 mm	65.72%	12.57%	17	1.91 mm	1.35 mm	70.92%	14.17%	0.32
Posterior intrusion	24	1.42 mm	1.04 mm	73.22%	9.67%	34	1.47 mm	1.12 mm	76.01%	10.11%	0.30

DOI: https://doi.org/10.2478/aoj-2023-0002 | Journal eISSN: 2207-7480 | Journal ISSN: 2207-7472

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Language: English

Page range: 1 - 12

Submitted on: Aug 1, 2022

Accepted on: Dec 1, 2022

Published on: Jan 27, 2023

Published by: Australian Society of Orthodontists Inc.

In partnership with: Paradigm Publishing Services

Publication frequency: 1 times per year

Related subjects:

Medicine,

Basic medical science,

Basic medical science, other

© 2023 Rui Zhao, Li Mei, Hu Long, Fan Jian, Wenli Lai, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 39 (2023): Issue 1 (January 2023)Next article

Changing clear aligners every 10 days or 14 days ? A randomised controlled trial

Figures & Tables

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Comparison of orthodontic tooth movement (OTM) efficacy between 10-day and 14-day groups at stage 8 (T1) of the Invisalign treatment_

Baseline characteristics of participants included in the fina analysis_

Comparison of orthodontic tooth movement (OTM) efficacy between 10-day and 14-day groups at stage 16 (T2) of the Invisalign treatment_

Paradigm

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