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The predictability of orthodontic tooth movements through clear aligner among first-premolar extraction patients: a multivariate analysis

Background The purpose was to determine the predictability of tooth movements through clear aligner among premolar extraction patients and to explore the effects of various factors on tooth movements. Methods A total of 31 extraction patients (10 males and 20 females; age 14–44) receiving clear alig...

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Published in:Progress in orthodontics 2022-12, Vol.23 (1), p.52-52, Article 52
Main Authors: Ren, Linghuan, Liu, Lu, Wu, Zhouqiang, Shan, Di, Pu, Lingling, Gao, Yanzi, Tang, Ziwei, Li, Xiaolong, Jian, Fan, Wang, Yan, Long, Hu, Lai, Wenli
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creator Ren, Linghuan
Liu, Lu
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Tang, Ziwei
Li, Xiaolong
Jian, Fan
Wang, Yan
Long, Hu
Lai, Wenli
description Background The purpose was to determine the predictability of tooth movements through clear aligner among premolar extraction patients and to explore the effects of various factors on tooth movements. Methods A total of 31 extraction patients (10 males and 20 females; age 14–44) receiving clear aligner treatment (Invisalign) were enrolled in this study. The actual post-treatment models and pre-treatment models were superimposed using the palatal area as a reference and registered with virtual post-treatment models. A paired t test was used to compare the differences between actual and designed tooth movements of maxillary first molars, canines, and central incisors. A multivariate linear mixed model was performed to examine the influence of variables on actual tooth movements. Results Compared to the designed tooth movements, the following undesirable tooth movements occurred: mesial movement (2.2 mm), mesial tipping (5.4°), and intrusion (0.45 mm) of first molars; distal tipping (11.0°), lingual tipping (4.4°), and distal rotation of canines (4.9°); lingual tipping (10.6°) and extrusion (1.5 mm) of incisors. Age, crowding, mini-implant, overbite, and attachments have differential effects on actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable canine and incisor tooth movements over optimized attachments. Lingual tipping and extrusion of incisors were significantly influenced by the interaction effects between incisor power ridge and different canine attachments ( p  
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Methods A total of 31 extraction patients (10 males and 20 females; age 14–44) receiving clear aligner treatment (Invisalign) were enrolled in this study. The actual post-treatment models and pre-treatment models were superimposed using the palatal area as a reference and registered with virtual post-treatment models. A paired t test was used to compare the differences between actual and designed tooth movements of maxillary first molars, canines, and central incisors. A multivariate linear mixed model was performed to examine the influence of variables on actual tooth movements. Results Compared to the designed tooth movements, the following undesirable tooth movements occurred: mesial movement (2.2 mm), mesial tipping (5.4°), and intrusion (0.45 mm) of first molars; distal tipping (11.0°), lingual tipping (4.4°), and distal rotation of canines (4.9°); lingual tipping (10.6°) and extrusion (1.5 mm) of incisors. Age, crowding, mini-implant, overbite, and attachments have differential effects on actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable canine and incisor tooth movements over optimized attachments. Lingual tipping and extrusion of incisors were significantly influenced by the interaction effects between incisor power ridge and different canine attachments ( p  &lt; 0.05). Conclusions Incisors, canines, and first molars are subject to unwanted tooth movements with clear aligners among premolar extraction patients. Age, crowding, mini-implant, overbite, and attachments influence actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable incisor tooth movements over optimized canine attachments.</description><identifier>ISSN: 2196-1042</identifier><identifier>ISSN: 1723-7785</identifier><identifier>EISSN: 2196-1042</identifier><identifier>DOI: 10.1186/s40510-022-00447-y</identifier><identifier>PMID: 36581703</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Age ; Bicuspid - surgery ; Biomechanics ; Canine teeth ; Dentistry ; Design ; Female ; Humans ; Incisors ; Male ; Malocclusion - therapy ; Malocclusion, Angle Class II ; Medicine ; Molars ; Multivariate Analysis ; Oral diseases ; Orthodontic Appliances, Removable ; Orthodontics ; Overbite ; Software ; Teeth ; Tooth Movement Techniques ; Transplants &amp; implants</subject><ispartof>Progress in orthodontics, 2022-12, Vol.23 (1), p.52-52, Article 52</ispartof><rights>The Author(s) 2022</rights><rights>2022. The Author(s).</rights><rights>The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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Methods A total of 31 extraction patients (10 males and 20 females; age 14–44) receiving clear aligner treatment (Invisalign) were enrolled in this study. The actual post-treatment models and pre-treatment models were superimposed using the palatal area as a reference and registered with virtual post-treatment models. A paired t test was used to compare the differences between actual and designed tooth movements of maxillary first molars, canines, and central incisors. A multivariate linear mixed model was performed to examine the influence of variables on actual tooth movements. Results Compared to the designed tooth movements, the following undesirable tooth movements occurred: mesial movement (2.2 mm), mesial tipping (5.4°), and intrusion (0.45 mm) of first molars; distal tipping (11.0°), lingual tipping (4.4°), and distal rotation of canines (4.9°); lingual tipping (10.6°) and extrusion (1.5 mm) of incisors. Age, crowding, mini-implant, overbite, and attachments have differential effects on actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable canine and incisor tooth movements over optimized attachments. Lingual tipping and extrusion of incisors were significantly influenced by the interaction effects between incisor power ridge and different canine attachments ( p  &lt; 0.05). Conclusions Incisors, canines, and first molars are subject to unwanted tooth movements with clear aligners among premolar extraction patients. Age, crowding, mini-implant, overbite, and attachments influence actual tooth movements. 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Liu, Lu ; Wu, Zhouqiang ; Shan, Di ; Pu, Lingling ; Gao, Yanzi ; Tang, Ziwei ; Li, Xiaolong ; Jian, Fan ; Wang, Yan ; Long, Hu ; Lai, Wenli</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c579t-f3f92f6a89042a3f8eb9256eb60af8325597e16bcb14e784d8ffb77728fa2fa03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Age</topic><topic>Bicuspid - surgery</topic><topic>Biomechanics</topic><topic>Canine teeth</topic><topic>Dentistry</topic><topic>Design</topic><topic>Female</topic><topic>Humans</topic><topic>Incisors</topic><topic>Male</topic><topic>Malocclusion - therapy</topic><topic>Malocclusion, Angle Class II</topic><topic>Medicine</topic><topic>Molars</topic><topic>Multivariate Analysis</topic><topic>Oral diseases</topic><topic>Orthodontic Appliances, Removable</topic><topic>Orthodontics</topic><topic>Overbite</topic><topic>Software</topic><topic>Teeth</topic><topic>Tooth Movement Techniques</topic><topic>Transplants &amp; 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Methods A total of 31 extraction patients (10 males and 20 females; age 14–44) receiving clear aligner treatment (Invisalign) were enrolled in this study. The actual post-treatment models and pre-treatment models were superimposed using the palatal area as a reference and registered with virtual post-treatment models. A paired t test was used to compare the differences between actual and designed tooth movements of maxillary first molars, canines, and central incisors. A multivariate linear mixed model was performed to examine the influence of variables on actual tooth movements. Results Compared to the designed tooth movements, the following undesirable tooth movements occurred: mesial movement (2.2 mm), mesial tipping (5.4°), and intrusion (0.45 mm) of first molars; distal tipping (11.0°), lingual tipping (4.4°), and distal rotation of canines (4.9°); lingual tipping (10.6°) and extrusion (1.5 mm) of incisors. Age, crowding, mini-implant, overbite, and attachments have differential effects on actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable canine and incisor tooth movements over optimized attachments. Lingual tipping and extrusion of incisors were significantly influenced by the interaction effects between incisor power ridge and different canine attachments ( p  &lt; 0.05). Conclusions Incisors, canines, and first molars are subject to unwanted tooth movements with clear aligners among premolar extraction patients. Age, crowding, mini-implant, overbite, and attachments influence actual tooth movements. Moreover, vertical rectangular attachments on canines are beneficial in achieving more predictable incisor tooth movements over optimized canine attachments.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>36581703</pmid><doi>10.1186/s40510-022-00447-y</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0002-6020-6559</orcidid><oa>free_for_read</oa></addata></record>
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source Springer Nature - SpringerLink Journals - Fully Open Access ; PubMed Central
subjects Age
Bicuspid - surgery
Biomechanics
Canine teeth
Dentistry
Design
Female
Humans
Incisors
Male
Malocclusion - therapy
Malocclusion, Angle Class II
Medicine
Molars
Multivariate Analysis
Oral diseases
Orthodontic Appliances, Removable
Orthodontics
Overbite
Software
Teeth
Tooth Movement Techniques
Transplants & implants
title The predictability of orthodontic tooth movements through clear aligner among first-premolar extraction patients: a multivariate analysis
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