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Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition

The objective of this study was to examine the distal rotation of mesial rotated maxillary first permanent molars in a sample of Class II dental malocclusion adult patients treated with Invisalign Clear Aligners (CA). Forty patients (20 males, 20 females, 22.4 ± 3.9 years) were included in the study...

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Autores principales: Lione, Roberta, Paoloni, Valeria, De Razza, Francesca Chiara, Pavoni, Chiara, Cozza, Paola
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9604589/
https://www.ncbi.nlm.nih.gov/pubmed/36294929
http://dx.doi.org/10.3390/life12101495
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author Lione, Roberta
Paoloni, Valeria
De Razza, Francesca Chiara
Pavoni, Chiara
Cozza, Paola
author_facet Lione, Roberta
Paoloni, Valeria
De Razza, Francesca Chiara
Pavoni, Chiara
Cozza, Paola
author_sort Lione, Roberta
collection PubMed
description The objective of this study was to examine the distal rotation of mesial rotated maxillary first permanent molars in a sample of Class II dental malocclusion adult patients treated with Invisalign Clear Aligners (CA). Forty patients (20 males, 20 females, 22.4 ± 3.9 years) were included in the study sample (Department of Orthodontics of University of Rome “Tor Vergata”). Inclusion criteria were: Caucasian ancestry, complete permanent dentition with fully erupted upper second molars, Class II molar relationship, absence of tooth or craniofacial anomalies or caries and periodontal diseases. Pre-treatment (T1), post-treatment (T2) digital casts, and final ClinCheck simulation models (T2CC) were analysed. To measure the rotation of maxillary first molars, Henry’s angle (H°) was evaluated. Maxillary first molars with an H° > 11° were considered mesio-rotated (in total 59 teeth). The treatment CA protocol included disto-rotation without distalization movements. At T1, T2 and T2CC five measurements on the collected dental casts were analysed: Henry’s angle (H°); mesial buccal expansion (ME); distal buccal expansion (DE); mesial buccal sagittal (MS); and distal buccal sagittal (DS). A comparison between the results of T2-T1 and T2CC-T2 was performed using a paired t-test. The differences between T2-T1 highlighted a significant distal rotation of the maxillary first molars (−7.4°) and an expansion movement of 2.20 mm for ME and 1.50 mm for DE. In the post-treatment, the mesial buccal cusps shifted of 1.0 mm, while the distal buccal cusps showed a distal movement of 0.9 mm. Analysing the H° comparison between T2CC-T2, the difference was −1.1°. The T2CC-T2 comparison in the sagittal plane showed a difference of 0.9 mm for the MS and 0.7 mm for the DS. The accuracy was 82% for molar derotation movement. In conclusion, CA provides the upper arch expansion associated with the upper first molars’ distal rotation. These movements provide 2 mm of improvement in arch perimeter and molar intercuspation.
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spelling pubmed-96045892022-10-27 Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition Lione, Roberta Paoloni, Valeria De Razza, Francesca Chiara Pavoni, Chiara Cozza, Paola Life (Basel) Article The objective of this study was to examine the distal rotation of mesial rotated maxillary first permanent molars in a sample of Class II dental malocclusion adult patients treated with Invisalign Clear Aligners (CA). Forty patients (20 males, 20 females, 22.4 ± 3.9 years) were included in the study sample (Department of Orthodontics of University of Rome “Tor Vergata”). Inclusion criteria were: Caucasian ancestry, complete permanent dentition with fully erupted upper second molars, Class II molar relationship, absence of tooth or craniofacial anomalies or caries and periodontal diseases. Pre-treatment (T1), post-treatment (T2) digital casts, and final ClinCheck simulation models (T2CC) were analysed. To measure the rotation of maxillary first molars, Henry’s angle (H°) was evaluated. Maxillary first molars with an H° > 11° were considered mesio-rotated (in total 59 teeth). The treatment CA protocol included disto-rotation without distalization movements. At T1, T2 and T2CC five measurements on the collected dental casts were analysed: Henry’s angle (H°); mesial buccal expansion (ME); distal buccal expansion (DE); mesial buccal sagittal (MS); and distal buccal sagittal (DS). A comparison between the results of T2-T1 and T2CC-T2 was performed using a paired t-test. The differences between T2-T1 highlighted a significant distal rotation of the maxillary first molars (−7.4°) and an expansion movement of 2.20 mm for ME and 1.50 mm for DE. In the post-treatment, the mesial buccal cusps shifted of 1.0 mm, while the distal buccal cusps showed a distal movement of 0.9 mm. Analysing the H° comparison between T2CC-T2, the difference was −1.1°. The T2CC-T2 comparison in the sagittal plane showed a difference of 0.9 mm for the MS and 0.7 mm for the DS. The accuracy was 82% for molar derotation movement. In conclusion, CA provides the upper arch expansion associated with the upper first molars’ distal rotation. These movements provide 2 mm of improvement in arch perimeter and molar intercuspation. MDPI 2022-09-26 /pmc/articles/PMC9604589/ /pubmed/36294929 http://dx.doi.org/10.3390/life12101495 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lione, Roberta
Paoloni, Valeria
De Razza, Francesca Chiara
Pavoni, Chiara
Cozza, Paola
Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title_full Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title_fullStr Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title_full_unstemmed Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title_short Analysis of Maxillary First Molar Derotation with Invisalign Clear Aligners in Permanent Dentition
title_sort analysis of maxillary first molar derotation with invisalign clear aligners in permanent dentition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9604589/
https://www.ncbi.nlm.nih.gov/pubmed/36294929
http://dx.doi.org/10.3390/life12101495
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