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Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics

The goal of our study is to launch magnetic force-driven orthodontics. This continuous study investigated the influence of magnet position on tipping and bodily tooth movement, using 3D printing technology and digital analysis. Orthodontic typodont models (TMs) for space-closure were 3D printed to m...

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Autores principales: Ishida, Yoshiki, Kuwajima, Yukinori, Lee, Cliff, Ogawa, Kaho, Da Silva, John D., Ishikawa-Nagai, Shigemi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7475987/
https://www.ncbi.nlm.nih.gov/pubmed/32823770
http://dx.doi.org/10.3390/ma13163588
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author Ishida, Yoshiki
Kuwajima, Yukinori
Lee, Cliff
Ogawa, Kaho
Da Silva, John D.
Ishikawa-Nagai, Shigemi
author_facet Ishida, Yoshiki
Kuwajima, Yukinori
Lee, Cliff
Ogawa, Kaho
Da Silva, John D.
Ishikawa-Nagai, Shigemi
author_sort Ishida, Yoshiki
collection PubMed
description The goal of our study is to launch magnetic force-driven orthodontics. This continuous study investigated the influence of magnet position on tipping and bodily tooth movement, using 3D printing technology and digital analysis. Orthodontic typodont models (TMs) for space-closure were 3D printed to mimic maxillary central incisors. Nd-Fe-B magnets were placed in the middle third (Model-M), and the cervical third (Model-C), of the tooth. TMs, before and after movement, were digitally scanned and superimposed. The 3D digital coordinates (X, Y, and Z axes), and rotations (yaw, pitch, and roll) of the tooth crown and root, were calculated and compared between the two magnet position settings. Model-M showed higher rates of movement, but more rotation than Model-C (p < 0.01). The root apex of Model-M moved in the opposite direction of the crown (R = −0.29), indicating tipping movement. In contrast, the crown and root apex moved in the same direction (R = 0.56) in Model-C, indicating bodily movement. These patterns were confirmed in a typodont model of a moderate crowding case. The results validated that modifying the magnet position increased the amount of bodily tooth movement, and decreased rotation/tipping in an ex vivo setting.
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spelling pubmed-74759872020-09-09 Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics Ishida, Yoshiki Kuwajima, Yukinori Lee, Cliff Ogawa, Kaho Da Silva, John D. Ishikawa-Nagai, Shigemi Materials (Basel) Article The goal of our study is to launch magnetic force-driven orthodontics. This continuous study investigated the influence of magnet position on tipping and bodily tooth movement, using 3D printing technology and digital analysis. Orthodontic typodont models (TMs) for space-closure were 3D printed to mimic maxillary central incisors. Nd-Fe-B magnets were placed in the middle third (Model-M), and the cervical third (Model-C), of the tooth. TMs, before and after movement, were digitally scanned and superimposed. The 3D digital coordinates (X, Y, and Z axes), and rotations (yaw, pitch, and roll) of the tooth crown and root, were calculated and compared between the two magnet position settings. Model-M showed higher rates of movement, but more rotation than Model-C (p < 0.01). The root apex of Model-M moved in the opposite direction of the crown (R = −0.29), indicating tipping movement. In contrast, the crown and root apex moved in the same direction (R = 0.56) in Model-C, indicating bodily movement. These patterns were confirmed in a typodont model of a moderate crowding case. The results validated that modifying the magnet position increased the amount of bodily tooth movement, and decreased rotation/tipping in an ex vivo setting. MDPI 2020-08-13 /pmc/articles/PMC7475987/ /pubmed/32823770 http://dx.doi.org/10.3390/ma13163588 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ishida, Yoshiki
Kuwajima, Yukinori
Lee, Cliff
Ogawa, Kaho
Da Silva, John D.
Ishikawa-Nagai, Shigemi
Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title_full Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title_fullStr Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title_full_unstemmed Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title_short Effect of Magnet Position on Tipping and Bodily Tooth Movement in Magnetic Force-Driven Orthodontics
title_sort effect of magnet position on tipping and bodily tooth movement in magnetic force-driven orthodontics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7475987/
https://www.ncbi.nlm.nih.gov/pubmed/32823770
http://dx.doi.org/10.3390/ma13163588
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