| Initial Forces and Moments Delivered by Removable Thermoplastic Appliances during Rotation of an Upper Central Incisor. | |
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MedLine Citation:
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PMID: 19905847 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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ABSTRACT Objective: To determine the forces and moments delivered to a maxillary central incisor during rotation by three different thermoplastic appliances with identical thickness. Materials and Methods: Five identical appliances were manufactured from each of three materials (Ideal Clear 1.0 mm, Erkodur 1.0 mm, Biolon 1.0 mm). An upper central incisor fixed in a measuring device was rotated around its central axis in 0.5-degree steps to +/-2.5 degrees, +/-5 degrees, and +/-7.5 degrees (equivalent to an activation of +/-0.17 mm, +/-0.34 mm, and +/-0.51 mm of the incisor edge) in the clockwise and anticlockwise directions with the respective appliance fixed in place. For statistical analysis, the moments Tz (rotation) and forces Fz (intrusion) were tested. Means and standard deviations for Tz and median and 25% and 75% quantiles for Fz were calculated. An analysis of variance (ANOVA) was performed. Results: The minimal moment was determined at a rotation of -0.17 mm (-7.3 Nmm, +/-0.8), and the maximal moment at a deflection of -0.51 mm (-71.8 Nmm. +/-2.5) was recorded. The minimal value for Fz was measured at an activation of -0.17 mm (0.0 N), and the highest intrusive forces were evaluated for a rotation of -0.51 mm (-5.8 N). The particular material sometimes had a significant (P < .05) influence on the forces delivered and the moments. Conclusions: During rotation with aligners, an intrusive force can also be observed. The direction of rotation, and the materials used all exert an influence on the force delivery properties of the appliance. |
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Authors:
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Wolfram Hahn; Benjamin Engelke; Klaus Jung; Henning Dathe; Julia Fialka-Fricke; Dietmar Kubein-Meesenburg; Reza Sadat-Khonsari |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Angle orthodontist Volume: 80 ISSN: 0003-3219 ISO Abbreviation: Angle Orthod Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2009-11-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370550 Medline TA: Angle Orthod Country: United States |
Other Details:
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Languages: eng Pagination: 239-46 Citation Subset: D; IM |
Affiliation:
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a Assistant Professor, Department of Orthodontics, Georg-August-University, Goettingen, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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