| A novel pressure film approach for determining the force imparted by clear removable thermoplastic appliances. | |
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MedLine Citation:
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PMID: 18085439 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The force imparted by removable thermoplastic appliances (RTA) onto teeth has not been investigated in the past. This investigation was designed to explore a novel methodology to measure the magnitude and identify the pattern of this force. Eight patients with moderate malocclusion were selected. In each patient, the palatally mal-positioned upper first premolar was corrected by wearing a series of four ClearSmile RTA over a duration of 8 weeks. When constructing RTA, the ClearSmile Company was advised that the amount of movement to be programmed into each appliance was 0.5 mm. The Pressurex film was used to measure the pressure generated by ClearSmile RTA against the palatal surface of the upper first premolar for buccal tipping movement. Three measurements were conducted respectively upon the issue and retrieval of each appliance (after 2 weeks of wear), resulting in 24 pressure measurements for each patient. Digital imaging and spectrophotometry analysis were employed to quantify the stain intensity mounted by the pressure on the films. The irrelevant forces were subtracted out to allow an assessment of the force purely acting to buccally repositioning the tooth. The results revealed that (1) the mean force magnitude over 2 weeks of RTA wear was 1.12 N (SE = 0.72 N); (2) the higher force magnitude of 5.12 N (SE = 0.80 N) seen at the issue of the appliance declined drastically to -2.67 N at the time of retrieval. These findings suggest that ClearSmile RTA exerts a high level of force against the tooth to be moved at the initial stage followed by a rapid force diminish. |
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Authors:
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Laura J Barbagallo; Gang Shen; Allan S Jones; Michael V Swain; Peter Petocz; M Ali Darendeliler |
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Publication Detail:
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Type: Evaluation Studies; Journal Article Date: 2007-12-18 |
Journal Detail:
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Title: Annals of biomedical engineering Volume: 36 ISSN: 1521-6047 ISO Abbreviation: Ann Biomed Eng Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-01-21 Completed Date: 2008-02-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0361512 Medline TA: Ann Biomed Eng Country: United States |
Other Details:
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Languages: eng Pagination: 335-41 Citation Subset: IM |
Affiliation:
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Department of Orthodontics, Faculty of Dentistry, Sydney Dental Hospital, The University of Sydney, Level 2, 2 Chalmers Street, Surry Hills, NSW 2010, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bite Force* Equipment Failure Analysis / instrumentation*, methods Humans Malocclusion / physiopathology*, rehabilitation* Manometry / instrumentation*, methods Membranes, Artificial* Orthodontic Appliances, Removable* |
| Chemical | |
Reg. No./Substance:
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0/Membranes, Artificial |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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