| In vitro evaluation of force-expansion characteristics in a newly designed orthodontic expansion screw compared to conventional screws. | |
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MedLine Citation:
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PMID: 20139567 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Expansion screws like Hyrax, Haas and other types, produce heavy interrupted forces which are unfavorable for dental movement and could be harmful to the tooth and periodontium. The other disadvantage of these screws is the need for patient cooperation for their regular activation. The purpose of this study was to design a screw and compare its force- expansion curve with other types. MATERIALS AND METHODS: A new screw was designed and fabricated in the same dimension, with conventional types, with the ability of 8 mm expansion (Free wire length: 12 mm, initial compression: 4.5 mm, spring wire diameter: 0.4 mm, spring diameter: 3 mm, number of the coils: n0 ine, material: s0 tainless steel). In this in vitro study, the new screw was placed in an acrylic orthodontic appliance, and after mounting on a stone cast, the force-expansion curve was evaluated by a compression test machine and compared to other screws. RESULTS: Force-expansion curve of designed screw had a flatter inclination compared to other screws. Generally it produced a light continuous force (two to 3.5 pounds) for every 4 mm of expansion. CONCLUSION: In comparison with heavy and interrupted forces of other screws, the newly designed screw created light and continuous forces. |
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Authors:
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Morteza Oshagh; S H Momeni Danaei; M R Hematian; M R Oshagh; A Hadiun Zade; A A Saboori |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Indian journal of dental research : official publication of Indian Society for Dental Research Volume: 20 ISSN: 1998-3603 ISO Abbreviation: Indian J Dent Res Publication Date: 2009 Oct-Dec |
Date Detail:
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Created Date: 2010-02-08 Completed Date: 2010-05-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9202990 Medline TA: Indian J Dent Res Country: India |
Other Details:
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Languages: eng Pagination: 437-41 Citation Subset: D |
Affiliation:
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Department of Orthodontics, Shiraz Dental School, Shiraz, Iran. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Dental Alloys
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chemistry Humans Materials Testing Orthodontic Appliance Design* Orthodontic Wires Palatal Expansion Technique / instrumentation* Stainless Steel / chemistry Stress, Mechanical Surface Properties |
| Chemical | |
Reg. No./Substance:
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0/Dental Alloys; 12597-68-1/Stainless Steel |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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