ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this study, the effects of bracket designs and force direction on fracture strength ofalumina bracket were evaluated. Two differently designed alumina brackets (MISO, HT Co., Ltd.,Seoul, Korea) were tested. Each bracket was bonded with orthodontic adhesive to stainless steelcylinder. Compressive force was applied to the tie wing of bracket at 30°, 60°, and 90° to the longaxis of the test device. Fracture strengths were assessed by using a universal testing machine(Instron 3366, Instron Co., Ltd., U.S.A.). Fractured bracket surfaces were examined using SEM.Statistical analysis was performed by using SPSS 9.0 for Windows program. Paired samples t-testsand Kruskal-wallis tests were used at P〈0.05. The fracture strength ranged from 150 N with theocclusal wing to 63 N with the cervical wing in bracket A. A significant difference was founded infracture strength between the bracket designs and force directions. Based on this result, it could beconcluded that bracket designs and force direction was important rule to improve fracture strengthof ceramic bracket
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1353.pdf
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