Document Detail

Deformation of metal brackets: a comparative study.
MedLine Citation:
PMID:  7978523     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine the effect of material and design on the force and stress required to permanently deform metal brackets. Fourteen types of metal brackets were categorized according to raw material composition, slot torque degree, and wing type. Five types of raw materials, three types of slot torque degree, and four types of wing design were tested using an archwire torque test developed by Flores. An analysis of variance (ANOVA) and t-test showed that all three categories had a significant effect on the force and stress needed to permanently deform metal brackets. Of the three, raw material had the greatest effect on the amount of force. Results showed that 17-4PH and 303S had higher yield strengths and regular twin brackets had higher resistance to deformation. Also, as slot torque degree increased, brackets deformed with less force. Result confirmed that brackets requiring the greatest stress to permanently deform were made of steel with the greatest hardness.
D A Flores; L K Choi; J M Caruso; J L Tomlinson; G E Scott; M T Jeiroudi
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The Angle orthodontist     Volume:  64     ISSN:  0003-3219     ISO Abbreviation:  Angle Orthod     Publication Date:  1994  
Date Detail:
Created Date:  1994-12-01     Completed Date:  1994-12-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  283-90     Citation Subset:  D; IM    
Loma Linda University School of Dentistry, CA 92350.
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MeSH Terms
Analysis of Variance
Dental Alloys / chemistry*
Materials Testing
Orthodontic Appliance Design*
Orthodontic Brackets*
Orthodontic Wires
Stainless Steel / chemistry
Stress, Mechanical
Surface Properties
Tensile Strength
Reg. No./Substance:
0/Dental Alloys; 12597-68-1/Stainless Steel
Erratum In:
Angle Orthod 1995;65(3):166

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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