Document Detail

Fracture strength of different soldered and welded orthodontic joining configurations with and without filling material.
MedLine Citation:
PMID:  19089229     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to compare the mechanical strength of different joints made by conventional brazing, TIG and laser welding with and without filling material. Five standardized joining configurations of orthodontic wire in spring hard quality were used: round, cross, 3 mm length, 9 mm length and 7 mm to orthodontic band. The joints were made by five different methods: brazing, tungsten inert gas (TIG) and laser welding with and without filling material. For the original orthodontic wire and for each kind of joint configuration or connecting method 10 specimens were carefully produced, totalizing 240. The fracture strengths were measured with a universal testing machine (Zwick 005). Data were analyzed by ANOVA (p=0.05) and Bonferroni post hoc test (p=0.05). In all cases, brazing joints were ruptured on a low level of fracture strength (186-407 N). Significant differences between brazing and TIG or laser welding (p<0.05, Bonferroni post hoc test) were found in each joint configuration. The highest fracture strength means were observed for laser welding with filling material and 3 mm joint length (998 N). Using filling materials, there was a clear tendency to higher mean values of fracture strength in TIG and laser welding. However, statistically significant differences were found only in the 9-mm long joints (p<0.05, Bonferroni post hoc test). In conclusion, the fracture strength of welded joints was positively influenced by the additional use of filling material. TIG welding was comparable to laser welding except for the impossibility of joining orthodontic wire with orthodontic band.
Jens Johannes Bock; Jacqueline Bailly; Christian Ralf Gernhardt; Robert Andreas Werner Fuhrmann
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of applied oral science : revista FOB     Volume:  16     ISSN:  1678-7765     ISO Abbreviation:  J Appl Oral Sci     Publication Date:    2008 Sep-Oct
Date Detail:
Created Date:  2008-12-17     Completed Date:  2009-03-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189774     Medline TA:  J Appl Oral Sci     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  328-35     Citation Subset:  D; IM    
Department of Orthodontics, Martin-Luther-University Halle, Wittenberg, Germany.
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MeSH Terms
Dental Alloys
Dental Soldering / methods*
Dental Stress Analysis*
Lasers, Solid-State
Materials Testing
Orthodontic Appliance Design*
Orthodontic Wires*
Tensile Strength
Welding / methods
Reg. No./Substance:
0/Dental Alloys; 7440-33-7/Tungsten

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

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