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Tensile properties of orthodontic elastomeric chains
T Eliades1, G Eliades, N Silikas
1Biomaterials Science Unit, Dental School, University of Manchester, UK.
European Journal of Orthodontics
|May 8, 2004
Summary
This study evaluated elastomeric chains, finding no significant impact of chain type or intraoral aging on permanent elongation or tensile strength. Toughness varied inconsistently with tensile strength due to deformation differences.
Area of Science:
- Biomaterials Science
- Dental Materials Science
- Polymer Science
Background:
- Elastomeric chains are crucial in orthodontic treatment for applying controlled forces.
- Understanding the mechanical properties of these chains under various conditions is essential for predictable clinical outcomes.
Purpose of the Study:
- To investigate the effects of aging and intraoral exposure on the permanent elongation, tensile strength, and toughness of different elastomeric chains.
- To compare the mechanical behavior of open and closed elastomeric chain designs from various brands.
Main Methods:
- Six groups of elastomeric chains (three brands, open/closed types) were tested.
- Specimens were analyzed in four states: as-received, pre-strained, 24-hour intraoral exposure, and 3-week intraoral exposure.
- Tensile stress testing was performed, with data analyzed using three-way ANOVA and Tukey's test.
Main Results:
- No significant effect of modular geometry or chain type on permanent elongation was observed.
- Specimen aging or intraoral exposure did not correlate with changes in tensile strength.
- Toughness results did not consistently align with tensile strength rankings, indicating complex deformation behavior.
Conclusions:
- Elastomeric chain design (open vs. closed) and intraoral aging do not significantly alter permanent elongation or tensile strength.
- The mechanical response, particularly toughness, is influenced by factors beyond simple tensile strength, likely related to elastic and plastic deformation characteristics.