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In vitro cyclic shear fatigue of the bracket-adhesive complex: a pilot study
N Daratsianos1, A Jäger, T Eliades
1Department of Orthodontics, University of Bonn, Welschnonnenstr. 17, 53111, Bonn, Germany. nikolaos.daratsianos@uni-bonn.de
Summary
Shear fatigue testing of orthodontic bracket-adhesive bonds showed variable effects on bond strength. Bracket and adhesive type significantly influenced outcomes more than fatigue itself.
Area of Science:
- Orthodontic materials science
- Biomaterials engineering
- Dental research
Background:
- The bracket-adhesive complex is crucial for orthodontic treatment success.
- Understanding the impact of fatigue on bond strength is essential for clinical durability.
Purpose of the Study:
- To evaluate the effect of shear fatigue on the shear strength of the bracket-adhesive complex.
- To compare different bracket base designs and adhesive systems under fatigue conditions.
Main Methods:
- Brackets with laser-structured and foil mesh bases were bonded using two adhesives.
- Specimens underwent aging, shear-strength testing, and shear-fatigue testing (1,000 cycles) using the staircase method.
- Shear strength of fatigued and non-fatigued specimens was compared.
Main Results:
- Fatigue testing resulted in an 8% shear strength gain in one group and a 10% loss in another.
- No significant differences were found in two other material groups.
- Bracket type and adhesive system significantly influenced shear strength, more so than fatigue.
Conclusions:
- Shear fatigue has a variable, material-dependent effect on bracket-adhesive complex strength.
- Bracket and adhesive type are more influential factors on shear strength than 1,000 cycles of fatigue.
