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Post-gel shrinkage, elastic modulus, and stress generated by orthodontic adhesives
The Angle Orthodontist
|September 24, 2019
Summary
Orthodontic adhesives exhibit varying post-gel shrinkage, elastic modulus, and flexural strength. Finite element analysis (FEA) predicts that this shrinkage generates stress in the adhesive and surrounding enamel.
Area of Science:
- Dental Materials Science
- Orthodontic Engineering
- Biomaterials
Background:
- Orthodontic adhesives are crucial for bracket bonding.
- Understanding material properties like shrinkage and modulus is vital for clinical success.
- Shrinkage can lead to stress development, potentially affecting bond integrity and tooth structure.
Purpose of the Study:
- To quantify post-gel shrinkage, elastic modulus, and flexural strength of six orthodontic adhesives.
- To predict shrinkage-induced stresses using finite element analysis (FEA).
Main Methods:
- Six orthodontic adhesives were tested for post-gel shrinkage using a biaxial strain gauge.
- Elastic modulus and flexural strength were determined via a 4-point bending test.
- Finite element analysis (FEA) modeled stress distribution around bonded brackets.
Main Results:
- Significant differences (P ≤ .0001) were observed in all tested properties among adhesives.
- Transbond XT and GoTo showed the lowest post-gel shrinkage, while Transbond Plus Color Change had the highest.
- OrthoConnect exhibited the lowest elastic modulus, and GoTo the highest; Trulock had the lowest flexural strength, and Greengloo the highest.
Conclusions:
- Post-gel shrinkage of orthodontic adhesives is comparable to restorative composites.
- FEA simulations indicate that adhesive shrinkage induces stress in the adhesive layer and adjacent enamel.
- Material selection should consider shrinkage and mechanical properties to minimize stress generation.
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