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A comparative in vitro study on monomer release from flash-free or conventional bonding systems
Baris Can Telatar1, Gul Yildiz Telatar2
1Department of Orthodontics, Faculty of Dentistry, Akdeniz University, Antalya, Turkey.
Clinical Oral Investigations
|March 5, 2025
Summary
Adhesive-precoated flash-free brackets released more residual monomers than traditional adhesives in vitro. Further research is needed to assess potential cytotoxic effects before clinical use.
Area of Science:
- Dental Materials Science
- Biomaterials
- Orthodontic Adhesives
Background:
- Orthodontic bracket debonding involves adhesive remnants.
- Residual monomers from adhesives may pose health risks.
- Flash-free adhesives aim to simplify clinical procedures.
Purpose of the Study:
- To quantify and compare residual monomer release from adhesive-precoated flash-free brackets versus traditional light-cure and chemical-cure adhesives.
- To identify specific monomers released by each adhesive system.
Main Methods:
- Sixty stainless steel brackets were bonded using three adhesive systems: adhesive-precoated flash-free, Transbond XT (light-cure), and a chemical-cure system.
- Liquid samples were collected at 1, 7, 21, and 35 days post-bonding.
- Residual monomer elution was analyzed using liquid chromatography.
Main Results:
- All tested adhesives released urethane dimethacrylate, triethylene glycol dimethacrylate, hydroxyethyl methacrylate, and Bisphenol A-glycidyl methacrylate.
- The adhesive-precoated flash-free system showed higher total monomer release (excluding hydroxyethyl methacrylate) compared to the other groups.
- The chemical-cure group exhibited the highest hydroxyethyl methacrylate release.
Conclusions:
- The adhesive-precoated flash-free system demonstrated the highest release of residual monomers in this in vitro study.
- Potential cytotoxic effects of the adhesive-precoated flash-free system warrant further investigation.
- This study is the first to evaluate monomer release from adhesive-precoated flash-free brackets, highlighting differences due to bracket base design and chemical composition.
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