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Bond Strength of Universal Self-Etch 1-Step Adhesive Systems for Orthodontic Brackets
Universal self-etch adhesives showed insufficient shear bond strength (SBS) for orthodontic bracket bonding on uncut enamel. None met the required SBS standards at 24 hours or 6 months in this study.
Area of Science:
- Dental Materials Science
- Orthodontic Adhesion
- Biomaterials
Background:
- Universal adhesives offer simplified application in orthodontics.
- Assessing their bond strength on uncut enamel is crucial for clinical success.
- Previous studies show varied results with universal adhesives.
Purpose of the Study:
- To evaluate the shear bond strength (SBS) of orthodontic brackets.
- To compare universal self-etch 1-step adhesives against a multi-step control.
- To assess bond durability over 6 months on uncut enamel.
Main Methods:
- 160 uncut premolars were bonded with 3 universal adhesives (SU, BU, CU) or a control.
- Shear bond strength (SBS) and Adhesive Remnant Index (ARI) were measured after 24h and 6 months.
- Quantitative resin analysis (%RR) and SEM imaging were performed.
Main Results:
- Universal adhesives did not achieve satisfactory SBS for orthodontic treatment at either time point.
- The control group exhibited significantly higher SBS, ARI, and %RR compared to universal adhesives.
- SBS and ARI decreased over time for SU and BU, but remained stable for CU.
Conclusions:
- Universal adhesives in self-etch mode are not recommended for bonding orthodontic brackets to uncut enamel.
- Current universal adhesives do not provide sufficient bond strength for reliable orthodontic treatment.
- Further research is needed to improve universal adhesive performance in orthodontics.
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