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In vitro orthodontic bracket bonding to porcelain
R Al-Hity1, M-P Gustin, N Bridel
1Laboratoire des Multimatériaux et Interfaces (CNRS UMR 5615), Faculté d'Odontologie, Université Lyon 1, France. rafah.alhity@gmail.com
European Journal of Orthodontics
|March 31, 2011
Summary
This study found that ceramic brackets combined with high-intensity LED light achieved superior bond strength to porcelain compared to metal brackets. Porcelain fracture risk was reduced with metal brackets and high-intensity LED light.
Area of Science:
- Orthodontic Materials Science
- Biomaterials Engineering
- Dental Adhesives
Background:
- Achieving durable and reliable bonding of orthodontic brackets to porcelain restorations is crucial for effective treatment.
- Variations in bracket materials, adhesive types, and light-curing sources can significantly impact bond strength and failure modes.
- Understanding these interactions is essential for optimizing clinical protocols and minimizing iatrogenic damage.
Purpose of the Study:
- To evaluate the tensile bond strength and failure patterns of orthodontic brackets bonded to porcelain using different bracket types, adhesive composites, and light-curing units.
- To determine the influence of bracket material (ceramic vs. metal), adhesive composition (bis-GMA vs. UDMA), and light-curing intensity (LED vs. halogen) on bond performance.
- To assess the risk of porcelain fracture during debonding under various experimental conditions.
Main Methods:
- In vitro tensile bond strength testing on 160 porcelain samples bonded with either ceramic or metal brackets and two types of orthodontic composites.
- Utilized four different light-curing units (three LED, one halogen) with varying intensities.
- Porcelain surface conditioning with hydrofluoric acid and silane application prior to bonding; photo-polymerization for 40 seconds; storage in water at 37°C for 24 hours.
- Analysis of bond strength and failure modes using statistical methods in R language.
Main Results:
- All tested groups exhibited sufficient bond strength (>6 MPa) for orthodontic treatment.
- No significant difference in bond strength was observed between the two adhesive composites.
- A significant interaction between bracket type and light-curing source was found, with ceramic brackets showing higher bond strength when paired with LED light.
- Porcelain fracture occurred in 35% of ceramic bracket samples, with increased risk associated with UDMA composite and decreased risk with high-intensity LED light.
Conclusions:
- The combination of ceramic brackets and high-intensity LED light provides superior tensile bond strength to porcelain.
- Metal brackets demonstrate a lower risk of porcelain fracture during debonding compared to ceramic brackets.
- Adhesive type had no significant impact on bond strength, but UDMA composite increased fracture risk with ceramic brackets.
