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Related Experiment Videos

Bracket bond strength dependence on light power density.

Christine Bettina Staudt1, Ivo Krejci, Anestis Mavropoulos

  • 1Division of Orthodontics, University of Geneva, Switzerland. christine.staudt@medecine.unige.ch <christine.staudt@medecine.unige.ch>

Journal of Dentistry
|January 3, 2006
PubMed
Summary

Higher power density (PD) in light-cured composites significantly increases shear bond strength (SBS) up to a saturation point. Achieving optimal SBS comparable to traditional methods requires a PD of at least 3000 mW/cm(2).

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Area of Science:

  • Dental materials science
  • Biomaterials engineering
  • Polymer chemistry

Background:

  • Manufacturers increase light source power density (PD) to reduce curing time for light-cured composites.
  • Understanding the relationship between PD and shear bond strength (SBS) is crucial for optimizing dental adhesive systems.

Purpose of the Study:

  • To investigate the relationship between power density (PD) and shear bond strength (SBS) of light-cured composites at short exposure times.
  • To determine the optimal PD for achieving maximum SBS in bracket bonding.

Main Methods:

  • Stainless steel brackets were bonded to bovine incisors using light-cured adhesive.
  • Groups were exposed to varying PDs (500–3000 mW/cm²) for 4s, with extended durations at 3000 mW/cm².
  • Control group received 1000 mW/cm² for 40s; SBS and adhesive remnant index (ARI) were measured.

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Main Results:

  • SBS varied significantly across different PDs (ANOVA, p<0.001).
  • PDs of at least 3000 mW/cm² were needed to achieve SBS comparable to the control group.
  • An exponential model indicated SBS saturation around 4000 mW/cm², reaching 85% of maximum SBS.

Conclusions:

  • SBS is dependent on PD, providing data for light-curing system development.
  • Increasing PD beyond a certain threshold yields diminishing returns in SBS due to saturation effects.
  • Higher PD correlated with improved adhesion at the bracket/adhesive interface, as indicated by ARI scores.