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Related Experiment Videos

Bond strengths of ceramic brackets using different bonding techniques

S J Blight1, E Lynch

  • 1Department of Orthodontic, Dental School, Royal London Hospital, UK.

British Journal of Orthodontics
|February 1, 1995
PubMed
Summary

Nitric acid etching for ceramic orthodontic brackets offers comparable bond strength to phosphoric acid. Resin-modified glass ionomer cements resulted in lower bond strengths compared to composite resin.

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Area of Science:

  • Dental materials science
  • Orthodontic research

Background:

  • Ceramic orthodontic brackets offer aesthetic advantages.
  • Effective bonding to etched enamel is crucial for bracket retention.
  • Evaluating different etchants and luting agents is essential for clinical success.

Purpose of the Study:

  • To compare shear bond strengths of ceramic brackets bonded to etched enamel.
  • To assess the site of bond failure with different etching agents and luting materials.
  • To evaluate the efficacy of nitric acid versus phosphoric acid for enamel etching.

Main Methods:

  • Laboratory investigation comparing shear bond strengths.
  • Enamel etching using 2.5% nitric acid and 37% phosphoric acid.
  • Bonding ceramic brackets with light-cured composite resin and two resin-modified glass ionomer cements.

Main Results:

  • No significant reduction in bond strength with 2.5% nitric acid compared to 37% phosphoric acid when using composite resin.
  • Resin-modified glass ionomer cements yielded significantly lower bond strengths than composite resin.
  • Less composite resin remained on enamel after bracket removal with nitric acid etching.

Conclusions:

  • 2.5% nitric acid is a viable alternative to 37% phosphoric acid for etching enamel when using composite resin for ceramic bracket bonding.
  • Composite resin provides superior bond strength for ceramic brackets compared to resin-modified glass ionomer cements.
  • Nitric acid etching may facilitate easier cleanup of composite resin post-debonding.

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