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Related Experiment Videos

Bonded molar tubes--an in vitro evaluation.

D T Millett1, S Letters, E Roger

  • 1Unit of Orthodontics, Glasgow Dental Hospital and School, UK. d.t.millett@dental.gla.ac.uk

The Angle Orthodontist
|October 19, 2001
PubMed
Summary

Compomers and resin-modified glass ionomer cements offer viable alternatives to traditional light-cured resin adhesives for bonding molar tubes, demonstrating comparable shear bond strength and survival rates in orthodontic treatments.

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Area of Science:

  • Orthodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Molar tube debonding is a common clinical challenge in orthodontics.
  • Current bonding agents include light-cured resin adhesives, compomers, and resin-modified glass ionomer cements.
  • Evaluating the bond strength and longevity of different agents is crucial for treatment success.

Purpose of the Study:

  • To compare the shear bond strength of molar tubes bonded with compomer, resin-modified glass ionomer cements, and light-cured resin adhesive.
  • To assess the amount of adhesive remaining after debonding.
  • To evaluate the survival time of bonded molar tubes under simulated mechanical fatigue.

Main Methods:

  • 120 extracted human third molars were divided into four groups, each bonded with a different agent: Ultra Band-Lok (compomer), 3M Multi-Cure or Fuji Ortho LC (resin-modified glass ionomer cements), and Transbond (light-cured resin adhesive).

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  • Shear bond strength was measured using a universal testing machine.
  • Adhesive remnant index was used to assess remaining adhesive.
  • Molar tubes underwent simulated mechanical fatigue in a ball mill to determine survival time.

    • Main Results:

    • Transbond showed significantly lower shear bond strength compared to 3M Multi-Cure and Fuji Ortho LC.
    • Ultra Band-Lok had significantly lower shear bond strength than Fuji Ortho LC.
    • Adhesive remnant distribution differed significantly between 3M Multi-Cure and Transbond groups.
    • No significant difference in molar tube survival time was observed among the groups after 50 hours in the ball mill.

    Conclusions:

    • Compomers and resin-modified glass ionomer cements are effective alternatives to light-cured resin adhesives for bonding molar tubes.
    • These alternative materials provide comparable bond strength and longevity, potentially reducing debonding issues in orthodontic treatment.