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Related Experiment Videos

Bond strength to surface enamel for different tooth types.

R S Hobson1, J F McCabe, S D Hogg

  • 1Child Dental Health, Newcastle Dental School, Framlington Place, NE2 4BW, Newcastle upon Tyne, UK. r.s.hobson@ncl.ac.uk

Dental Materials : Official Publication of the Academy of Dental Materials
|February 13, 2001
PubMed
Summary

Tooth type significantly impacts orthodontic bracket bond strength. Lower first molars showed the highest bond strength, while upper first molars had the lowest, affecting treatment reliability.

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Area of Science:

  • Dental Materials Science
  • Orthodontic Engineering
  • Biomaterials

Background:

  • Orthodontic fixed appliance therapy requires robust bracket adhesion to enamel.
  • Bracket debonding presents clinical challenges and increased costs.
  • Factors influencing enamel bond strength across different tooth types remain incompletely understood.

Purpose of the Study:

  • To investigate potential variations in shear bond strength of orthodontic brackets bonded to acid-etched enamel across different human teeth.
  • To establish baseline data on tooth-specific bond strengths for improved orthodontic treatment planning.

Main Methods:

  • Collected 240 extracted human teeth (age 10-22) from Caucasian subjects.
  • Applied standard acid-etch technique with stainless steel brackets and light-cured composite resin.

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  • Measured shear bond strength at 24 hours using an Instron testing machine.

    • Main Results:

    • Tooth type significantly influenced bond strength (p<0.001).
    • Highest mean bond strength observed on lower first molars; lowest on upper first molars.
    • Upper arch: anterior teeth exhibited greater bond strength than posterior teeth (p<0.001).
    • Lower arch: anterior teeth showed weaker bond strength than posterior teeth (p<0.001).

    Conclusions:

    • Findings have significant implications for dental composite bond strength testing and orthodontic treatment reliability.
    • Standardized tooth selection or stratification is crucial for meaningful enamel bond strength comparisons.
    • Variability in clinical bonding efficacy may be partly explained by inherent tooth-specific bond strength differences.