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Related Experiment Videos

A comparison of three bracket bases: an in vitro study.

N R Smith1, I R Reynolds

  • 1Department of Orthodontics, Eastman Dental Hospital, London.

British Journal of Orthodontics
|February 1, 1991
PubMed
Summary

Orthodontic bracket base design significantly impacts bond strength. Fine mesh bases offer superior tensile bond strength compared to coarse mesh and undercut designs, crucial for effective orthodontic treatment.

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Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Dental Materials

Background:

  • Orthodontic bracket debonding is a clinical concern.
  • Bracket base design influences bond strength and clinical outcomes.
  • Evaluating different base designs is essential for improving orthodontic treatment efficacy.

Purpose of the Study:

  • To compare the mean tensile bond strength of orthodontic brackets with different base designs.
  • To assess the impact of mesh characteristics (coarse vs. fine) and undercut features on bond strength.
  • To determine the optimal bracket base design for enhanced bond durability in orthodontic applications.

Main Methods:

  • Tensile bond strength testing of three orthodontic bracket base types: coarse mesh, fine mesh, and undercut.
  • Sub-division of coarse mesh bases into rough, smooth, and defective groups for detailed analysis.
  • Bonding of brackets to plastic cylinders using composite resin and testing to failure on a universal testing machine.

Main Results:

  • No significant difference in bond strength was observed among the rough, smooth, and defective coarse mesh groups.
  • Fine mesh bracket bases demonstrated significantly higher mean tensile bond strength than coarse mesh bases.
  • Both fine and coarse mesh bases exhibited significantly superior bond strength compared to undercut bases.

Conclusions:

  • Microscopic variations in coarse mesh bases do not significantly affect tensile bond strength.
  • Fine mesh bracket bases provide superior mechanical retention and bond strength in orthodontic applications.
  • Undercut bases are less effective in achieving durable bonds compared to mesh-based designs, highlighting the importance of surface texturing for bracket retention.

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