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Related Experiment Videos

An optimized synthetic substrate for orthodontic bond strength testing.

A Klocke1, D Tadic, B Kahl-Nieke

  • 1Department of Orthodontics, University Hospital Hamburg-Eppendorf, Martinistr. 52, D-20246, Hamburg, Germany. klocke@uke.uni-hamburg.de

Dental Materials : Official Publication of the Academy of Dental Materials
|September 27, 2003
PubMed
Summary

Hot pressed and sintered carbonated hydroxyapatite shows promise as a biomimetic enamel model for orthodontic bond strength testing, offering acceptable shear bond strength values.

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Area of Science:

  • Biomaterials Science
  • Dental Materials

Background:

  • Orthodontic bond strength testing requires reliable biomimetic enamel surface models.
  • Synthetic calcium phosphate substrates offer potential as alternatives to natural enamel.

Purpose of the Study:

  • To evaluate synthetic calcium phosphate substrates for biomimetic enamel surface modeling.
  • To assess their suitability for orthodontic bond strength testing.

Main Methods:

  • Preparation of carbonated apatite, amorphous calcium phosphate, and commercial hydroxyapatite substrates.
  • Testing shear bond strength using a universal testing machine.
  • Evaluation of substrate fracture patterns post-debonding.

Main Results:

  • Hydroxyapatite and amorphous calcium phosphate substrates showed intra-substrate fractures.

Related Experiment Videos

  • Carbonated hydroxyapatite pressed at 300°C yielded a mean bond strength of 7.38 MPa.
  • Sintered carbonated hydroxyapatite (300°C + 600°C) achieved a higher mean bond strength of 9.55 MPa.
  • NaF treatment reduced bond strength to 6.52 MPa.

    • Conclusions:

    • Hot pressed and sintered carbonated hydroxyapatite demonstrated acceptable shear bond strength.
    • These substrates may serve as suitable biomimetic models for orthodontic bond strength evaluation.