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Related Experiment Videos

Can previously bleached teeth be bonded safely using self-etching primer systems?

Tancan Uysal1, Ayca Sisman

  • 1Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey. tancanuysal@yahoo.com

The Angle Orthodontist
|February 28, 2008
PubMed
Summary

Bleaching enamel immediately before bracket bonding significantly reduces bond strength. Waiting 30 days after bleaching to bond improves bond strength compared to immediate bonding, but not as much as unbleached enamel.

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Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...

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Area of Science:

  • Dental Materials Science
  • Orthodontic Adhesion
  • Enamel Surface Treatment

Background:

  • Dental bleaching agents can affect the mechanical properties of enamel.
  • The interaction between bleaching agents and orthodontic bonding systems requires further investigation.

Purpose of the Study:

  • To evaluate the effect of carbamide peroxide bleaching on the shear bond strength of orthodontic brackets.
  • To determine if the timing of bleaching relative to bracket bonding influences bond strength and failure site.

Main Methods:

  • Human premolar teeth were divided into three groups: no bleaching, bleaching immediately before bonding, and bleaching 30 days before bonding.
  • Brackets were bonded using Transbond Plus Self-etching Primer.
  • Shear bond strength (MPa) and Adhesive Remnant Index (ARI) scores were measured.

Related Experiment Videos

Main Results:

  • Immediate bleaching significantly reduced shear bond strength compared to unbleached enamel (11.45 MPa vs. 17.60 MPa).
  • Bleaching 30 days prior to bonding resulted in higher bond strength (13.95 MPa) than immediate bleaching, but lower than unbleached enamel.
  • Failure modes differed significantly, with immediate bleaching showing more adhesive failures.

Conclusions:

  • Carbamide peroxide bleaching immediately before bracket bonding compromises the bond strength of self-etching primer systems.
  • A 30-day interval between bleaching and bonding may mitigate some of the negative effects on bond strength.