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Related Experiment Videos

Immediate bonding to bleached enamel.

Amal K Nour El-din1, Barbara H Miller, Jason A Griggs

  • 1Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX 75246, USA. ael-din@tambcd.edu

Operative Dentistry
|March 16, 2006
PubMed
Summary

Bleaching enamel with hydrogen peroxide or carbamide peroxide significantly reduces resin-enamel bond strength. This impacts dental bonding procedures, leading to adhesive failures and poor resin infiltration.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • Dental bleaching agents, such as 10% carbamide peroxide and 38% hydrogen peroxide, are widely used.
  • The effect of these bleaching agents on the immediate bond strength of resin composites to enamel is a critical clinical concern.
  • Understanding the interaction between bleached enamel and dental adhesives is essential for predictable clinical outcomes.

Purpose of the Study:

  • To evaluate the shear bond strength, resin infiltration, and failure modes of organic solvent-based adhesives on bleached enamel.
  • To compare the effects of 10% carbamide peroxide and 38% hydrogen peroxide bleaching agents on immediate enamel bonding.
  • To investigate the influence of ethanol-based (Single Bond) and acetone-based (One Step) adhesives on bond durability.

Main Methods:

Related Experiment Videos

  • Seventy-two bovine incisors were divided into control, 38% hydrogen peroxide, and 10% carbamide peroxide groups.
  • Each group was further divided to test ethanol-based (Single Bond) and acetone-based (One Step) adhesives.
  • Shear bond strength testing and scanning electron microscopy (SEM) for fractography and resin tag analysis were performed.

Main Results:

  • Shear bond strengths were significantly lower in both bleached groups (38% hydrogen peroxide and 10% carbamide peroxide) compared to the non-bleached control group.
  • All specimens exhibited an adhesive failure mode.
  • SEM analysis revealed fewer, thinner, and fragmented resin tags in bleached specimens, indicating reduced resin infiltration.

Conclusions:

  • Immediate bonding to enamel pre-treated with 10% carbamide peroxide or 38% hydrogen peroxide results in significantly compromised shear bond strength.
  • The use of organic solvent-based adhesives on bleached enamel leads to reduced resin infiltration and an adhesive failure mode.
  • Clinicians should consider the potential negative impact of recent enamel bleaching on the success of immediate resin composite restorations.