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Related Experiment Videos

Composite resin bond strength after enamel bleaching

F García-Godoy1, W W Dodge, M Donohue

  • 1Department of Restorative Dentistry, University of Texas, Health Science Center at San Antonio 78284-7888.

Operative Dentistry
|July 1, 1993
PubMed
Summary

Enamel bleaching significantly reduces composite resin bond strength, especially after 24 hours of treatment. This impacts dental restoration durability and clinical outcomes.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Dental bleaching agents are widely used for aesthetic improvements.
  • The interaction between bleaching agents and dental restorative materials requires thorough investigation.
  • Understanding the impact of bleaching on bond strength is crucial for clinical success.

Purpose of the Study:

  • To evaluate the effect of a commercial enamel bleaching product on the shear bond strength of composite resin.
  • To compare the bond strength of composite resins after different durations of enamel bleaching.

Main Methods:

  • 45 human molars were prepared with flat enamel surfaces.
  • Teeth were divided into three groups: control (etching only), 1-hour bleaching, and 24-hour bleaching.

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  • Composite resin bond strength was assessed using shear testing after thermocycling.

    • Main Results:

    • Mean shear bond strengths (MPa) were: Group 1 (control): 12.86, Group 2 (1-hour bleach): 12.33, Group 3 (24-hour bleach): 7.67.
    • Groups 1 and 2 showed significantly higher bond strength than Group 3 (P < 0.001).
    • Enamel fracture rates decreased with longer bleaching times (53% in Group 1, 33% in Group 2, 0% in Group 3).

    Conclusions:

    • Enamel bleaching for 24 hours significantly reduces the shear bond strength of composite resins.
    • Shorter bleaching durations (1 hour) did not significantly affect bond strength compared to the control group.
    • Clinicians should consider the potential impact of prolonged bleaching on the longevity of composite restorations.