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A comparison of shear bond strengths on bleached and unbleached bovine enamel
Andrew M Dietrich1, Jeryl English, Kathleen McGrory
1The University of Texas Dental Branch at Houston, Department of Orthodontics, USA.
Introduction:
This study investigated whether tooth whitening with two different bleaching systems affects the shear bond strength achieved using an orthodontic self-etching primer.
Methods:
The sample of 210 bovine incisors was divided into three groups. One group served as the control, while the other two groups received either an over-the-counter "white strip" bleaching regimen (Opalescence TresWhite) or a "power bleaching" in-office regimen (Opalescence Boost). Each bleaching group was divided into three groups to be tested at three time intervals post-bleaching: immediately, 24 hours, and 7 days.
Results:
When compared to the control, the shear bond strength attained on Opalescence TresWhite treated specimens was not significantly lower at any time interval post-bleaching. Immediately after bleaching and 24 hours after bleaching, the Opalescence Boost treated groups showed significantly lower shear bond strengths than both the control groups and the Opalescence TresWhite groups.
Conclusions:
Bleaching with 38 percent hydrogen peroxide immediately and 24 hours before bonding reduced the shear bond strengths. After seven days the bond strengths were normal. Bleaching with 10 percent hydrogen peroxide in the form of white strip material did not reduce shear bond strengths.
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