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document
Eight in-office tooth whitening systems evaluated in vivo : a pilot study . This in vivo pilot study evaluated eight products with hydrogen peroxide ( HP ) concentrations ranging from 15 % to 35 % . The treatment contact time varied from 15 minutes to 60 minutes . Patients were evaluated for color at baseline , immediately after treatment and at one , two , four and six weeks after treatment using a colorimeter , shade guide and photos . All eight products were effective in bleaching teeth . Colorimeter data for deltaE immediately after treatment was 6.77 . At one and six weeks after bleaching , there were 51 % and 65 % reductions in deltaE , respectively .
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Intervention_Physical
Eight in-office tooth whitening systems
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Intervention_Pharmacological
eight products with hydrogen peroxide ( HP ) concentrations ranging from 15 % to 35 % .
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Intervention_Educational
colorimeter , shade guide and photos
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Outcome_Physical
bleaching teeth .
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Outcome_Physical
bleaching
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Outcome_Mental
deltaE