Shear bond strength after dentin bleaching with 10% carbamide peroxide agents.
This in vitro study evaluated the shear bond strength (SBS) of dentin treated with two 10% carbamide peroxide bleaching agents 15 days after bleaching and storage in artificial saliva. Dentin fragments were randomly divided into 3 groups (n = 20) for the treatment with the two different bleaching agents (Rembrandt 10% or Opalescence 10%) or with a placebo agent, applied to the tooth surface for 8 hours a day. During the remaining time, the specimens were stored in artificial saliva. After 42 days, the fragments were stored in artificial saliva for 14 days. Another group (n = 20) was exposed to distilled and deionized water for 56 days. An adhesive system and microhybrid composite resin were used to prepare specimens for the SBS test. SBS tests were performed and the fractured surfaces were visually examined using a stereoscope at 30 x magnification. The analysis of variance (ANOVA) and SIDAK tests showed higher SBS values for dentin treated with Opalescence 10% than for dentin treated with Rembrandt 10% or placebo. Groups treated with Rembrandt 10%, Opalescence 10% or placebo did not differ from the group treated with distilled and deionized water. Ten percent carbamide peroxide agents or a placebo agent caused no differences in SBS of dentin after 15 days of storage in artificial saliva.
Department of Restorative Dentistry, Dental Research Center of São Leopoldo Mandic.
Roberta Tarkany
RT
Basting
Patrícia Moreira de
PM
Freitas
Luiz André Freire
LA
Pimenta
Mônica Campos
MC
Serra
D000704:Analysis of Variance; D000077463:Carbamide Peroxide; D019245:Compressive Strength; D003804:Dentin / Q000187:drug effects*; D004338:Drug Combinations; D016877:Oxidants / Q000494:pharmacology*; D010545:Peroxides / Q000494:pharmacology*; D010919:Placebos; D011145:Polyvinyls / Q000494:pharmacology; D012464:Saliva, Artificial; D033081:Shear Strength; D014073:Tooth Bleaching / Q000009:adverse effects*; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology*
D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D010919:Placebos; D011145:Polyvinyls; C112939:Rembrandt Lighten; D012464:Saliva, Artificial; C093177:tooth-bleaching agent, Opalescence; D000077463:Carbamide Peroxide; D014508:Urea