Influence of post-bleaching time intervals on dentin bond strength.
It has been reported that bond strength of resin to tooth structure can be reduced when the bonding procedure is carried out immediately after the bleaching treatment. This study evaluated the effect of bleaching of non-vital teeth bleaching on the shear bond strength (SBS) of composite resin/bovine dentin interface and the influence of delaying the bonding procedures for different time intervals following internal bleaching. According to a randomized block design, composite resin cylinders (Z100/Single bond - 3M) were bonded to the flattened dentin surface of two hundred and fifty-six teeth which had previously been subjected to four different treatments: SPH - sodium perborate + 30% hydrogen peroxide; SPW - sodium perborate + distilled water; CP - 37% carbamide peroxide; and CON - distilled water (control), each one followed by storage in artificial saliva for 0 (baseline), 7, 14, and 21 days after bleaching (n = 16). The bleaching agents in the pulp chambers were replaced every 7 days, over 4 weeks. The SBS test of the blocks was done using a universal testing machine. The ANOVA showed that there was no significant interaction between time and bleaching agents, and that the factor time was not statistically significant (p > 0.05). For the factor bleaching treatment, the Student's t-test showed that [CON = CP] > [SPW = SPH]. The bleaching of non-vital teeth affected the resin/dentin SBS values when sodium perborate mixed with 30% hydrogen peroxide or water was used, independently of the elapsed time following the bleaching treatment.
Department of Restorative Dentistry, School of Dentistry of Piracicaba, Campinas State University.
Erica Cappelletto Nogueira
EC
Teixeira
Cecilia Pedroso
CP
Turssi
Anderson Takeo
AT
Hara
Mônica Campos
MC
Serra
D000704:Analysis of Variance; D000818:Animals; D001881:Borates / Q000494:pharmacology; D000077463:Carbamide Peroxide; D002417:Cattle; D003188:Composite Resins / Q000494:pharmacology; D001840:Dental Bonding; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D004338:Drug Combinations; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D066298:In Vitro Techniques; D010545:Peroxides / Q000494:pharmacology; D013997:Time Factors; D014073:Tooth Bleaching; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology
D001881:Borates; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide; C027707:sodium perborate