A simple method to increase the bleaching effectiveness of high-concentrated carbamide peroxide used for in-office bleaching.
Int J Esthet Dent. 2019;14(3):324-332.
Abstract
This
in vitro study aimed to evaluate the effect of two alternative clinical
protocols on the tooth bleaching effectiveness of 37% carbamide
peroxide. Thirty enamel-dentin blocks from bovine incisors were stained
with a coffee solution for 1 week. After color measurement at baseline
with a portable spectrophotometer, the blocks were bleached during two
45-min applications of 37% carbamide peroxide with a 2-day interval
between bleaching procedures, according to one of the following
protocols: 1) Control: placement of bleaching agent over dried enamel;
2) Moist enamel: placement of bleaching agent over enamel previously
humidified with a damp gauze for 1 min; 3) Moist cotton pellet: covering
the bleaching agent with a moist cotton pellet during the entire
bleaching procedure. The tooth color was assessed 2 days after each
bleaching procedure. The data of ΔL, Δa, Δb, and ΔE were individually
analyzed using ANOVA and Tukey's test (α = 0.05). In general, applying
the bleaching agent to the moist enamel resulted in lower Δa and Δb
values, and higher ΔL and ΔE values than the control. No difference was
observed between the control and the protocol of covering the bleaching
agent with a moist cotton pellet. Regardless of the protocol, the second
bleaching procedure resulted in a further increase in ΔL and ΔE, and a
reduction in Δa. A further decrease in Δb was observed only for the
moist enamel protocol. In conclusion, humidifying the enamel with a damp
gauze prior to the placement of 37% carbamide peroxide improved the
effectiveness of the bleaching.
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