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Ultrasonic activation of internal bleaching agents.

Abstract

AIM
To evaluate the effectiveness of ultrasonic activation of bleaching agents during ex vivo internal bleaching.
METHODOLOGY
Fifty canine human teeth were artificially stained, root filled and divided into five groups (n = 10) that received SP - sodium perborate plus deionized water (control group), CP - 37% carbamide peroxide gel, CPUS - 37% carbamide peroxide gel plus ultrasonic application, HP - 35% hydrogen peroxide gel or HPUS - 35% hydrogen peroxide gel plus ultrasonic application. In groups CP and HP, the bleaching agent was left inside the pulp chamber for three applications of 10 min. In groups CPUS and HPUS, the same process was performed, but ultrasonic vibration was applied to the bleaching agent by an alloy tip for 30 s, with 30 s intervals. Two sessions were performed. The colour was measured initially and after each session by an intraoral dental spectrophotometer. The variation (Δ) of the colour parameters based on the CIELab system L*, a* and b*, and the colour alteration ΔE* were calculated after first and second section. Data were analysed by one-way anova and Tukey's test.
RESULTS
There was no significant difference amongst groups for ΔL*, Δa* and ΔE*, but there was a significant difference for Δb* in the first and second sessions (P = 0.0006 and 0.0016, respectively). After the first session, Δb* was significantly greater for groups HP and HPUS, without a significant difference between them. For the second session, group HPUS had the greatest Δb* values, but they were similar to groups HP and SP; group CP had the lowest values, which were similar to groups CPUS and SP.
CONCLUSION
Ultrasonic activation of bleaching agents during ex vivo internal bleaching was no more effective than conventional internal bleaching procedures, without activation.

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  • Publisher Full Text

    • Authors

    Cardoso M, Martinelli CS, Carvalho CA, Borges AB, Torres CR

    Institution

    Dental Materials and Prosthodontics Department, São José dos Campos Dental School, Unesp, Univ Estadual Paulista, São José dos Campos, SP, Brazil. mayra.cardoso@bol.com.br

    Source

    International endodontic journal 46:1 2013 Jan pg 40-6

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    22788541