Dentin microhardness during and after whitening treatments

Patricia Moreira De Freitas, Cecilia Pedroso Turssi, Anderson Hara, Mônica Campos Serra

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Objective: This in vitro study aimed to evaluate the effect of bleaching agents on dentin microhardness during and after bleaching. Method and materials: Specimens were randomly assigned to seven groups (n = 15): Nite White Excel 2 Z [NW] 10% and 22%; Rembrandt [REM] 10% and 22%; Opalescence [OPA] 10% and 20%; and a placebo agent. The 42-day whitening treatment consisted of daily application of the agents to the dentin surfaces for 8 hours, followed by immersion in artificial saliva for 16 hours. After the bleaching treatment, specimens were kept immersed in artificial saliva for 14 days. Microhardness was measured at baseline, 8 hours, and 7, 14, 21, 28, 35, and 42 days of bleaching and during the posttreatment period (7 and 14 days). Results: The analysis of variance for split-plot showed a significant effect on the interaction between bleaching agent and time. Tukey's test and regression analyses revealed that during the bleaching period, the agents NW 10%, NW 22%, and OPA 20%, which did not differ from each other, did not alter dentin microhardness, showing constant microhardness values. There were no differences among REM 10%, REM 22%, and OPA 10%, which showed significant reductions in microhardness after day 14 compared to other agents. After bleaching procedures, there was an increase in dentin microhardness for all groups. Conclusion: Throughout the bleaching treatment, depending on the agent applied, dentin showed a transitory decrease in microhardness values. In the posttreatment period, artificial saliva presented a remineralizing effect on the bleached surfaces.

Original languageEnglish (US)
Pages (from-to)411-417
Number of pages7
JournalQuintessence International
Volume35
Issue number5
StatePublished - May 2004
Externally publishedYes

Fingerprint

Dentin
Bleaching Agents
Artificial Saliva
Therapeutics
Immersion
Analysis of Variance
Placebos
Regression Analysis
Iridescence

Keywords

  • Bleaching
  • Carbamide peroxide
  • Dentin
  • Microhardness
  • Saliva
  • Vital teeth

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Moreira De Freitas, P., Pedroso Turssi, C., Hara, A., & Campos Serra, M. (2004). Dentin microhardness during and after whitening treatments. Quintessence International, 35(5), 411-417.

Dentin microhardness during and after whitening treatments. / Moreira De Freitas, Patricia; Pedroso Turssi, Cecilia; Hara, Anderson; Campos Serra, Mônica.

In: Quintessence International, Vol. 35, No. 5, 05.2004, p. 411-417.

Research output: Contribution to journalArticle

Moreira De Freitas, P, Pedroso Turssi, C, Hara, A & Campos Serra, M 2004, 'Dentin microhardness during and after whitening treatments', Quintessence International, vol. 35, no. 5, pp. 411-417.
Moreira De Freitas P, Pedroso Turssi C, Hara A, Campos Serra M. Dentin microhardness during and after whitening treatments. Quintessence International. 2004 May;35(5):411-417.
Moreira De Freitas, Patricia ; Pedroso Turssi, Cecilia ; Hara, Anderson ; Campos Serra, Mônica. / Dentin microhardness during and after whitening treatments. In: Quintessence International. 2004 ; Vol. 35, No. 5. pp. 411-417.
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