Effect of a 37% carbamide peroxide bleaching agent activated by halogen light or light emiting diodes (LEDs) on enamel surface roughness microhardness
Efeito de um agente clareador de peróxido de carbamida a 37% ativado por luz halógena ou diodos emissores de luz (LEDs) na rugosidade e microdureza de superfície do esmalte
Bacci, A.C.L.; Flório, F.M.; Basting, R.T.
Rev. odontol. UNESP, vol.36, n4, p.351-355, 2007
Abstract
The purpose of this in vitro study was to evaluate the surface roughness and microhardness of human enamel treated with an in-office dental bleaching agent containing 37% carbamide peroxide – Magic Bleaching/ Vigodent - (CP) activated by either a halogen light (HL) or light emitting diodes (LED). Sixty enamel fragments were randomly divided into 5 groups were treated accordingly: 1) CP; 2) CP+HL; 3) CP+LED; 4) placebo agent (PLA) which contained carbopol and glycerin; 5) saliva (CON). During and after 4 weekly applications, enamel fragments were washed and kept in artificial saliva at 37°C. Surface roughness was determined before and after treatments with a profilometer and cut-off set to 0.08 and microhardness was determined with a Knoop indenter with 25 g. Analysis of variance and Tukey test (p < 0.05) showed significant increase in surface roughness for all groups. There were no statistical significant changes in enamel microhardness after treatment with CP associated or not with light curing units. PLA group had higher roughness and lower microhardness. Irrespective of the treatment, enamel surface roughness was altered and enamel microhardness was unaffected by the experimental treatments. Halogen light curing units or light emitting diodes may be used in combination with in-office dental bleaching without significantly altering the enamel surface roughness and microhardness when compared to a control.
Keywords
Tooth bleaching, dental enamel, hydrogen peroxide
Resumo
O objetivo deste estudo foi avaliar in vitro a rugosidade e a microdureza do esmalte dental humano submetido a um agente clareador de consultório contendo peróxido de carbamida a 37% - Magic Bleaching/ Vigodent (MB) - ativado por luz halógena (LH) ou por diodos emissores de luz (LED). Sessenta fragmentos de esmalte foram divididos aleatoriamente em 5 grupos que receberam diferentes tratamentos: 1) MB; 2) MB + LH; 3) MB + LED; 4) agente placebo (PLA) composto por carbopol + glicerina; e 5) saliva (CON). Durante e após 4 aplicações semanais, os corpos de prova foram lavados, imersos em saliva artificial e mantidos a 37 °C. A rugosidade foi mensurada antes e ao final dos tratamentos com um perfilômetro e cut-off de 0,08 e os testes de microdureza foram realizados com penetrador Knoop e carga de 25 g. A análise de variância e o teste de Tukey (p < 0,05) mostraram aumento significativo na rugosidade superficial para todos os grupos. O grupo que recebeu a aplicação de PLA apresentou maior valor de rugosidade e menor valor de microdureza. Independentemente do método de fotoativação, a rugosidade superficial do esmalte é alterada e a propriedade de microdureza apresenta as mesmas características após a utilização de um agente clareador de consultório contendo peróxido de carbamida a 37%.
Palavras-chave
Clareamento de dente, esmalte dentário, peróxido de hidrogênio
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