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Branqueamento dentário : avaliação da eficácia de agentes de branqueamento usados em consultório, em ambulatório e em produtos de venda livre
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Abstract(s)
Objetivo: O objetivo deste estudo foi avaliar in vitro a alteração da cor de dentes sujeitos aos agentes de branqueamento usados em consultório, em ambulatório e de venda livre, através da análise da cor por um espectrofotómetro.
Materiais e métodos: Foram selecionados 30 dentes humanos, distribuídos aleatoriamente em 5 grupos (n=6), consoante a método de branqueamento aplicado:
G1 - grupo controlo com placebo; G2 - grupo com gel de branqueamento em consultório com 35% de peróxido de hidrogénio, Perfect Bleach Office +; G3 - grupo com gel de branqueamento em ambulatório com 16% de peróxido de carbamida, Perfect Bleach; G4 - grupo com agente branqueador de venda livre com peróxido de hidrogénio <0,1%, Colgate Max White e G5- grupo com agente branqueador de venda livre sem peróxido de hidrogénio, Iwhite Instant 2. Os dentes foram armazenados em saliva artificial a 37ºC durante o período que mediou a aplicação dos produtos de branqueamento.
No início da investigação, foi medida a cor de todos os dentes dos vários grupos através de um Espectrofotómetro, Spectroshade Micro Optic, segundo o sistema CIE L* a* b*.
Durante o branqueamento, o gel de placebo foi aplicado diariamente durante 12 dias, o gel de peróxido de hidrogénio foi aplicado 1 vez, o gel de peróxido de carbamida foi aplicado diariamente durante 10 dias, o gel Colgate Max White foi aplicado diariamente durante 10 dias e o Iwhite Instant 2 foi aplicado 20 min durante 5 dias consecutivas, de acordo com as instruções dos fabricantes.
Ao fim desse tempo, foram efetuadas novas medições da cor e calculou-se a variação de cor (ΔE*). A análise estatística dos resultados foi realizada através do teste ANOVA com correção Brown-Forsythe (p<0,001) com teste post-hoc Games-Howell.
Resultados: Após o branqueamento, os grupos G2 e G3 registaram um valor médio de ΔE significativamente superior (p<0.001) em relação aos grupos G1, G4 e G5. Além disso, os grupos G2 e G3 apresentam um valor médio de ΔE sem diferença significativa entre si. No grupo G5 observou um valor médio de ΔE* significativamente superior ao grupo G4.
Conclusões: Nos grupos G2 e G3, existem alterações significativas na cor dos dentes pósbranqueamento em relação aos restantes grupos, não apresentando diferenças significativas entre si. Além disso, o grupo G5 apresentou também uma diferença significativa da cor em relação aos grupos G1 e G4. O grupo G1 apresentou diferenças significativas em comparação com os restantes grupos.
Objective: The aim of this study was to evaluate in vitro the change of color of teeth subject to bleaching agents used at office bleaching, at home bleaching and products over-the-counter, through color analysis by a spectrophotometer. Materials and methods: 30 human teeth were selected and randomly distributed into 5 groups (n = 6) depending on the bleaching method applied: G1 - placebo control group; G2 - bleaching gel group with 35% hydrogen peroxide in Perfect Bleach Office + office; G3 - bleaching gel group with 16% carbamide peroxide in Perfect bleach outpatient; G4 - Colgate Max White bleaching agent with hydrogen peroxide <0,1% and G5- Iwhite Instant 2 bleaching agent without hydrogen peroxide. The teeth were stored in artificial saliva at 37 ° C during the period of application of the bleaching products. At the beginning of the investigation, the color of all groups was measured using the Spectrophotometer Spectro Micro Shade, according to the CIE L * a * b * system. During bleaching, the placebo gel was applied daily for 12 days, the hydrogen peroxide gel was applied 1 time, the carbamide peroxide gel was applied daily for 10 days, the Colgate Max White gel was applied twice a day for 10 days and the Iwhite Instant 2 was applied 20 min during 5 consecutive days, according to the manufacturer’s instructions. At the end of this time, the color was measured again and the color variation (ΔE *) was calculated. The results were statistically analyzed using ANOVA test with Brown- Forsythe correction (p <0.001), with test post-hoc Gates-Howell. Results: After bleaching, groups G2 and G3 recorded a significantly higher mean value of ΔE* (p <0.001) compared to groups G1, G4 and G5. In addition, groups G2 and G3 present an almost equal mean value of ΔE* without significant difference. In group G5, there was a significantly higher mean value of ΔE* than group G4. Conclusion: In groups G2 and G3, there are significant changes in the color of the postbleaching teeth compared to the other groups, with no differences between them. In addition, the G5 group also shows a significant difference in color compared to G1 and G4 groups. The G1 group presents significant differences compared to the other groups.
Objective: The aim of this study was to evaluate in vitro the change of color of teeth subject to bleaching agents used at office bleaching, at home bleaching and products over-the-counter, through color analysis by a spectrophotometer. Materials and methods: 30 human teeth were selected and randomly distributed into 5 groups (n = 6) depending on the bleaching method applied: G1 - placebo control group; G2 - bleaching gel group with 35% hydrogen peroxide in Perfect Bleach Office + office; G3 - bleaching gel group with 16% carbamide peroxide in Perfect bleach outpatient; G4 - Colgate Max White bleaching agent with hydrogen peroxide <0,1% and G5- Iwhite Instant 2 bleaching agent without hydrogen peroxide. The teeth were stored in artificial saliva at 37 ° C during the period of application of the bleaching products. At the beginning of the investigation, the color of all groups was measured using the Spectrophotometer Spectro Micro Shade, according to the CIE L * a * b * system. During bleaching, the placebo gel was applied daily for 12 days, the hydrogen peroxide gel was applied 1 time, the carbamide peroxide gel was applied daily for 10 days, the Colgate Max White gel was applied twice a day for 10 days and the Iwhite Instant 2 was applied 20 min during 5 consecutive days, according to the manufacturer’s instructions. At the end of this time, the color was measured again and the color variation (ΔE *) was calculated. The results were statistically analyzed using ANOVA test with Brown- Forsythe correction (p <0.001), with test post-hoc Gates-Howell. Results: After bleaching, groups G2 and G3 recorded a significantly higher mean value of ΔE* (p <0.001) compared to groups G1, G4 and G5. In addition, groups G2 and G3 present an almost equal mean value of ΔE* without significant difference. In group G5, there was a significantly higher mean value of ΔE* than group G4. Conclusion: In groups G2 and G3, there are significant changes in the color of the postbleaching teeth compared to the other groups, with no differences between them. In addition, the G5 group also shows a significant difference in color compared to G1 and G4 groups. The G1 group presents significant differences compared to the other groups.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Branqueamento Peróxido de hidrogénio Peróxido de carbamida Produtos de venda livre Espectrofotómetro