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Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial

Revista Portuguesa de Estomatologia Medicina Dentária e Cirurgia Maxilofacial | 2021 | 62 (3) | Page(s) 141-149

Original research

In-office tooth bleaching effectiveness with different soft-tissue barriers – randomized controlled trial

Eficácia do branqueamento em consultório com diferentes barreiras de tecidos moles – ensaio clínico aleatorizado

a Oral Biology and Biochemistry Research Group – Faculty of Dental Medicine, Universidade de Lisboa, Lisboa, Portugal
b LIBPhys-FCT UID/FIS/04559/2013, Faculty of Dental Medicine, Universidade de Lisboa, Lisboa, Portugal
c Evidence Based Dentistry Research Center, Cochrane Portugal, Lisboa, Portugal
Duarte Marques -

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Volume - 62
Issue - 3
Original research
Pages - 141-149
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Received on 16/02/2021
Accepted on 12/06/2021
Available Online on 04/07/2021

Objectives: To evaluate the tooth bleaching effectiveness of a 6% hydrogen peroxide paint-on varnish with two different types of soft-tissue protection materials. Methods: Twenty patients were screened according to inclusion and exclusion criteria, submitted to professional dental prophylaxis, and randomly allocated to one of the two groups. An in-office bleaching technique protocol was performed (VivaStyle Paint On PIus, lvoclar- Vivadent®, Liechtenstein) with two different soft-tissue protection materials: Group 1 – Vaseline; Group 2 – block-out resin. Bleaching effectiveness was evaluated with ΔE00 and ΔWID, calculated from the CIE L*a*b* values obtained by spectrophotometry analysis (SpectroShade). Appropriate statistical tests were performed to analyze intragroup differences in CIE L*a*b* and WID values and intergroup differences in ΔE00 and ΔWID with α=0.05. Results: Both groups presented statistically significant (P<0.01) differences in CIE L*a*b* and WID. Both ΔE00 and ΔWID surpassed the acceptability threshold (ΔE00 > 1.8; ΔWID > 2.60), and the ΔWID was mostly classified as hardly acceptable differences. Group 2 presented higher statistically significant (P<0.01) mean values with ΔE00 = 3.5 ± 1.5 and ΔWID = 8.6 ± 4.2. Conclusions: The 6% hydrogen peroxide paint-on varnish tooth bleaching technique showed clinical effectiveness. However, effectiveness varied with the soft-tissue protection material used, with better results when applying a block-out resin, thus suggesting its clinical recommendation.

Objetivos: Avaliar a eficácia do branqueamento dentário de técnica in-office paint-on com peróxido de hidrogénio a 6% com dois tipos diferentes de materiais de isolamento relativo. Métodos: Vinte pacientes foram selecionados de acordo com os critérios de inclusão e exclusão, submetidos a profilaxia dentária profissional e alocados aleatoriamente num de dois grupos. Foi realizado o protocolo de técnica de branqueamento in-office (VivaStyle Paint On PIus, lvoclarVivadent®, Liechtenstein) com dois materiais de isolamento relativo: Grupo 1 – Vaselina; Grupo 2 – resina block-out. A eficácia de branqueamento foi avaliada com ΔE00 e ΔWID, calculados a partir dos valores CIE L*a*b* obtidos por análise espectrofotométrica (SpectroShade). Testes estatísticos apropriados foram realizados para analisar diferenças intragrupo nos valores CIE L*a*b* e WID e diferenças intergrupo em ΔE00 e ΔWID com α=0,05. Resultados: Ambos os grupos apresentaram diferenças estatisticamente significativas (P<0,01) no CIE L*a*b* e WID. Tanto ΔE00 quanto ΔWID ultrapassaram o limite de aceitabilidade (ΔE00 >1,8; ΔWID > 2,60). O Grupo 2 apresentou valores médios estatisticamente significantes superiores (P<0,01) com ΔE00 = 3,5 ± 1,5 e ΔWID = 8,6 ± 4,2. Conclusões: A técnica de branqueamento dentário in-office do tipo paint-on a 6% peróxido de hidrogénio apresentou eficácia clínica, porém dependente do material de isolamento, com melhores resultados na aplicação de resina block-out, sugerindo a sua recomendação clínica.

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