Effect of charcoal-containing toothpastes on roughness and color stability of bulk-fill resin composites

Vieira-Junior, Waldemir Francisco; Costa, Rafaella Queiróz; Barros, Leonardo Santos; Mori, Mariana Mayume; Turssi, Cecilia Pedroso; França, Fabiana Mantovani Gomes; Pini, Núbia Inocencya Pavesi; Basting, Roberta Tarkany

Objective:

To evaluate the effects of different commercially available charcoal-based toothpastes (CBTs) on the roughness and color of bulk-fill resin composites (RCs).

Materials and Methods:

Disc-shaped samples (6 × 2 mm) were made with nanofilled (NF) bulk-fill (Filtek One, 3M Oral Care) or nanohybrid (NH) bulk-fill (Aura, SDI) RCs. The analyses were performed initially (baseline) and after 10,000 brushing cycles in a tooth-brushing machine using (n=10): regular toothpaste (Colgate Total 12, Colgate-Palmolive) or three types of CBTs (Colgate Luminous White Activated Charcoal - Colgate-Palmolive; Black is White - Curaprox; 3D White Mineral Clean - Oral-B). The specimens were analyzed for roughness (Ra, μm) and quantified by coordinates of the CIEL*a*b* color space, Vita Classical scale (shade guide unit, SGU), and general color alteration (ΔEab; ΔE00). The data were evaluated using generalized linear models (Ra, L*, b*, ΔEab; ΔE00), Mann-Whitney, Kruskal-Wallis, and Dunn tests (a*; ΔSGU), with α=0.05.

Results:

Regardless of the toothpaste, Ra increased after brushing, but was significantly higher in NH than NF (p=0.0001). L* significantly decreased after brushing with Black is White toothpaste (p=0.0027). NF showed higher ΔE00 values after brushing with the CBTs, compared with regular toothpaste. Moreover, NH exposed to Black is White exhibited higher ΔEab and ΔE00 values than the other toothpastes (p<0.0001).

Conclusion:

The roughness alteration was not mediated by the type of toothpaste. However, the CBTs were able to change the optical properties of bulk-fill RCs, with more pronounced effects, as observed with Black is White (AU)

Objetivo:

Avaliar os efeitos de diferentes dentifrícios contendo carvão (DCCs) na rugosidade e cor de resinas compostas (RCs) bulk-fill.

Material e Métodos:

Amostras cilíndricas (6 × 2 mm) foram confeccionadas com as RCs nanoparticulada (NP) bulk-fill (Filtek One, 3M Oral Care) e nano-híbrida (NH) bulk-fill (Aura, SDI).

As análises foram realizadas nos tempos:

inicial (baseline) e após 10000 ciclos de escovação em máquina simuladora utilizando (n = 10): dentifrício regular (Colgate total 12, Colgate-Palmolive) e DCCs (Colgate Luminous White Carvão Ativado - Colgate-Palmolive; Black is White - Curaprox; 3D White Mineral Clean - Oral-B). As amostras foram analisadas quanto à rugosidade (Ra, μm) e quantificadas nas coordenadas do sistema CIEL*a*b*, na escala Vita Classical (SGU), e em valores de alteração geral da cor (ΔEab; ΔE00). Os dados foram avaliados por modelos lineares generalizados (Ra, L*, b*, ΔEab; ΔE00), testes de Mann Whitney, Kruskal-Wallis e Dunn (a*; ΔSGU), com α=0,05.

Resultados:

Independentemente do dentifrício, a Ra aumentou após a escovação, mas com valores significativamente maiores para a NH do que para a NP (p = 0,0001). Os valores de L* diminuíram significativamente (p = 0,0027) após escovação com Black is White. NP mostrou maiores valores de ΔE00 após escovação com os DCCs comparada ao dentifrício regular. Adicionalmente, NH exibiu maiores valores de ΔEab e ΔE00 quando exposta ao dentifrício Black is White comparada aos outros dentifrícios (p < 0,0001).

Conclusão:

A alteração de rugosidade não foi mediada pela tipo de dentifrício. Entretanto, os DCCs foram capazes de alterar as propriedades ópticas das RC bulk-fill, com efeitos mais potencializados com o dentifrício Black is White (AU)