This in vitro study aimed to analyze the surface roughness (Ra) and color stability (ΔEab, ΔE00) following simulated mechanical brushing and to evaluate the microtensile (μTBS) of self-adhering resin flowable (SARF) to dentin. The selected materials were Constic, Yflow AS, and Tetric N flow (TNF/control). Thirty composite resin cylinders were fabricated for surface property evaluation. Ra and color were assessed both before and after simulated brushing. The thresholds of 50:50% perceptibility and acceptability of color differences in the evaluated resins were assessed. For μTBS analysis, fifteen molars were selected, sectioned to expose flat dentin surfaces, and restored according to the manufacturers’ instructions for microtensile testing. There were statistically significant differences in Ra among the groups, with Constic exhibiting the highest Ra value (0.702 µm; p < 0.05), whereas Yflow AS presented the lowest Ra value (0.184 µm). No statistically significant difference in color was observed among the groups (p > 0.05). The 50:50% perceptibility and acceptability thresholds were set at 1.2 and 2.7 for ΔEab and 0.8 and 1.8 for ΔE 00. All the results fell within the acceptable limits. The mean μTBS values of Constic, Yflow AS, and TNF were 10.649 MPa, 8.170 MPa, and 33.669 MPa, respectively. This study revealed increased Ra and comparable color stability among all the tested composite resins after abrasion. However, the SARF exhibited lower μTBS compared to conventional using an adhesive system.

This in vitro study aimed to analyze the surface roughness (Ra) and color stability (ΔEab, ΔE00) following simulated mechanical brushing, and to evaluate the microtensile (μTBS) to dentin of Self Adhering Resin Flowable (SARF). The selected materials were Constic, Yflow AS, and Tetric N flow (TNF/control). Thirty composite resin cylinders were fabricated for surface property evaluation. Ra and color were assessed both before and after simulated brushing. The thresholds of 50:50% perceptibility and acceptability of color difference of the evaluated resins were assessed. For μTBS analysis, fifteen molars were selected, sectioned to expose flat dentin surfaces, and restored according to manufacturers' instructions. Subsequently, they were sectioned into sticks for microtensile testing. Statistically significant differences in Ra among the groups, with Constic exhibiting the highest Ra value (p < 0.05), while Yflow AS showed the lowest Ra value. No statistically significant difference in color was observed among the groups (p > 0.05). The 50:50% perceptibility and acceptability thresholds set at 1.2 and 2.7 for ΔEab and 0.8 and 1.8 for ΔE 00. All the results fell within the acceptable limits. The mean μTBS values of Constic, Yflow AS, and TNF were 10.649 MPa, 8.170 MPa, and 33.669 MPa, respectively. The study revealed increased Ra and comparable color stability among all tested composite resins after abrasion. However, SARF exhibited lower μTBS compared to conventional using an adhesive system.

O objetivo do artigo foi avaliar as alterações de cor do esmalte dentário bovino clareado com peróxido de carbamida a 10% contendo diferentes espessantes: Carbopol, Natrosol e Carboximetilcelulose. O preparo dos espécimes foi realizado através do uso de um disco diamantado dupla face com o intuito de se obter corpos de prova com 1mm de espessura de esmalte. Cada amostra foi submetida ao processo de manchamento com chá preto ao longo de seis dias e posterior imersão em saliva artificial para estabilização da cor. Foi realizada a divisão dos grupos e o protocolo clareador foi iniciado durante 14 dias (4h/dia), utilizando peróxido de carbamida a 10% (PC 10%) com Carbopol, e três agentes clareadores manipulados em farmácia: PC 10% com Carbopol, Natrosol e Carboximetilcelulose. A avaliação da estabilidade de cor foi realizada através de um espectrofotômetro digital (Vita EasyShade) após o manchamento, bem como posteriormente ao protocolo clareador. A análise estatística foi realizada pelos seguintes testes: Kruskal Wallis e Mann Whitney (p<0,05). Os resultados revelaram diferenças estatisticamente significantes do PC 10% comercialmente vendido em relação aos parâmetros ΔL, Δa, Δb e ΔE quando comparado aos produtos manipulados em farmácia. Não houve diferença estatística quando comparados os produtos manipulados entre si. Conclui-se que os clareadores manipulados com diferentes espessantes (Carbopol, Natrosol, Carboximetilcelulose) apresentaram eficácia clareadora inferior ao produto já comercializado.