Effect of Cariogenic Challenge on the Degradation of Adhesive-Dentin Interfaces

Abstract

<jats:p>Abstract The aim was to evaluate, in vitro, the influence of pH cycling on microtensile bond strength (µTBS) and percentage of nanoleakage (%NL) in the dentin-adhesive interface. Flat dentin surfaces were obtained in 56 extracted third molars. The teeth were randomly divided into four groups (n=14): G1- Single Bond Universal (etch-and-rinse mode); G2- Single Bond Universal (self-etch mode); G3- Scotchbond Multi-Purpose; G4- Clearfil SE Bond. A block of composite was built on the adhesive area. Eight tooth/resin sets were cut parallel to the tooth’s long axis to obtain 48 beams (0.8 mm2) for each group. Half of the beams were submitted to four cycles of pH cycling (demineralizing solution for 6 h and remineralizing solution for 18 h). The samples were submitted to µTBS test in a universal testing machine. Six tooth/resin sets were cut parallel to the tooth’s long axis to obtain three slices of the central region (1.0 mm thickness). Half of the slices were submitted to pH cycling. The nanoleakage methodology was applied to obtain the %NL at the adhesive interfaces. According to two-way ANOVA, the interaction between factors (adhesive system x storage) was significant (p=0.0001) for µTBS and %NL. After pH cycling, there was a significant decrease in µTBS and a significant increase in %NL for all adhesives. The adhesives applied in the self-etch mode obtained lower %NL, differing significantly from the etch-and-rinse adhesives. It was concluded that the pH cycling negatively influenced the µTBS and %NL for all adhesives evaluated. However, self-etch adhesives allowed less %NL.</jats:p>

Comparison of bond strength of universal adhesives using different etching modes: A systematic review and meta-analysis

“…Fifteen only studied dentin's immediate micro-tensile strength 20,[51][52][53][54][55][56][57][58][59][60][61][62][63][64] , and 2 did not obtain detailed dentin micro-tensile strength values 65,66) . Finally, 15 in vitro studies were included and analyzed [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] .…”

Influência de diferentes protocolos de aplicação do sistema adesivo universal na microinfiltração de restaurações Classe V. Estudo in vitro

“…Os resultados deste trabalho podem ser atribuídos ao curto tempo de armazenamento de 24hs no corante (Lawson et al, 2015;Manfroi et al, 2020;Marchesi et al, 2014), a confecção do bisel na margem do preparo cavitário (Patanjali et al, 2019), aplicação ativa do adesivo universal (Loguercio et al, 2011;Pleffken et al, 2011) e habilidade do operador (Shafiei et al, 2021). Marchesi et al (2014) O adesivo universal foi aplicado ativamente na dentina, pois estudos anteriores relataram claramente que o uso ativo desses adesivos autocondicionantes resultam em um melhor desempenho de união (Loguercio et al, 2011;Pleffken et al, 2011).…”

“…compararam o desempenho clínico do adesivo Scotchbond™ Universal Adhesive (3M ESPE, St Paul, MN, EUA) nos modos AC e CT com um adesivo de condicionamento e enxágue (Scotchbond Multi-purpose, 3M ESPE, St Paul, MN, EUA) para restaurar lesões cervicais não cariosas de Classe V. Todos os materiais mostraram um aumento na descoloração marginal ao longo do tempo de avaliação de uma semana e aos 6, 12 e 24 meses. Embora o adesivo universal no modo AC tenha mostrado uma extensão maior de descoloração marginal que os outros materiais aos 24 meses, não houve diferenças significativas entre os materiais em relação à adaptação marginal, cárie secundária ou sensibilidade ao frio Manfroi et al (2020). também não encontraram diferenças significativas na nanoinfiltração de diferentes sistemas adesivos aplicados na dentina após 24h de armazenamento em água destilada.…”