Bonding stability of adhesive systems to eroded dentin

Abstract

This in vitro study evaluated the immediate and 6 months microshear bond strength (µSBS) of different adhesive systems to sound and eroded dentin. Sixty bovine incisors were embedded in acrylic resin and ground to obtain flat buccal dentin surfaces. Specimens were randomly allocated into two groups: sound dentin (immersion in artificial saliva) and eroded dentin (erosive challenge following a pH cycling model comprising 4 ×/day Sprite Light® drink for 10 days). Then, specimens were reassigned according to the adhesive system: etch-and-rinse adhesive (Adper Single Bond), two-step self-etch system (Clearfil SE Bond), or one-step self-etch adhesive (Adper Easy One). Polyethylene tubes with an internal diameter of 0.76 mm were placed over pre-treated dentin and filled with resin composite (Z250). Half of the specimens were evaluated by the µSBS test after 24 h, and the other half 6 months later, after water storage at 37 °C. Failure mode was evaluated using a stereomicroscope (400 ×). Data were analyzed by three-way repeated measures analysis of variance and Tukey's post hoc tests (α = 0.05). After 6 months of water aging, marked reductions in µSBS values were observed, irrespective of the substrate. The µSBS values for eroded dentin were lower than those obtained for sound dentin. No difference in bonding effectiveness was observed among adhesive systems. For all groups, adhesive/mixed failure was observed. In conclusion, eroded dentin compromises the bonding quality of adhesive systems over time.

Influence of Erosive and Abrasive Cycling on Bonding of Different Adhesive Systems to Enamel: An In situ Study

“…Etched enamel surface provides increasing of available area for adhesion, through providing microporosities which facilitates penetration of adhesive, promoting a mechanically adhesion of resin polymerized to enamel (23). Cruz et al (24) found that there is no difference in bonding effectiveness in eroded bovine enamel among adhesive systems Adper Single Bond 2 and Clearfil SE Bond, when phosphoric acid was used, which is in accordance to the results from the present study.…”

Análise in vitro da resistência de união da resina composta contendo biomaterial S-PRG(Ionômero de Vidro com Superfície Pré-Ativada) à dentina erodida

“…A natureza ácida dos agentes de erosão também pode ativar as metaloproteinases, contribuindo para a degradação enzimática do substrato ao longo do tempo (Buzalaf et al,2012). Estas diferenças entre a dentina hígida e erodida podem ter interferido nas propriedades de adesão dos materiais de restauradores avaliados (Cruz et al, 2012;Zimmerli et al, 2012;Ramos et al, 2015;Cruz et al, 2015;Franciscone-dos-Rios, et al, 2015). Aparentemente, a desorganização das fibrilas colágenas da dentina amolecida e desmineralizada não é modificada pelo pré-tratamento por erosão ácida e prejudica a infiltração dos monómeros, dificultando assim a formação de uma camada híbrida adequada (Cruz et al, 2012;Zimmerli et al, 2012;Ramos et al, 2015;Cruz et al, 2015).…”

“…Estas diferenças entre a dentina hígida e erodida podem ter interferido nas propriedades de adesão dos materiais de restauradores avaliados (Cruz et al, 2012;Zimmerli et al, 2012;Ramos et al, 2015;Cruz et al, 2015;Franciscone-dos-Rios, et al, 2015). Aparentemente, a desorganização das fibrilas colágenas da dentina amolecida e desmineralizada não é modificada pelo pré-tratamento por erosão ácida e prejudica a infiltração dos monómeros, dificultando assim a formação de uma camada híbrida adequada (Cruz et al, 2012;Zimmerli et al, 2012;Ramos et al, 2015;Cruz et al, 2015). Outra possível explicação é que a estrutura morfológica alterada da dentina erodida apresenta mais porosidades que comprometem a evaporação de componentes hidrofílicos, resultando em força de adesão inferior (Wang et al,2004;Lussi et al, 2011;Zimmerli et al, 2012).…”

How 10-MDP functional phosphate monomer and 2% digluconate chlorhexidine solution interact on sound, artificial carious or eroded dentin substrates

“…Both demineralized substrates can affect their interaction with the different restorative systems (CRUZ et al, 2015, FRANCISCONI et al, 2015a, FRANCISCONI et al, 2015b. Therefore, studies…”

“…Both demineralized substrates can affect their interaction with the different restorative systems 1,2,16,17,18 . Therefore, studies reported that the dental substrate, mainly dentin is the most challenging 1,2,3,4 .…”