Depletion of water molecules during ethanol wet-bonding with etch and rinse dental adhesives

Effect of simplified ethanol-wet bonding on dentin bonding durability of etchand-rinse adhesives

“…While the simplified version of ethanol-wet bonding technique is certainly a more clinically relevant protocol, water-saturated acid-etched dentin surfaces were saturated with absolute ethanol for 60 s only -unlike the full chemical dehydration protocol which mimics epoxy resin tissue embedding 12,21) . In a study by Gregoire et al, they claimed that treating acid-etched dentin with absolute ethanol twice for 10 s could leave water strongly bound to collagen molecules while excess water was replaced by ethanol prior to adhesive application 23) . However, pulpal pressure was not simulated in their study 23) .…”

“…In a study by Gregoire et al, they claimed that treating acid-etched dentin with absolute ethanol twice for 10 s could leave water strongly bound to collagen molecules while excess water was replaced by ethanol prior to adhesive application 23) . However, pulpal pressure was not simulated in their study 23) . Osorio et al showed that simplified ethanol application (100% ethanol for 60 s) caused collagen fibrils to collapse because of evaporation of water or absolute ethanol 24) .…”

Is the Ethanol Wet-bonding Technique a Promising One?

“…1 and 2). To replace the residual water in the demineralized dentin matrix prior to using adhesives, specific sequences and concentrations of ethanol solutions must be used (Grégoire et al, 2013).…”

Efeito da contaminação por saliva humana na interface adesiva: resistência de união, análise de camada híbrida e conversão de sistemas adesivos

“…De tal forma, os monômeros hidrofílicos não foram capazes de encapsular completamente a matriz de colágeno (aproximadamente 0,5 microns), deixando as fibrilas de colágeno expostas e susceptíveis à biodegradação da rede de colágeno (GREGOIRE et al, 2013). Por outro lado, o efeito do ácido fosfórico ativa as enzimas MMPs, ao remover todos os cristais extra e intrafibrilares, expondo as fibrilas de colágeno MAZZONI et al, 2007;De MUNCK et al, 2009 .…”

“…Independente da procedência da água que atinja a região da interface adesiva, através da própria dentina (água residual ou água presa (POURPOINT et al, 2007;GREGOIRE et al, 2013) no interior do corpo da dentina), de meios externos como infiltração marginal ou pelo ingresso de fluido como a saliva, a sua presença pode contribuir fortemente para o prejuízo da integridade do sistema adesivo a longo prazo TJADERHANE et al, 2013a). Dessa forma, nos grupos SB10% e SB10% e SU25%, apesar de terem obtido uma taxa alta de conversão, não significa necessariamente que a união seja estável e do tipo covalente (NAKAJIMA et al, 2002;PASHLEY et al, 2003).…”