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Ethanol wet bonding : estado da arte
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| 23.23 MB | Adobe PDF |
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Advisor(s)
Abstract(s)
A adesão de materiais restauradores tem sido um campo em constante desenvolvimento
na Medicina Dentária. O problema da adesão duradoura e previsível ao substrato dentinário é considerado como um dos grandes desafios nesta área.
A degradação hidrolítica, a incompleta infiltração de monómeros do adesivo, e a acção
das metaloproteínases endógenas da dentina têm sido descritos como as razões principais para a deterioração da interface adesiva.
Existia na literatura publicada a necessidade de se compilar a evidência científica existente sobre a técnica ethanol wet bonding, uma das soluções para este problema, que tem merecido algum destaque pelas potencialidades que tem demonstrado nos resultados dos estudos in vivo e in vitro.
A técnica ethanol wet bonding permite alterar quimicamente o substracto dentinário, ao
substituir a água do water wet bonding tradicional, por etanol. Este facto permite que as
fibras de colagénio se mantenham suspensas, permitindo a infiltração de monómeros, ao mesmo tempo que as desidrata, prevenindo fenómenos de degradação hidrolítica.
A seguinte revisão bibliográfica procurou compilar informação publicada sob a forma de
artigos científicos sobre a técnica de ethanol wet bonding, e respectivas vantagens e
limitações clínicas. São também abordados os sistemas adesivos contemporâneos, os
principais mecanismos de degradação da adesão e respectivas estratégias para prevenir a sua degradação.
The adhesion of restorative materials has been a constantly developing field in dentistry. The problem of durable and predictable adhesion to the dentin substrate is considered as one of the major challenges in this area of knowledge. Hydrolytic degradation, incomplete monomer infiltration of the adhesive, and the action of endogenous dentin MMPs, have been described as one of the main reasons for the interface deterioration. Thus, there was a need to compile the existing scientific evidence in the published literature on the ethanol wet bonding technique, one of the solutions to this problem, which has deserved some attention due to its potential evidenced in the results of in vivo and in vitro studies. The ethanol wet bonding technique allows to chemically alter the dentin substrate by replacing traditional water wet bonding, with ethanol. This allows the collagen fibers to remain suspended, allowing the infiltration of monomers at the same time as they dehydrate, preventing phenomena of hydrolytic degradation. The following literature review sought to compile published information in the form of scientific papers on the ethanol wet bonding technique and their clinical advantages and limitations. Contemporary adhesive systems, the main degradation mechanisms of adhesion and respective strategies to prevent their degradation are also discussed.
The adhesion of restorative materials has been a constantly developing field in dentistry. The problem of durable and predictable adhesion to the dentin substrate is considered as one of the major challenges in this area of knowledge. Hydrolytic degradation, incomplete monomer infiltration of the adhesive, and the action of endogenous dentin MMPs, have been described as one of the main reasons for the interface deterioration. Thus, there was a need to compile the existing scientific evidence in the published literature on the ethanol wet bonding technique, one of the solutions to this problem, which has deserved some attention due to its potential evidenced in the results of in vivo and in vitro studies. The ethanol wet bonding technique allows to chemically alter the dentin substrate by replacing traditional water wet bonding, with ethanol. This allows the collagen fibers to remain suspended, allowing the infiltration of monomers at the same time as they dehydrate, preventing phenomena of hydrolytic degradation. The following literature review sought to compile published information in the form of scientific papers on the ethanol wet bonding technique and their clinical advantages and limitations. Contemporary adhesive systems, the main degradation mechanisms of adhesion and respective strategies to prevent their degradation are also discussed.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Ethanol wet bonding Dentin Enamel Wet bonding Etch and rinse Dentin bonding Hybrid layer Hydrophobic resin