Influência do tratamento de superfície em diferentes substratos na resistência de união à cimento resinoso autoadesivo
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Data
2019-08-27
Autores
Almeida, Cláudia Cristina Miranda de Souza
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
As reabilitações orais com próteses fixas na Odontologia passaram por grande evolução ao serem estabelecidos e firmados os conceitos de adesão química. A alta demanda estética desses tratamentos faz com que as cerâmicas que são materiais altamente biocompatíveis e com ótimas propriedades mecânicas, sejam amplamente utilizadas nas reabilitações orais. Nas próteses sobre implantes, o processo de cimentação de restaurações cerâmicas acontece sobre conexões metálicas em titânio (Ti), cobalto-cromo (CoCr) ou infra-estruturas personalizadas em zircônia (Zr). O processo de cimentação necessita de algumas etapas para promover o tratamento de superfície das restaurações indiretas e variam de acordo com a especificidade de cada substrato. O objetivo deste estudo foi avaliar a influência do tratamento de superfície em diferentes substratos de conexões protéticas utilizando primer e sistema adesivo universal contento o monômero funcional 10-MDP na resistência de união à cimento resinoso autoadesivo, por meio de teste mecânico de cisalhamento. Foram confeccionadas 120 amostras (n= 40 de Ti, CoCr e Zr) as quais foram incluidas em blocos de resina acrílica. As amostras foram subdivididas em 12 grupos (n=10), 3 grupos representam o controle e não tiveram a superfície tratada, os demais grupos tiveram a superfície tratada com primer monocomponente ou sistema adesivo universal contendo 10-MDP. Em seguida foi confeccionado um cilíndro de cimento resinoso (2mm de altura X 2,37mm de diâmetro) com o auxílio de um dispositivo de teflon para mensurar as dimensões exatas. Após 24 horas da confecção dos cilíndros, as amostras foram submetidas ao teste mecânico de cisalhamento em máquina de ensaio universal, a uma velocidade de 0,5mm/min, célula de carga de 100 kgf, até a fratura. Os resultados obtidos foram submetidos a ANOVA e teste Tukey, e demonstraram de uma maneira geral que a aplicação do monômero funcional 10-MDP (10-metacriloiloxidecil dihidrogenio fosfato) presente em primer e adesivo universal testados influenciou positivamente o tratamento de superfície de diferentes substratos utilizados em conexões protéticas, promovendo maior resistência de união ao cimento resinoso autoadesivo em todos os substratos.
Oral rehabilitations with fixed prostheses in Dentistry had grown with great evolution when the concepts of chemical adhesion were established and signed. The high aesthetic demand of these treatments makes Ceramics, that are highly biocompatible materials and with good mechanical properties, widely used in oral rehabilitation. In implant prostheses, the process of cementation happens between ceramic restorations on metallic connections in titanium (Ti) and / or cobalt chromium (CoCr) or custom zirconia (Zr) infrastructures. During the cementing process of ceramic restorations some surface treatment steps are required, these steps varying according to the type of specific ceramics. The aim of this study was to evaluate the influence of surface treatment on different substrates of prosthetic connections using primer and universal adhesive system containing 10-MDP functional monomer on bond strength to self-adhesive resin cement by mechanical shear test. One hundred and twenty samples (n = 40 Ti, CoCr and Zr) were made and included in blocks of acrylic resin. The samples were subdivided into 12 groups (n = 10), 3 groups represent the control and did not have the surface treated, the other groups had the surface treated with single component primer or universal adhesive system containing 10-MDP. Then a resin cement cylinder (2mm height X 2,37mm diameter) was made with the aid of a teflon device to measure the exact dimensions. Twenty four hours after the cylinders were made, the samples were subjected to mechanical shear testing in a universal testing machine at a speed of 0.5mm/min, load cell 100kgf, until fracture. The results were submitted to ANOVA and Tukey test, and showed in general that the application of the 10-MDP functional monomer (10- methacryloyloxydecyl dihydrogen phosphate) present in primer and universal adhesive tested positively influenced the surface treatment of different substrates used in prosthetic connections, promoting greater bond strength to self-adhesive resin cement on all substrates.
Oral rehabilitations with fixed prostheses in Dentistry had grown with great evolution when the concepts of chemical adhesion were established and signed. The high aesthetic demand of these treatments makes Ceramics, that are highly biocompatible materials and with good mechanical properties, widely used in oral rehabilitation. In implant prostheses, the process of cementation happens between ceramic restorations on metallic connections in titanium (Ti) and / or cobalt chromium (CoCr) or custom zirconia (Zr) infrastructures. During the cementing process of ceramic restorations some surface treatment steps are required, these steps varying according to the type of specific ceramics. The aim of this study was to evaluate the influence of surface treatment on different substrates of prosthetic connections using primer and universal adhesive system containing 10-MDP functional monomer on bond strength to self-adhesive resin cement by mechanical shear test. One hundred and twenty samples (n = 40 Ti, CoCr and Zr) were made and included in blocks of acrylic resin. The samples were subdivided into 12 groups (n = 10), 3 groups represent the control and did not have the surface treated, the other groups had the surface treated with single component primer or universal adhesive system containing 10-MDP. Then a resin cement cylinder (2mm height X 2,37mm diameter) was made with the aid of a teflon device to measure the exact dimensions. Twenty four hours after the cylinders were made, the samples were subjected to mechanical shear testing in a universal testing machine at a speed of 0.5mm/min, load cell 100kgf, until fracture. The results were submitted to ANOVA and Tukey test, and showed in general that the application of the 10-MDP functional monomer (10- methacryloyloxydecyl dihydrogen phosphate) present in primer and universal adhesive tested positively influenced the surface treatment of different substrates used in prosthetic connections, promoting greater bond strength to self-adhesive resin cement on all substrates.
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Palavras-chave
Próteses e implantes, Coroas dentárias, Cimentação, Cisalhamento, Prosthodontics and implants, Dental crowns, Cementation, Shear strength