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Estudo in vitro da resistência adesiva à dentina utilizando um adesivo universal com a estratégia selective dentin etching após envelhecimento
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Abstract(s)
Objetivos: Avaliar in vitro a resistência adesiva à dentina, por microtração (¿TBS), aplicando o Optibond# Universal® com uma estratégia adesiva selective dentin etching e em várias camadas, após 6 meses de envelhecimento em saliva artificial e avaliar a interface adesiva através da microscopia eletrónica de varrimento (MEV).
Materiais e métodos: Foram distribuídos aleatoriamente trinta molares definitivos hígidos humanos, previamente preparados, por 3 grupos experimentais (n = 10): Grupo SE (controlo) - Optibond# Universalç (self-etch); Grupo SD1 - Optibond# Universalç (selective dentin etching); e Grupo SDE3 - Optibond# Universalç (selective dentin etching com três aplicações de camadas de adesivo). Primeiramente, cortou-se o
dente expondo a dentina superficial, simulando de seguida a smear layer, para aplicação do sistema adesivo e da resina composta, de acordo com o protocolo de cada grupo experimental. As amostras foram armazenadas em saliva artificial a pH 6,3 a 37 ºC durante 6 meses. Após o envelhecimento, os dentes foram seccionados em palitos de 1 mm2, sendo submetidos ao ¿TBS numa máquina de testes universal (1 kN; 0,5 mm/min).
Foram observadas as superfícies de fratura num estereomicroscópio e registado o tipo de falha. Os dados foram analisados estatisticamente com os testes ANOVA one-way com Tukey (! = 0,05). Um palito por grupo foi selecionado aleatoriamente para observação no MEV.
Resultados: Não se observaram diferenças estatisticamente significativas (p > 0,05) entre os valores de resistência adesiva dos três grupos experimentais. A maioria das falhas foram adesivas. As imagens do MEV demonstraram uma formação de prolongamentos mais extensos e numerosos nos grupos SDE1 e SDE3.
Conclusões: A resistência adesiva à dentina do Optibond# Universal® não foi influenciada pela estratégia adesiva selective dentin etching após 6 meses de envelhecimento.
Objectives: Evaluate in vitro the microtensile bond strength (¿TBS) to dentin using Optibond# Universal® with the selective dentin etching adhesive strategy with various layers after 6 months in artificial saliva and evaluate the adhesive interface using scanning electron microscopy (SEM). Materials and methods: Thirty sound permanent human molars, previously prepared, were randomly distributed into three experimental groups (n = 10): Group SE (control) - Optibond# Universalç (self-etch); Group SD1 - Optibond# Universalç (selective dentin etching); and Group SDE3 - Optibond# Universalç (selective dentin etching with three adhesive layers applied). Initially, the tooth was cut to expose the superficial dentin, followed by simulating the smear layer for the application of the adhesive system and composite resin, according to the protocol of each experimental group. The samples were stored in artificial saliva at pH 6.3 at 37 °C, aging for 6 months. After aging, the teeth were sectioned into 1 mm² sticks and subjected to ¿TBS in a universal testing machine (1 kN; 0.5 mm/min). The fracture surfaces were observed under a stereomicroscope, and the type of failure was recorded. The data were statistically analyzed using one-way ANOVA with Tukey9s test (! = 0.05). One beam per group was randomly selected for SEM observation. Results: No statistically significant differences (p > 0.05) were observed between the microtensile bond strength values of the three experimental groups. Most of the failures were adhesive. SEM images showed more extensive and numerous resin tags in the SDE1 and SDE3 groups. Conclusions: The bond strength of Optibond# Universal® to dentin was not influenced by the selective dentin etching adhesive strategy after 6 months of aging.
Objectives: Evaluate in vitro the microtensile bond strength (¿TBS) to dentin using Optibond# Universal® with the selective dentin etching adhesive strategy with various layers after 6 months in artificial saliva and evaluate the adhesive interface using scanning electron microscopy (SEM). Materials and methods: Thirty sound permanent human molars, previously prepared, were randomly distributed into three experimental groups (n = 10): Group SE (control) - Optibond# Universalç (self-etch); Group SD1 - Optibond# Universalç (selective dentin etching); and Group SDE3 - Optibond# Universalç (selective dentin etching with three adhesive layers applied). Initially, the tooth was cut to expose the superficial dentin, followed by simulating the smear layer for the application of the adhesive system and composite resin, according to the protocol of each experimental group. The samples were stored in artificial saliva at pH 6.3 at 37 °C, aging for 6 months. After aging, the teeth were sectioned into 1 mm² sticks and subjected to ¿TBS in a universal testing machine (1 kN; 0.5 mm/min). The fracture surfaces were observed under a stereomicroscope, and the type of failure was recorded. The data were statistically analyzed using one-way ANOVA with Tukey9s test (! = 0.05). One beam per group was randomly selected for SEM observation. Results: No statistically significant differences (p > 0.05) were observed between the microtensile bond strength values of the three experimental groups. Most of the failures were adhesive. SEM images showed more extensive and numerous resin tags in the SDE1 and SDE3 groups. Conclusions: The bond strength of Optibond# Universal® to dentin was not influenced by the selective dentin etching adhesive strategy after 6 months of aging.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Adesivo universal Resistência adesiva Selective dentin etching Envelhecimento