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Resistência adesiva à dentina por microtração de um sistema adesivo self-etch de baixo custo após envelhecimento de 6 meses
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Objetivos: Avaliar in vitro a resistência adesiva à dentina por microtração de um sistema adesivo self-etch de baixo custo (OliEtch Bond, Olident, Podleze, Polónia), em comparação com um sistema adesivo universal já estabelecido (Scotchbond™ Universal Plus, 3M ESPE, St Paul, MN, EUA), após envelhecimento de 6 meses.
Materiais e métodos: Vinte molares humanos hígidos, extraídos há menos de seis meses limpos e desinfetados foram distribuídos aleatoriamente por dois grupos experimentais (n = 10) de acordo com o sistema adesivo utilizado: grupo controlo SBU (ScotchbondTM Universal Plus, 3M ESPE, St Paul, MN, EUA) e grupo experimental OEB (OliEtch Bond, Olident, Podleze, Polónia).
Uma smear layer padronizada foi criada na dentina oclusal. Ambos os adesivos foram aplicados em modo de condicionamento seletivo do esmalte e as restaurações realizadas com resina composta Filtek™ Z250. Os espécimes foram armazenados em saliva artificial a 37 °C durante 6 meses. Posteriormente, palitos de 1 ± 0,4 mm² foram submetidos a testes de microtração numa máquina de testes universal (1 kN; 0,5 mm/min). Os tipos de falha foram classificados em adesivas, coesivas ou mistas. O valor médio por dente foi utilizado como unidade experimental e os dados foram analisados no SPSS através de estatística descritiva e inferencial, recorrendo ao teste t de Student para amostras independentes (α = 0.05). As interfaces adesivas de dois palitos por grupo foram analisadas por MEV.
Resultados: Observaram-se diferenças estatisticamente significativas na resistência adesiva à dentina por microtração entre os dois grupos (p < 0,05), com valores médios de 20,57 ± 5,00 MPa para o SBU e 14,13 ± 5,19 MPa para o OEB. A falha adesiva foi a mais prevalente em ambos os grupos e a análise por MEV demonstrou uma diferença morfológica entre os dois grupos.
Conclusões: Após envelhecimento de 6 meses, o sistema adesivo universal SBU demonstrou uma resistência adesiva à dentina significativamente superior ao sistema de baixo custo OEB.
Objectives: To evaluate in vitro the microtensile bond strength to dentin of a low-cost self-etch adhesive system (OliEtch Bond, Olident, Podleze, Poland) compared to an established universal adhesive (Scotchbond™ Universal Plus, 3M ESPE, St Paul, MN, USA) after 6 months of aging. Materials and methods: Twenty sound human molars extracted less than six months prior, cleaned and disinfected, were randomly assigned to two experimental groups (n=10) according to the adhesive system used: control group SBU (Scotchbond™ Universal Plus, 3M ESPE, St Paul, MN, USA) and experimental group OEB (OliEtch Bond, Olident, Podleze, Poland). A standardized smear layer was created on the occlusal dentin. Both adhesives were applied in selective enamel etching mode and restorations were performed with Filtek™ Z250 composite resin in 2 mm increments up to a total height of 6 mm, each individually light-cured. Specimens were stored in artificial saliva at 37°C for 6 months. Subesquently, sticks of 1 ± 0.4 mm² were submitted to microtensile testing on a universal testing machine (1 kN; 0.5 mm/min); failure modes were classified by stereomicroscopy as adhesive, cohesive or mixed. The mean value per tooth was used as the experimental unit and data were analyzed in SPSS using descriptive and inferential statistics with an independent Student's t-test (α = 0.05). The adhesive interfaces of two sticks per group were analyzed by SEM. Results: Statistically significant differences in microtensile bond strength to dentin were observed between the two groups (t-test; p < 0.05), with mean values of 20.57 ± 5.00 MPa for SBU and 14.13 ± 5.19 MPa for OEB. Adhesive failure was the most prevalent mode in both groups. SEM analysis demonstrated a morphological difference between the two groups. Conclusions: After 6 months of aging, the universal adhesive system SBU demonstrated significantly higher dentin bond strength than the low-cost system OEB, reinforcing the importance of selecting adhesive systems based on scientific evidence of efficacy and durability.
Objectives: To evaluate in vitro the microtensile bond strength to dentin of a low-cost self-etch adhesive system (OliEtch Bond, Olident, Podleze, Poland) compared to an established universal adhesive (Scotchbond™ Universal Plus, 3M ESPE, St Paul, MN, USA) after 6 months of aging. Materials and methods: Twenty sound human molars extracted less than six months prior, cleaned and disinfected, were randomly assigned to two experimental groups (n=10) according to the adhesive system used: control group SBU (Scotchbond™ Universal Plus, 3M ESPE, St Paul, MN, USA) and experimental group OEB (OliEtch Bond, Olident, Podleze, Poland). A standardized smear layer was created on the occlusal dentin. Both adhesives were applied in selective enamel etching mode and restorations were performed with Filtek™ Z250 composite resin in 2 mm increments up to a total height of 6 mm, each individually light-cured. Specimens were stored in artificial saliva at 37°C for 6 months. Subesquently, sticks of 1 ± 0.4 mm² were submitted to microtensile testing on a universal testing machine (1 kN; 0.5 mm/min); failure modes were classified by stereomicroscopy as adhesive, cohesive or mixed. The mean value per tooth was used as the experimental unit and data were analyzed in SPSS using descriptive and inferential statistics with an independent Student's t-test (α = 0.05). The adhesive interfaces of two sticks per group were analyzed by SEM. Results: Statistically significant differences in microtensile bond strength to dentin were observed between the two groups (t-test; p < 0.05), with mean values of 20.57 ± 5.00 MPa for SBU and 14.13 ± 5.19 MPa for OEB. Adhesive failure was the most prevalent mode in both groups. SEM analysis demonstrated a morphological difference between the two groups. Conclusions: After 6 months of aging, the universal adhesive system SBU demonstrated significantly higher dentin bond strength than the low-cost system OEB, reinforcing the importance of selecting adhesive systems based on scientific evidence of efficacy and durability.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Adesão Adesivos universais Dentina Microtração