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Resistência adesiva à dentina por microtração de um sistema adesivo self-etch de baixo custo
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Abstract(s)
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.
Materiais e métodos: 20 molares humanos extraídos há menos de seis meses, após limpeza e desinfecção, foram seccionados para exposição da dentina, sendo posteriormente simulada a smear-layer. Os dentes foram distribuídos aleatoriamente em dois grupos experimentais (n = 10), de acordo com o sistema adesivo utilizado: grupo controlo SBU (Scotchbond™ Universal Plus - 3M ESPE) e grupo experimental OEB (OliEtch Bond - Olident) aplicados de acordo com as instruções do fabricante. Em seguida foram colocados incrementos de 2 mm de resina composta até atingir 6 mm de altura, sendo estes fotopolimerizados de acordo com as instruções do fabricante. Os dentes foram armazenados em saliva artificial a 37 ºC durante 24 h e, em seguida, seccionados para obtenção de palitos 1 ± 0,4 mm². Estes foram submetidos a testes de microtração numa máquina de testes universal (1 kN; 0,5 mm/min). O valor médio por dente foi considerado como unidade experimental. Os dados foram analisados no programa SPSS através de uma análise estatística descritiva e inferencial com teste t de Student (α = 0,05). As falhas foram classificadas como adesivas, coesivas ou mistas por análise microscópica e a interface adesiva foi observada com o microscópio eletrónico de varrimento.
Resultados: Não se observaram diferenças estatisticamente significativas na resistência adesiva à dentina por microtração entre os dois adesivos universais (t-teste; p > 0,05). A falha adesiva foi a mais prevalente em ambos os grupos e a microscopia permitiu observar uma grande similaridade na morfologia da interface adesiva entre os dois adesivos.
Conclusões: Ambos os sistemas adesivos apresentaram um comportamento similar na adesão à dentina às 24 h.
Objectives: To evaluate in vitro the dentin bond strength by microtensile testing of a low-cost self-etch adhesive system (OliEtch Bond, Olident, Podleze, Poland), in comparison with an already established universal adhesive system. Materials and methods: Twenty human molars extracted within the last six months, after cleaning and disinfection, were sectioned to expose dentin, followed by smear-layer simulation. The teeth were randomly assigned to two experimental groups (n= 10) according to the adhesive system used: control group SBU (Scotchbond™ Universal Plus – 3M ESPE) and experimental group OEB (OliEtch Bond – Olident), both applied according to the manufacturer’s instructions. Composite resin was then placed in 2 mm increments up to a total height of 6 mm, each increment light-cured according to the manufacturer’s instructions. The teeth were stored in artificial saliva at 37 °C for 24 h and subsequently sectioned to obtain sticks of 1 ± 0.4 mm². These were subjected to microtensile bond strength testing in a universal testing machine (1 kN; 0.5 mm/min). The mean value per tooth was considered as the experimental unit. Data were analyzed with SPSS using descriptive and inferential statistics with Student’s t-test (α = 0.05). Failure modes were classified as adhesive, cohesive, or mixed by microscopic analysis, and the adhesive interface was examined under a scanning electron microscope. Results: No statistically significant differences in dentin microtensile bond strength were observed between the two universal adhesives (t-test; p > 0.05). Adhesive failure was the most prevalent in both groups, and microscopy revealed a high similarity in the morphology of the adhesive interface between the two adhesives. Conclusions: Both adhesive systems showed similar bonding performance to dentin at 24 h.
Objectives: To evaluate in vitro the dentin bond strength by microtensile testing of a low-cost self-etch adhesive system (OliEtch Bond, Olident, Podleze, Poland), in comparison with an already established universal adhesive system. Materials and methods: Twenty human molars extracted within the last six months, after cleaning and disinfection, were sectioned to expose dentin, followed by smear-layer simulation. The teeth were randomly assigned to two experimental groups (n= 10) according to the adhesive system used: control group SBU (Scotchbond™ Universal Plus – 3M ESPE) and experimental group OEB (OliEtch Bond – Olident), both applied according to the manufacturer’s instructions. Composite resin was then placed in 2 mm increments up to a total height of 6 mm, each increment light-cured according to the manufacturer’s instructions. The teeth were stored in artificial saliva at 37 °C for 24 h and subsequently sectioned to obtain sticks of 1 ± 0.4 mm². These were subjected to microtensile bond strength testing in a universal testing machine (1 kN; 0.5 mm/min). The mean value per tooth was considered as the experimental unit. Data were analyzed with SPSS using descriptive and inferential statistics with Student’s t-test (α = 0.05). Failure modes were classified as adhesive, cohesive, or mixed by microscopic analysis, and the adhesive interface was examined under a scanning electron microscope. Results: No statistically significant differences in dentin microtensile bond strength were observed between the two universal adhesives (t-test; p > 0.05). Adhesive failure was the most prevalent in both groups, and microscopy revealed a high similarity in the morphology of the adhesive interface between the two adhesives. Conclusions: Both adhesive systems showed similar bonding performance to dentin at 24 h.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Adesão Adesivos universais Dentina Microtração