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Influência de dois agentes antioxidantes na resistência adesiva à dentina de restaurações pré-endodônticas após irrigação com hipoclorito de sódio
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Abstract(s)
Objetivos: Avaliar a influência de dois agentes antioxidantes na resistência adesiva à dentina de restaurações pré-endodônticas sujeitas a irrigação com hipoclorito de sódio.
Materiais e métodos: Foram selecionados 20 molares humanos hígidos. Os dentes foram distribuídos aleatoriamente pelos 4 grupos experimentais: grupo controle (n=5) - amostras irrigadas com água; grupo 1 (n=5) - amostras irrigadas com NaOCl; grupo 2 (n=5) - amostras irrigadas com NaOCl + aplicação de agente antioxidante proantocianidina e grupo 3 (n=5) - amostras irrigadas com NaOCl + aplicação de agente
antioxidante ascorbato de sódio. Foram simuladas restaurações pré-endodônticas com sistema adesivo Optibond FL (Kerr Corporation, Orange, CA, USA) e resina composta Voco GrandioSo (VOCO GmbH, Germany). Simularam-se as aberturas endodônticas e procedeu-se à irrigação com água no grupo controlo e com NaOCl a 1% nos restantes grupos, foram aplicados os agentes antioxidantes proantocianidina e ascorbato de sódio nos grupos 2 e 3, respetivamente. O acesso endodôntico foi restaurado segundo o mesmo
protocolo. As amostras foram seccionadas novamente para obter palitos com uma secção transversal de 1±0,3mm² e testadas em tensão até ocorrer fratura, numa máquina de testes universal. Os resultados foram analisados com recurso a ANOVA one-way. Foi estabelecido um nível de significância de 5% (p≤0,05).
Resultados: Foram identificadas diferenças estatisticamente significativas entre o grupo controlo e o grupo 3 (p<0,001); entre o grupo 1 e o grupo 3 (p=0,013) e entre o grupo 2 e o grupo 3 (p=0,014). Não foram encontradas diferenças estatisticamente significativas entre o grupo controlo e o grupo 1 (p=0,130) e entre o grupo 1 e o grupo 2 (p= 0,999).
Conclusão: O uso de agentes antioxidantes não melhora a resistência adesiva à dentina após irrigação com hipoclorito de sódio. O uso de ascorbato de sódio foi prejudicial à resistência adesiva à dentina após irrigação com hipoclorito de sódio.
Purpose: To evaluate the influence of two antioxidant agents on dentin microtensile bond strength of pre-endodontic restorations after irrigation with sodium hypochlorite. Materials and methods: Twenty healthy human molars were selected. The teeth were randomly distributed in 4 experimental groups: Control group (n=5) - specimens irrigated with water; group 1 (n=5) - specimens irrigated with NaOCl; group 2 (n=5) - specimens irrigated with NaOCl + application of antioxidant agent proanthocyanidin and group 3 (n=5) - specimens irrigated with NaOCl + application of antioxidant agent sodium ascorbate. Pre-endodontic restorations were simulated with Optibond FL (Kerr Corporation, Orange, CA, USA) adhesive system followed by application with Voco GrandioSo (VOCO GmbH, Germany) composite resin. Endodontic access was simulated, and irrigation was performed with water in the control group and with 1% NaOCl in the remaining groups, and the antioxidant agents proanthocyanidin and sodium ascorbate were applied in groups 2 and 3, respectively. The endodontic access was restored according to the same protocol. The samples were again sectioned to obtain beams or sticks with a cross-section of 1±0.3 mm² and tested in tension until fracture in a universal testing machine. The results were analyzed using one-way ANOVA. A significance level of 5% was set (p≤0,05). Results: Statistically significant differences were identified between the control group and group 3 (p<0.001); between group 1 and group 3 (p=0.013) and between group 2 and group 3 (p=0.014). No statistically significant differences were found between the control group and group 1 (p=0.130) and between group 1 and group 2 (p= 0,999). Conclusion: The use of antioxidant agents does not improve dentin bond strength after irrigation with sodium hypochlorite. Using sodium ascorbate significantly decreases dentin bond strength after irrigation with sodium hypochlorite.
Purpose: To evaluate the influence of two antioxidant agents on dentin microtensile bond strength of pre-endodontic restorations after irrigation with sodium hypochlorite. Materials and methods: Twenty healthy human molars were selected. The teeth were randomly distributed in 4 experimental groups: Control group (n=5) - specimens irrigated with water; group 1 (n=5) - specimens irrigated with NaOCl; group 2 (n=5) - specimens irrigated with NaOCl + application of antioxidant agent proanthocyanidin and group 3 (n=5) - specimens irrigated with NaOCl + application of antioxidant agent sodium ascorbate. Pre-endodontic restorations were simulated with Optibond FL (Kerr Corporation, Orange, CA, USA) adhesive system followed by application with Voco GrandioSo (VOCO GmbH, Germany) composite resin. Endodontic access was simulated, and irrigation was performed with water in the control group and with 1% NaOCl in the remaining groups, and the antioxidant agents proanthocyanidin and sodium ascorbate were applied in groups 2 and 3, respectively. The endodontic access was restored according to the same protocol. The samples were again sectioned to obtain beams or sticks with a cross-section of 1±0.3 mm² and tested in tension until fracture in a universal testing machine. The results were analyzed using one-way ANOVA. A significance level of 5% was set (p≤0,05). Results: Statistically significant differences were identified between the control group and group 3 (p<0.001); between group 1 and group 3 (p=0.013) and between group 2 and group 3 (p=0.014). No statistically significant differences were found between the control group and group 1 (p=0.130) and between group 1 and group 2 (p= 0,999). Conclusion: The use of antioxidant agents does not improve dentin bond strength after irrigation with sodium hypochlorite. Using sodium ascorbate significantly decreases dentin bond strength after irrigation with sodium hypochlorite.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Restauração pré-endodôntica Hipoclorito de sódio Resistência adesiva Antioxidante