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Abstract(s)
Objetivos: Avaliação da resistência adesiva à dentina por microtração (μTBS) após a aplicação de diferentes formas de ozono e o antioxidante ascorbato de sódio.
Materiais e Métodos: Foram selecionados 25 molares humanos hígidos e distribuídos aleatoriamente por 5 grupos (n=5): CTR (controlo sem ozono), O3_GAS (ozono gasoso), O3_AG (água ozonizada), O3_GAS+AS (ozono gasoso + ascorbato de sódio) e O3_AG+AS (água ozonizada + ascorbato de sódio). Inicialmente foram preparadas cavidades classe I em todas as amostras para expor a dentina. Posteriormente, as cavidades foram expostas a ozono (água e gás) e ascorbato de sódio, de acordo com o
grupo experimental e, em seguida, foi aplicado o sistema adesivo OptibondTM FL (Kerr Corporation, Orange, California, EUA) e restauradas com resina composta HS-20/20 Hybrid Composite (Henry Schein, Nova Iorque, EUA) em incrementos de 2 mm, perfazendo uma altura de 3 mm acima da superfície oclusal. As amostras foram armazenadas durante 24h em água destilada e seccionadas em palitos de 1 mm2 para serem testadas por microtração. A análise estatística foi feita com testes ANOVA one-way e Tukey HSD, com um nível de significância de 5% (R, v.4.2.1).
Resultados: Após análise estatística, verificaram-se diferenças significativas entre o grupo CTR e os grupos de ozono e ozono e ascorbato de sódio (O3_GAS+AS, O3_AG+AS) (p<0,001). No entanto, não se verificaram diferenças significativas entre os grupos de ozono (O3_GAS, O3_AG) e os grupos de ozono e ascorbato de sódio (O3_GAS+AS, O3_AG+AS) (p≥0,05).
Conclusão: A aplicação de ozono e ascorbato de sódio interferem na resistência adesiva à dentina por microtração (μTBS).
Objective: Evaluation of dentin adhesion strength by microtensile bond strength (μTBS) after the application of different forms of ozone and the antioxidant sodium ascorbate. Materials & Methods: 25 healthy human molars were selected and randomly divided into 5 groups (n=5): CTR (control without ozone), O3_GAS (ozone gas), O3_AG (ozonized water), O3_GAS+AS (ozone gas + sodium ascorbate), O3_AG+AS (ozonized water + sodium ascorbate). Initially, class I cavities were prepared in all samples to expose the dentin. Subsequently, the cavities were exposed to ozone (water and gas) and sodium ascorbate, according to the experimental group, and then the OptibondTM FL adhesive system (Kerr Corporation, California, USA) was applied and restored with HS-20/20 Hybrid Composite (Henry Schein, New York, USA) in 2 mm increments, totaling a height of 3 mm above the occlusal surface. The samples were then stored for 24 hours in distilled water and sectioned into 1 mm2 sticks for microtensile testing. Statistical analysis was performed using ANOVA one-way and Tukey HSD tests, with significance level of 5% (R, v.4.2.1). Results: After statistical analysis, there were significant differences between the CTR group and the ozone groups with ozone and sodium ascorbate (O3_GAS+AS, O3_AG+AS) (p<0.001). However, there were no significant differences between the ozone groups (O3_GAS, O3_AG) and the ozone and sodium ascorbate groups (O3_GAS+AS, O3_AG+AS) (p>0.05). Conclusion: The application of ozone and sodium ascorbate interferes with microtensile bond strength (μTBS).
Objective: Evaluation of dentin adhesion strength by microtensile bond strength (μTBS) after the application of different forms of ozone and the antioxidant sodium ascorbate. Materials & Methods: 25 healthy human molars were selected and randomly divided into 5 groups (n=5): CTR (control without ozone), O3_GAS (ozone gas), O3_AG (ozonized water), O3_GAS+AS (ozone gas + sodium ascorbate), O3_AG+AS (ozonized water + sodium ascorbate). Initially, class I cavities were prepared in all samples to expose the dentin. Subsequently, the cavities were exposed to ozone (water and gas) and sodium ascorbate, according to the experimental group, and then the OptibondTM FL adhesive system (Kerr Corporation, California, USA) was applied and restored with HS-20/20 Hybrid Composite (Henry Schein, New York, USA) in 2 mm increments, totaling a height of 3 mm above the occlusal surface. The samples were then stored for 24 hours in distilled water and sectioned into 1 mm2 sticks for microtensile testing. Statistical analysis was performed using ANOVA one-way and Tukey HSD tests, with significance level of 5% (R, v.4.2.1). Results: After statistical analysis, there were significant differences between the CTR group and the ozone groups with ozone and sodium ascorbate (O3_GAS+AS, O3_AG+AS) (p<0.001). However, there were no significant differences between the ozone groups (O3_GAS, O3_AG) and the ozone and sodium ascorbate groups (O3_GAS+AS, O3_AG+AS) (p>0.05). Conclusion: The application of ozone and sodium ascorbate interferes with microtensile bond strength (μTBS).
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Adesão Antioxidante Ozono Resistência à microtração