RESUMEN
This laboratory study compared the flexural endurance limits of clinical combinations of dental composite with and without glass ionomer cement (GIC) liners. Using only composite (Filtek Z350), specimens (10 mm long x 2 mm wide x 2 mm thick) in the control group were produced. Two GICs (Vitremer and Vitrebond) were used with the composite to prepare the test groups. Flexural strength and flexural fatigue limit (FFL) tests were performed. The FFL was determined using the staircase method. Data were analyzed by one-way ANOVA and Tukey's test. There was a significant difference in flexural strength values between the composite-only specimens and those produced by composite and GIC (p < 0.05). No statistical difference was observed in the flexural strength values between composite with Vitremer and composite with Vitrebond (p < 0.05). No statistically significant differences were detected in FFL values between composite with Vitremer and composite with Vitrebond; in addition, the mean value of the composite-only specimens differed statistically from those of both composite with Vitremer and composite with Vitrebond (p < 0.05). The FFL was lower than the flexural strength, indicating a decrease in flexural strength of 45 to 50%. Using GICs with composite decreased the mechanical properties (FFL and flexural strength) of the composite.
Asunto(s)
Resinas Compuestas/química , Recubrimiento de la Cavidad Dental , Materiales Dentales/química , Restauración Dental Permanente , Cementos de Ionómero Vítreo/química , Análisis del Estrés Dental , Humanos , Ensayo de Materiales , Docilidad , Estrés Mecánico , Propiedades de SuperficieRESUMEN
O objetivo deste trabalho foi avaliar o comportamento mecânico à compressão de sete diferentes resinas compostas fotopolimerizáveis: G1- Tetric Ceram (Ivoclar Vivadent); G2- Durafill VS (Heraeus Kulser); G3-Esthet X (Dentsply); G4- Charisma (Heraeus Kulser); G5- Filtek Supreme (3M ESPE); G6- Filtek Z250 (3M ESPE); G7- Filtek P60 (3M ESPE). Foram confeccionados oito corpos-de-prova de cada resina, utilizando matriz de nylon (4mm de diâmetro e 8mm de altura). As resinas foram inseridas em incrementos e fotopolimerizadas pelo tempo recomendado pelos fabricantes (Optilight 600 - Gnatus) com intensidade monitorada...