• Comparación in vitro de la microrugosidad superficial del ionómero convencional versus el ionómero modificado con resina sometidos a una gaseosa efervescente

      Hermoza Novoa, Mónica Mercedes; ; Saavedra Cabada, Yourghet Beghonia (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 01/01/2016)
      Objective: The aim of this study was to evaluate the effect of Coca-Cola® on the surface roughness of conventional glass ionomer (Ketac™ Molar Easymix) versus resin modified glass ionomer cement (Ketac™ N100, Fuji II LC). Materials and methods: 10 samples for each glass ionomer cement were prepared using a brass mold of inner diameter 4mm x 2mm thickness. In group I: Ketac™ N100, group II: Fuji II LC and group III: Ketac molar Easymix. The surface roughness test was performed before and after to exposure the samples in Coca-Cola® through the rugosimeter. The samples of each group were immersed in 25ml of Coca-Cola® for 5 minutes, 1 time a day. After every inmersion, all the samples were placed in 25 ml of distilled water at 37 °C. This regimen was followed for 2 weeks. The ANOVA test was used to find and analyzed the results. Results: An initial average de 0.29μm ± 0.17μm, 0.19μm ± 0.07μm and 0.63μm ± 0.25μm; and a final average of 0.31μm ± 0.19μm, 0.23μm ± 0.08μm y 0.88μm ± 0.34μm for Ketac™ N100, Fuji II LC and Ketac™ Molar Easymix respectively. In addition, no statistically significant differences were found when comparing the initial and final surface roughness in each glass ionomer cement. However, when comparing the three ionomers statistically significant differences (p=0.000) were seen. Conclusion: The resin-modified glass ionomer cement Ketac™ N100 had the lowest Surface roughness. However Fuji II LC showed a similar behavior and can be a good alternative of treatment.
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    • Resistencia adhesiva y padrón de fractura en esmalte bovino de un sistema adhesivo de grabado ácido total versus un adhesivo universal

      Correa Medina, Alberth; Cárdenas Valdivia, Nora Cristhina (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 01/01/2016)
      Purpose: The aim of this study was to compared in vitro the microtensile bond strength in enamel of bovine incisor using a self etching adhesive (Single Bond ™ Universal) versus total etch adhesive (Adper ™ Single Bond 2) and evaluate the failure mode. Materials and Methods: This was an experimental study in vitro. Forty bovine incisors were used, being divided into two groups according to the adhesive type to be applied, G1 (Conventional Adhesive – Adper™ Single Bond), and G2 (Universal Adhesive – Single Bond™ Universal). Previously the teeth were disinfected, the pulp chamber being removed. For each group the buccal surface was prepared with water sandpaper and only in the G1 group phosphoric acid at 37% was placed. The adhesive for each group was then applied, as directed by the manufacturer, and a 4mm block of photoactive composite resin (3M ESPE Filtek™ Z350 XT) was placed in each bovine incisor. After 24 hours, these teeth were taken to a cutting machine for samples, in a little stick form, to test the bond strength, which was performed using a universal testing machine (INSTRON®). After the test of microtensile bond, the samples were taken to the optical microscope to watch the incidence of failure mode. Results: The values obtained for bond strength were measured in Mpa; G1 (Conventional Adhesive – Adper™ Single Bond), group was 14.24 ± 5.09 and group G2 (Universal Adhesive – Single Bond™ Universal) was 10.40 ± 3.74 Comparing the bond strength statistically significant differences were found (p=0.002). The most common failure type was the mixed in fractures generated by the testing test. Conclusions: The total etch adhesive (Adper™ Single Bond 2) had a higher bond strength than self etch adhesive (Universal Single Bond™) in enamel of bovine incisors. Also mixed group was the highest result in the failure mode.
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