Examinando por Materia "Microhíbrida"

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    Fracture resistance of microhybrid resins compared to nanohybrid resins: in vitro study, Lima, Peru 2019
    (Universidad Privada Norbert Wiener, 2019-11-09) Mamani Jáuregui, Marisol Fiorela; Girano Castaños, Jorge Alberto
    Introduction: Nowadays, composite resin restorations are a daily part of dental care, requiring not only excellent aesthetic results but also high fracture resistance under occlusal loads. Objective: To compare the fracture resistance of microhybrid resins and nanohybrid resins. Methodology: Two types of composite resins were used, molded into cylindrical shapes with dimensions of 10 mm in height and 4 mm in diameter. These cylinders were constructed in 2 mm increments, with each increment photo-cured for 20 seconds at 800 nw, and the final layer photo-cured for 40 seconds at 800 nw. The sample size was determined through statistical calculations, comprising 14 resin cylinders of each type. The cylinders were subjected to compression using a universal testing machine, which applied a compressive force at a rate of 0.75 mm/min ± 0.25 mm/min until the resin cylinders fractured. Data were processed using SPSS and analyzed with the Mann-Whitney U test. Results: The fracture resistance of the microhybrid resin was 262.69 ± 42.656 MPa, while that of the nanohybrid resin was 219.45 ± 27.887 MPa. Comparing the two materials revealed that the microhybrid resin had significantly higher fracture resistance than the nanohybrid resin, with a difference of 43.24 MPa (p<0.05). Conclusion: Microhybrid resins exhibit greater fracture resistance compared to nanohybrid resins.