The microstructure of loess mainly reflects the size distribution, orientation, contact mode and pore distribution particles. six original (low clayey silt loess) on same site in Lanzhou is selected by direct shear test, high power electron microscope energy spectrum test. To simulated calculation cohesion (C) internal friction angle (φ), used parameters data, including to mineral element (Fe/A...

the purpose of this study was to evaluate the effect of er:yag laser on the shear bond strength of resin modified glass ionomer (rmgi) to enamel.twenty extracted caries-free human premolars were selected. the teeth were embedded in acrylic resin. the buccal surfaces of each sample were ground to plane enamel with carbonated disc. the teeth were randomly divided in two groups. in the first group...

introduction: the aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. methods: 40 human extracted molars divided into 4 groups (n=10) received the following treatments. group 1: carbide bur, group 2: air abrasion with aluminum oxide 50 μm, group 3: irradiated with erbium-doped yttrium aluminum garnet (er: yag) laser (150 mj/20hz), g...

objective: ceramics have advantages such as optimal esthetics and biocompatibility. however, in the oral environment, they are subjected to high levels of stress due to masticatory forces, saliva, thermal changes and alterations of ph, which increase their risk of fracture. since replacement of these restorations is costly and time-consuming, composite resin is often used for intraoral repair o...

. this paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (frp) composites. a total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. two composite systems namely carbon/epoxy...