the microleakage of cinaally amalgam, manufactured by dr faghihi co. which is a high copper alloy and fine-cut amalgam was evaluated by radioisotope agents. the microleakage of cinaally amalgam was compared with sybraloy amalgam, manufactured by sybron/kerr co. which is a high copper alloy and spherical shape amalgam and is known as a standard amalgam alloy. the results showed that there is no ...

Coating materials with special surface wettability are widely applied in marine paint systems used the naval industry to reduce corrosion and viscous drag of seawater. However, traditional coatings inefficient limited, either by poor durability or insufficient anti-drag capacity. Here, inspired diving bell spider, a bionic superhydrophobic coating multiscale hierarchical architecture was succes...

background and aim: an important criterion for success assessment of implant-supported prostheses is marginal fit. vertical and horizontal discrepancy can result in loosening of the prosthetic screw, crestal bone resorption, peri-implantitis and loss of osseointegration. despite careful attention to waxing, investing, and casting, marginal discrepancies are inevitable. the aim of this study was...

the microstructure of hp stainless steel in aged and aged + solution annealed conditions and solutionized alloy 800 was characterized by optical microscopy, scanning electron microscopy (sem), and transmission electron microscopy (tem) equipped by eds. all phases present in the above condition were described. the effects of solution annealing heat treatment temperature on the microstructure, te...

Thermal stability and the kinetics of the grain growth of nano-crystalline Mg-6Al-1Zn-1Si alloy prepared via mechanical alloying (MA) were investigated. It started with elemental powders, using a variety of analytical techniques including differential scanning calorimetry (DSC), X-ray diffraction method (XRD), and scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (E...

To the Editor: A recent article in PNAS by Asikainen and Werle (1) reports on the occurrence and morphology of ferromanganese nodules found in a New Hampshire lake. The authors offer data on the shapes, banding, composition, and distribution of the nodules and crusts. They also state that my paper (2) claims that the morphology of such nodules is controlled by elemental concentrations and that ...