∆u = ∂2u ∂x1 + ∂2u ∂x2 where x = (x1, x2) ∈ IR 2 are Cartesian coordinates. Even though the Poisson equation looks very special it is an important model case representing several problems from physics based on energy minimisation. Variations of the techniques we will study apply to a wide class of second order so-called elliptic problems. It is known that there are cases where no classical (i.e...

the aim of this research was to study the wear behavior of 42crmo4 steel/zro2 composite with 10 and 30 ppi performed ceramic and compare it with the un-reinforced steel under different applied loads. the composite specimens were obtained by pressureless infiltration of the melt into a preformed ceramic of zirconium oxide. the effect of applied load on the specimens wear behavior was studied by ...

OBJECTIVES The purpose of this study was to measure temperature increase induced by various light polymerizing units during resin composite polymerization beneath one of three types of ceramic restorations. METHODS The resin composite (Variolink II) was polymerized between one of three different ceramic specimens (zirconium oxide, lithium disilicate, feldspathic) (diameter 5 mm, height 2 mm) ...

The four lectures follow closely a textbook on Potential Theory in the Complex Plane by T. Ransford, apart from material on harmonic measure which has been borrowed from a lecture course Introduction to Potential Theory with Applications, by C. Kuehn. The material in lecture 5 is borrowed from a survey Logarithmic Potential Theory with Applications to Approximation Theory by E. B. Saff (E-print...

The aim of this study was to investigate the effect of antagonist material and configuration on combined wear, which was produced by alternating toothbrush wear and simulated occlusal wear on one specimen. Worn volume and maximum worn depth comparisons were done using two antagonist materials (steel and ceramic) and two antagonist configurations (flat and round). For the material factor, worn v...

The aims of this study were to investigate the effects of two surface-conditioning methods on the shear bond strength (SBS) of metal brackets bonded to three different all-ceramic materials, and to evaluate the mode of failure after debonding. Twenty feldspathic, 20 fluoro-apatite, and 20 leucite-reinforced ceramic specimens were examined following two surface-conditioning methods: air-particle...

The four lectures follow closely a textbook on Potential Theory in the Complex Plane by T. Ransford, apart from material on harmonic measure which has been borrowed from a lecture course Introduction to Potential Theory with Applications, by C. Kuehn. The material in lecture 5 is borrowed from a survey Logarithmic Potential Theory with Applications to Approximation Theory by E. B. Saff (E-print...

The purpose of this study was to evaluate the microtensile bond strength of a repair composite resin to a leucite-reinforced feldspathic ceramic (Omega 900, VITA) submitted to two surface conditionings methods: 1) etching with hydrofluoric acid + silane application or 2) tribochemical silica coating. The null hypothesis is that both surface treatments can generate similar bond strengths. Ten ce...

In this research study, the effects of aluminum nitride (AlN) additive on the densification behavior and microstructure development of titanium diboride (TiB2) based ceramic matrix composite were investigated. In this way, a monolithic TiB2 ceramic and a TiB2–5 wt% AlN ultrahigh temperature ceramic composite were fabricated by spark plasma sintering (SPS) proces...

Objectives: 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 ...