The prevalence of colloid deposition at grain-to-grain contacts in two porous media (spherical glass beads and angular quartz sand, 710-850 microm) was examined using X-ray microtomography (XMT) under conditions where the colloid-grain surface interaction was solely attractive (lacking an energy barrier to deposition), and under fluid velocity conditions representative of engineered filtration ...

objective: the aim of this study was to compare the microtensile bond strengths (μ tbs) of three core materials with one lithium disilicate reinforced ceramic using two resin cements. methods: three core materials (nulite f® (biodental technologies), filtek z250® (3m-espe), prettau-anterior® (zirkonzhan, germany)) were prepared as blocks (10×10×4 mm3) according to the manufacturer’s instruction...

OBJECTIVES The aim of this study was to evaluate the clinical performance of posterior, metal-free polymer crowns with and without a glass-fiber framework, in comparison to metal-ceramic crowns. METHODS After randomisation, 80 single crowns, manufactured from a newly designed polymer composite, were set in posterior teeth. Half of these received a glass-fiber framework, while half were prepar...

ceramic on light transmission of light-emitting diode (LED) and quartz-tungsten-halogen units (QTH) were evaluated. Ceramic IPS e.max CAD shades A1, A2, A3, A3.5, high (HT) and low (LT) translucency were cut (1, 2, 3, 4 and 5 mm). Light sources emission spectra were determined. Light intensity incident and transmitted through each ceramic sample was measured to determine light transmission perc...

Singlet molecular oxygen [1O2 (1Deltag)] is generated cleanly in aqueous solution upon irradiation of a heterogeneous complex, meso-tetra(N-methyl-4-pyridyl)porphine (1) adsorbed onto porous Vycor glass (PVG). The cationic photosensitizer 1 tightly binds onto PVG and gives a stable material, which does not dissociate 1 into the surrounding aqueous phase. The production of 1O2 was measured by mo...

I . Cement-bone interface histology 60 II . Acrylic bone cement and the exotherm 61 III . Radiographic analysis of interfaces in total hip replacement 63 IV. Interface biomechanics in total hip replacement 63 V. Radiographic analysis of interfaces in total knee replacement 65 VI . Interface biomechanics in total knee replacement 65 VII . Biomaterials interface biomechanics 66 VIII . Ceramic/bon...

We report on experimental and numerical studies of steady-state two-phase flow in a quasi twodimensional porous medium. Experimentally, the wetting and the non-wetting phase are injected simultaneously from alternating inlet points into a Hele-Shaw cell containing one layer of randomly distributed glass beads, initially saturated with wetting fluid. Transient behavior is observed in time and sp...

B2O–SiO2 borosilicate glasses in a specific composition range show spinodal-type phase separation by heat-treatment at around those glass transition temperatures, and porous or glass-ceramics can be easily obtained via an acid treatment after the separation. We have studied preparation conditions of SrTiO3-precipitated for photocatalyst hydrogen generation using solar energy. It was found that ...

Two glass ceramics in the CaO--P2O5--MgO system with the incorporation of K2O or TiO2 oxides were prepared with the goal of using them as potential bone graft substitutes. The incorporation of TiO2 and K2O led to the preparation of specific crystalline phases in the structure of the glass ceramics, which show different degrees of biodegradation. In fact, the 45CaO--45P2O5--5MgO--5K2O has been p...