The objective of this study was to evaluate the sealing ability and antibacterial activity of Ca3SiO5/CaCl2 composite cement. Fifty maxillary anterior teeth were instrumented according to step-back technique and filled with experimental and control materials. To evaluate the sealing ability, a fluid transport model using glucose was employed for quantitative analysis of endodontic microleakage....

Soft X-ray microscopy is a powerful tool for investigations of, for example, polymers or soils in their natural liquid environment. This requires a wet-specimen chamber. Compact X-ray microscopy allows the horizontal mounting of such samples, thereby reducing the influence of gravitational forces. We have developed a wet-specimen chamber for such compact X-ray microscope. The chamber is vacuum ...

Heard Island is possibly the remotest speck of land on the Earth. It was only in the 18505 that the human race finally reached this most isolated of places. For the next 30 years gangs of hunters established themselves on the isolated beaches of Heard Island to slaughter the wildlife for their oil and furs and ship the products to markets half-way around the globe. The material culture remains ...

The design for a reversible microfluidic coupler is proposed for use with microreactors and other MEMS devices. However, real couplers will include imperfections that must be considered to fully evaluate the degree of sealing. A method is presented for applying a normally distributed surface finish with a predetermined amplitude to a perfectly flat contact surface. The method is then applied to...

For the management of fractured large pores in high-water-bearing reservoirs, general approach is to use transfer dissection and sealing. Conventional regulators have a limited regulating radius can only produce blocking near-well zone, which not ideal. Deep technology expand action substantially improve effect. The existing deep-dissection agent system has problems such as high cost poor effec...

This in vitro study evaluated the effect of different apicoectomy angles, instruments used in root-end preparation, and dental materials used in retrofilling on apical sealing. Root ends were resected at 45 or 90 degrees in 80 single-rooted teeth. For each type of apicoectomy, root-end cavities were prepared with either a round carbide #2 bur or an S12/90D ultrasonic tip. The root-end cavities ...

BACKGROUND Avoidance coping (e.g. sealing over) is common in people recovering from psychosis, but it is not understood why some individuals 'seal over'. AIMS We examined the hypothesis that individuals who 'seal over' do not have the personal resilience to withstand this major life event. METHOD Fifty participants were interviewed during an acute episode of psychosis and reassessed at 3-mo...

It is a well-known fact that inheritance as defined in most existing object-oriented languages breaks encapsulation in a very subtle way. For instance, Java provides facilities for encapsulation both at the class-level and at the packagelevel. But it also introduces language constructs (such as public/ protected modifier and inheritance) that lets clients to access the internals of a class in a...

OBJECTIVES Formaldehyde - a chemical widely used to preserve organic tissues in hospitals - is known to be carcinogenic in the long term and to cause breathing-related symptoms in the short term. We have taken advantage of an experiment to quantify this second effect among hospital workers in terms of probability of showing respiratory symptoms with respect to a benchmark in which tissues are p...

AIM Sealing of pits and fissures is one of the most effective techniques in caries prevention: however incomplete removal of plaque debris, can cause lack of retention of the sealant. MATERIALS AND METHODS Sixty first permanent molars were sealed for this study. The teeth were divided into four groups. All teeth were isolated with a dental dam before cleaning and coronal polishing was perform...