Aim. To measure and validate the permeability of pressure changes in correlation to different root filling techniques. Methods. Eighty extracted single-rooted teeth were randomly assigned to one of eight groups of ten teeth. Following standardized instrumentation and irrigation, root canal fillings were performed using either cold lateral condensation, a warm carrier-based gutta-percha obturati...

We measure the quasistatic friction force acting on intruders moving downwards into a granular medium. By utilizing different intruder geometries, we demonstrate that the force acts locally normal to the intruder surface. By altering the hydrostatic loading of grain contacts by a sub-fluidizing airflow through the bed, we demonstrate that the relevant frictional contacts are loaded by gravity r...

OBJECTIVES Impaired endothelial function is associated with risk of cardiovascular events, possibly via increased blood pressure. We aimed to investigate if impaired endothelial function is associated with risk of hypertension and blood pressure progression in a large community-based sample. METHODS In the population-based Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUS...

The baroreflex is a key mechanism involved in the control of arterial pressure (AP) during orthostasis in humans. However, the baroreflex is a closed-loop feedback system, from baroreceptor pressure input to systemic AP, and therefore requires open-loop experiments to identify its system characteristics. The requirement limits our ability to identify baroreflex system characteristics in humans....

Tilt-in-Space Sharon Eve Sonenblum, PhD1,2 & Stephen H. Sprigle, PhD, PT1 1Rehabilitation Engineering and Applied Research Laboratory, Georgia Institute of Technology, Atlanta, GA 2Shepherd Center, Atlanta, GA ABSTRACT The objec)ve of this study was to evaluate the biomechanical responses to )lt in persons with SCI. Changes in blood flow and loading at the ischial tuberosi)es (ITs) across diffe...

Alternative methods for determining the critical micelle concentration (cmc) are investigated using canonical and grand canonical Monte Carlo simulations of a lattice surfactant model. A common measure of the cmc is the "free" (unassociated) surfactant concentration in the presence of micellar aggregates. Many prior simulations of micellizing systems have observed a decrease in the free surfact...

Definition of the contractile state of the myocardium from force, length, and velocity relationships and measurements of ventricular pressure is a continuum mechanics approach that requires a detailed knowledge of the system under consideration or, in the absence of detailed knowledge, the use of suitable conceptual models. In this paper we proposed a simpler, though still rigorous, approach th...

A reversible switching of the easy axis of magnetization for Ni on Cu(001) from in plane to out of plane is found by changing the partial pressure of hydrogen in the gas phase around the sample, allowing even for oscillations of the magnetization direction. A quantitative low-energy electron diffraction study of the diffracted intensity versus electron energy [I(E)] shows that the hydrogen-indu...