OBJECTIVE The accuracies of intraoral radiography (IOR), multidetector helical computerized tomography (MDHCT) at slice thicknesses 0.63 mm and 1.25 mm, and limited cone-beam computerized tomography (LCBCT) were compared for detection of horizontal tooth root fracture. STUDY DESIGN In 7 beagle dogs, 28 maxillary anterior teeth were used, of which 13 had artificially induced horizontal root fr...

Patients with left-neglect bisect horizontal lines to the right of true center. Their bisection bias is affected by line length, so that longer lines are bisected further to the right. Patients often crossover and bisect very short lines to the left of true center. We tested the hypothesis that the context in which lines are apprehended accounts for the crossover phenomenon. We replicated previ...

worldwide networks of seismic recording instruments mostly record only translational ground motion in two or three orthogonal directions. rotational component of earthquake is not commonly recorded. several theories are available to estimate a torsional component from recorded translational components of ground motion. in this paper detailed investigations are made to study the relative perform...

BACKGROUND AND AIMS This study aimed to establish soft tissue cephalometric standards in Iranian adults based on NHP, which can be used in diagnosis of orthodontic and orthognathic patients. MATERIALS AND METHODS A group of 46 individuals (24 males and 22 females) with normal occlusion and proportional facial profile were chosen from a large group of dental students. For the all of the chosen...

BACKGROUND There is common belief among some medical researchers that if a potential surrogate endpoint is highly correlated with a true endpoint, then a positive (or negative) difference in potential surrogate endpoints between randomization groups would imply a positive (or negative) difference in unobserved true endpoints between randomization groups. We investigate this belief when the pote...

We present a new application of the acousto-optic superlattice modulation of a fiber Bragg grating based on the dynamic phase and group delay properties of this fiber-optic component. We demonstrate a tunable photonic true-time-delay line based on the group delay change of the light reflected from the grating sidebands. The delay is electrically tuned by adjusting the voltage applied to a piezo...

In order to perceive stereoscopic depth, the visual system must define binocular disparities. Consider an oblique line seen through an aperture formed by flanking occluders. Because the line is perceived behind the aperture, the line must have disparity relative to the aperture. What is the assigned disparity of the line in this aperture problem? To answer this question five observers adjusted ...

Subjects with left hemispatial neglect frequently demonstrate an array of abnormal behaviours on line bisection tasks. They misbisect long horizontal lines to the right of true midline. They bisect short lines to the left of true midline. They exaggerate the left-sided length of lines when placing the endpoints for 'invisible' lines, and they underestimate the length of the left side of long li...