introduction: the purpose of this in vitro study was to compare the accuracy of the new electronic apex locator raypex5 with radiography for working length determination of straight and curved root canals. materials and methods: twenty straight and single canals of maxillary central teeth and twenty curved mesiobuccal canals of mandibular molar teeth were used. access cavities were prepared and...

Proteome scale absolute quantification is fundamental for the quantitative understanding of an organism. The unsatisfactory accuracy for protein abundance estimation of current algorithms has been partially improved by the Absolute Protein EXpression profiling (APEX) algorithm, which implements the prior expectations of peptides' appearances in the calculation of protein abundances. However, th...

A subtrochanteric femur fracture after cannulated screw fixation of a femoral neck fracture is a devastating complication. We hypothesized that an apex-distal screw orientation would tolerate higher loads to subtrochanteric fracture. Human cadaveric femora were instrumented with three cannulated screws in either an apex-distal or an apex-proximal configuration. Specimens were loaded along the m...

OBJECTIVES The purpose of this study was to evaluate the proximity of the mandibular molar apex to the buccal bone surface in order to provide anatomic information for apical surgery. MATERIALS AND METHODS Cone-beam computed tomography (CBCT) images of 127 mandibular first molars and 153 mandibular second molars were analyzed from 160 patients' records. The distance was measured from the bucc...

In this paper, we have studied the hydrogen adsorption onto CNCs and BNNCs nano-cones using GCMC simulations. The effects of length and cone apex angle on adsorption property have been investigated. Our results show that with increasing the pressure and decreasing the cone length and cone apex angle except for CNC-300˚, the hydrogen adsorption onto the BNNCs and CNCs was increased. It was also ...

T HE apex cardiogram was described in 1878 by Marey.' With the exception of its utilization in the timing of the opening snap of the mitral valve 2 3 and in the identification of the third and fourth heart sounds,4-6 it has been used only infrequently as an aid in timing cardiac phenomena. Technical difficulties in its recording have obstructed its more universal application and, more particula...

T HE apex cardiogram was described in 1878 by Marey.' With the exception of its utilization in the timing of the opening snap of the mitral valve 2 3 and in the identification of the third and fourth heart sounds,4-6 it has been used only infrequently as an aid in timing cardiac phenomena. Technical difficulties in its recording have obstructed its more universal application and, more particula...

Introduction: Dental autotransplantation is an economical and viable alternative for the replacement of teeth with closed apex. The use piezoelectric surgery a beneficial tool considered less invasive technique, ideal dental organs. Objective: To analyze literature on using 3D replicas donor teeth, as well prognosis treatment in immature apex complete apex, extraction tooth tissue regeneration ...

background: management of canal isthmus is considered as an important factor for successful endodontic treatment. accordingly, this study was designed to determine the prevalence, location, and types of isthmus in mesial root canals of extracted mandibular molars in a sample of iranian population. materials and methods: in this cross-sectional descriptive study, 60 extracted molars with two mes...

PURPOSE OF REVIEW Visual loss from optic neuropathy and ophthalmoplegia involving multiple cranial nerves are the hallmarks of an orbital apex syndrome. Historically, the terms superior orbital fissure, orbital apex, and cavernous sinus have been used to define the anatomic locations of a disease process. However, the diagnostic evaluation and management is similar for each of these entities. T...