Abstract Objective: Endodontically treated teeth with inadequate crown structure need a radicular post to help restore the tooth to proper function. Therefore, finding an efficient and timely method for preparing the post space in a way that causes less change in the amount of apical flood of the canal, has been the subject of various discussions and researches for many years. In this study, ...

In this paper, the effects of quartz fibers on resistivity, complex permittivity, permeability, and S-parameters high-alumina cement pastes are investigated. Meanwhile, change microstructure after adding were analyzed by mercury intrusion porosimetry (MIP) scanning electron microscope (SEM). The results show that with increase content fiber, real part permittivity decreases, while imaginary die...

This study demonstrates the fabrication of κ-carrageenan fibers by a wet-spinning method and discusses three important spinning parameters: coagulation bath composition, spinning rate and post-spinning mechanical drawing. The as-spun fiber diameter decreased with KCl and ethanol concentration in the coagulation bath. In general, the ultimate tensile stress and elongation at break both increased...

SELECTION CRITERIA The authors searched MEDLINE, EMBASE, CENTRAL, and Scopus electronic databases through 2004 for eligible articles. The authors also searched International Association for Dental Research conference proceedings and abstracts from 1996-2004 and contacted manufacturers and other known experts to identify unpublished studies. Studies had to be randomized or quasi-randomized clini...

Research by the National Institute for Occupational Safety and Health (NIOSH) has pursued quartz analysis for the specialized filter assemblies of a new worker-wearable personal dust monitor (PDM). The PDM is a real-time instrument utilizing a tapered element oscillating microbalance (TEOM). Standard fiberglass TEOM filters cannot accommodate the desired P-7 infrared analytical method used by t...

BACKGROUND The purpose of this study was to compare the adaptation of fiber reinforced composite post system and cast post-and-core. METHODS 17 extracted human permanent maxillary central incisors were endodontically treated following the standard protocol. 17 fiber reinforced composite post had been fabricated and adapted to the prepared parallel root canals. A light body poly vinyl siloxane...

We fabricate and characterize carbon-fiber tips for their use in combined scanning tunneling and force microscopy based on piezoelectric quartz tuning fork force sensors. An electrochemical fabrication procedure to etch the tips is used to yield reproducible sub-100-nm apex. We also study electron transport through single-molecule junctions formed by a single octanethiol molecule bonded by the ...

We report on single mode optical transmission of hollow core glass waveguides (HWG) coupled with an external cavity mid-IR quantum cascade lasers (QCLs). The QCL mode results perfectly matched to the hybrid HE(11) waveguide mode and the higher losses TE-like modes have efficiently suppressed by the deposited inner dielectric coating. Optical losses down to 0.44 dB/m and output beam divergence o...

The purpose of this study was to evaluate the time needed to remove several types of fiber posts using two different bur kits. Estimates refer to the time needed to pass the fiber post until arriving at the gutta-percha. Sixty extracted anterior teeth were treated endodontically. A post space with a standard depth of 10 mm was prepared in each root canal. The sample was randomly divided into 3 ...