While both fluoroscopic and CT-guidance during cervical nerve root blocks have been well documented in the literature, the use of CT fluoroscopy (CTF) has not. CTF is well suited to provide imaging guidance during these procedures due to its combination of excellent anatomic detail, relatively low radiation dose and the ability to perform an initial dynamic contrast injection, and is a viable a...

We have obtained a 17 μm image of the η Carinae nebula with a signal to noise ratio never reached before. Once deconvolved, the spatial resolution is of the order of 0.5′′. The ring and arclike structures seen at 17 μm are very similar to those observed at 12.5 μm; however the intensity maximum is located elsewhere in a dense cold structure seemingly torus-like around the central object. The hi...

There is overwhelming evidence that endodontic diseases can be characterized as infectious diseases. There is no longer any question that microorganisms are at the center of the etiological causes of pulpal and periradicular pathological processes (1, 2). There are many secondary reasons contributing to tissue breakdown and endodontic failures, such as root perforations, instrument fractures, e...

INTRODUCTION This study was carried out to evaluate the technical quality of root canal treatment (RCT) performed by undergraduate dental students at the Islamic Azad University in Tehran, Iran. MATERIALS AND METHODS Four-hundred records of patients who had received RCT at faculty of dentistry, between the years 2004-2006 were evaluated. For each treated tooth at least three periapical x-rays...

introduction: the aim of this study was to compare the dentine removing efficacy of gates-glidden drills with hand files, protaper and oneshape single-instrument system using cone-beam computed tomography (cbct). methods and materials: a total of 39 extracted bifurcated maxillary first premolars were divided into 3 groups ( n =13) and were prepared using either gates-glidden drills and hand ins...

background and aim: clinical and radiographic diagnoses of dental root fractures have always been difficult and require high accuracy in dental care and treatment. the aim of this study was to compare the diagnostic accuracy of intraoral digital radiography (psp) and cbct in the detection of horizontal root fracture (hrf) and vertical root fracture (vrf). materials and methods: for this experim...

introduction : there is a direct relationship between the quality of root canal obturation and success of endodontic therapy. the aim of the present study was to assess the quality of canal obturation performed by undergraduate dental students at the faculty of dentistry, mashhad university of medical sciences, mashhad, iran. materials and methods: records of 200 endodontically treated teeth fr...

introduction: the aim of this in vitro study was to evaluate the effect of canal dryness on the push-out bond strength of two resin sealers (ah-plus and adseal) and a bioceramic sealer (endosequence bc sealer) after canal irrigation with sodium hypochlorite (naocl) and chlorhexidine (chx). methods and materials: a total of 18 extracted human premolars were used. canals were prepared and were di...