INTRODUCTION To compare the apical extrusion of debris produced during root obturating material removal from severely curved root canals using either Reciproc (REC) or ProTaper Next (PTN) systems. METHODS AND MATERIALS Twenty-six mesial canals of lower molars were instrumented, filled and allocated into two groups (n=13). Micro-computed tomographic images were performed to determine the root ...

Five techniques for delivering ZOE into straight and curved simulated root canals were investigated for their depthof-fill capabilities. The techniques tested were those using the endodontic pressure syringe, the mechanical syringe, the lentuIo spiral, the JiffyTM Tube, and the tuberculin syringe. Statistical analysis revealed that the instruments of choice for filling straight canals were the ...

introduction: this study aimed to compare the efficacy of mtad, glyde and edta in removing the post-preparation smear layer and debris produced in apical third of curved molar root canals. materials and methods: forty extracted human maxillary first molars with curved mesiobuccal canals (30˚-35˚), similar root lengths and morphologies were divided into 3 experimental groups (n=12) and one contr...

In the scope of miniaturized optical sensors for liquid refractometry, this work details the design, numerical simulation, and experimental characterization of a Fabry-Pérot resonator consisting of two deeply-etched silicon cylindrical mirrors with a micro-tube in between holding the liquid analyte under study. The curved surfaces of the tube and the cylindrical mirrors provide three-dimensiona...

We study the flow of an incompressible viscous fluid through a long tube with compliant walls. The flow is governed by a given time-dependent pressure drop between the inlet and the outlet boundary. The pressure drop is assumed to be small, thereby introducing creeping flow in the tube. Stokes equations for incompressible viscous fluid are used to model the flow, and the equations of a curved, ...

The Dirichlet Laplacian in curved tubes of arbitrary constant cross-section rotating together with the Tang frame along a bounded curve in Euclidean spaces of arbitrary dimension is investigated in the limit when the volume of the cross-section diminishes. We show that spectral properties of the Laplacian are in this limit approximated well by those of the sum of the Dirichlet Laplacian in the ...

Dear Editor, A 57-year-old man presented for suspension microlaryngoscopy and biopsy of a laryngeal lesion that was mildly obstructive. After induction of general anaesthesia, a standard midline approach of glideScope laryngoscopy provided good laryngeal exposure. A junior anaesthesiologist made a failed attempt to introduce a 5.0-mm internal diameter cuffed microlaryngeal tracheal (MlT) tube w...

Single-operator real-time ultrasound-guidance to aim and insert a lumbar epidural needle. curved needle set refines ultrasound guided ganglion impar neuro-lysis. Needle echogenicity in sono-graphically guided regional anesthesia: blinded comparison of 4 enhanced needles and validation of visual criteria for evaluation. 'Do as you would be done by': the ethics of using outdated equipment in medi...

The implant described in this communication is the direct descendent of a long series of artificial drainage devices which began when Zorab (I9I2) inserted a silk thread through the limbus in order to drain aqueous into the subconjunctival space in cases of glaucoma (see also Mayou, I9I2). Among the more recently described devices are teflon drainage tubes in man (Richards, I955; Epstein, 1959;...

Due to their compliance and high dexterity, biologically-inspired continuum robots have attracted much interest for applications such as medical surgery, urban search and rescue, de-mining etc. In this paper, we will present an application to medical surgery-colonoscopy by designing a pneumatic-driven flexible robotic manipulator, called ColoBot. The focus of this paper lies in the sensor-based...