Search results for "cavity"
showing 10 items of 641 documents
Hysteroscopy for Uterine Cavity Assessment in Infertility
2020
Abstract Hysteroscopy is a surgical procedure that allows a direct view of the uterine cavity and the tubular ostium. This procedure can be performed for both diagnostic and curative purposes. Hysteroscopy have several indications including the evaluation of abnormal uterine bleeding, infertility or intrauterine tumours identified by ultrasound. The purpose of this paper is to evaluate the correlation between the diagnosis at admission and the intraoperative aspect of the uterine cavity following the hysteroscopic evaluation. We evaluated the patients admitted to the Obstetrics and Gynaecology Clinic of the Sibiu County Emergency Clinical Hospital during 1.01.2019-07.06.2019 who had the fol…
Root Canal Morphology and Configuration of the Mandibular Canine: A Systematic Review
2021
The aim of this study was to systematically review the root canal morphology and configuration (RCC) of mandibular canines (MaCa). The review was registered in the PROSPERO database (ID-272297) and it was carried out following the PRISMA guidelines. Three electronic databases (MEDLINE via PubMed, Embase, Scopus) were searched. Randomized controlled trials, cross-sectional, cohort, comparative, evaluation and validation studies have been included. The anatomical quality assessment (AQUA) tool was used for a quality assessment of the anatomical studies. Of 910 studies retrieved from the systematic search, 28 studies investigating RCCs were included. Most MaCa were single-rooted (87.9–100%), w…
Hemangiopericytoma: A cause of recurrent epistaxis
2020
Hemangiopericytoma is a soft tissue tumor with histological variability and unpredictable clinical and biological behavior. this disease is uncommon in the head and neck and the growth pattern is unspecific; thus, diagnosis is often made by exclusion. A 43-year-old woman presented with a story of recurrent epistaxis associated to a growing mass in the paranasal sinus and a paraneoplastic syndrome. the imaging revealed an hypervascular tumor in the right nasal cavity and obliteration of all the ipsilateral sinus cavities. after biopsy the lesion was removed with resolution of epistaxis and paraneoplastic syndrome. There has been no evidence of disease recurrence in 3 years of follow-up. Our …
Chronic otitis caused by heterotopic brain tissue in pterygopalatine fossa
2007
Summary Heterotopic brain tissue is a rare is congenital anomaly, it may present at any age but it is frequently in infancy. This anomaly can occur most frequently in nasal region, although rests elsewhere in the digestive tract, in facial tissue or in lungs have been reported. Heterotopic brain tissue has been defined as a mass composed of mature brain tissue, outside the cranial cavity or spinal canal. We present a 9 years old girl with history of left chronic otitis and nasal obstruction caused by heterotopic brain tissue in pterygopalatine fossa.
Vacuum energy densities of a field in a cavity with a mobile boundary
2015
We consider the zero-point field fluctuations, and the related field energy densities, inside a one-dimensional and a three-dimensional cavity with a mobile wall. The mechanical degrees of freedom of the mobile wall are described quantum mechanically and they are fully included in the overall system dynamics. In this optomechanical system, the field and the wall can interact with each other through the radiation pressure on the wall, given by the photons inside the cavity or even by vacuum fluctuations. We consider two cases: the one-dimensional electromagnetic field and the three-dimensional scalar field, and use the Green's functions formalism, which allows extension of the results obtain…
Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states
2009
We address the estimation of the loss parameter of a bosonic channel probed by arbitrary signals. Unlike the optimal Gaussian probes, which can attain the ultimate bound on precision asymptotically either for very small or very large losses, we prove that Fock states at any fixed photon number saturate the bound unconditionally for any value of the loss. In the relevant regime of low-energy probes, we demonstrate that superpositions of the first low-lying Fock states yield an absolute improvement over any Gaussian probe. Such few-photon states can be recast quite generally as truncations of de-Gaussified photon-subtracted states.
Cavity Ring-Down Spectroscopy measurements of Acetone concentration
2017
This research has been partly supported by the National Research Programme "The next generation of information and communication technologies" (NexIT).
One- and two-photon lasers with injected signal in a high-Q fabry-Pérot cavity
2000
Explicit models are derived for good cavity one- and two-photon lasers with an injected signal in a Fabry-Perot cavity. The steady solutions and their stability properties are obtained analytically and compared with the corresponding ring cavity model ones. Only quantitative differences between both types of cavities are found. In particular we show that (i) the Fabry-Perot cavity reduces significantly the domain of self-pulsing with respect to the ring cavity, and for the two-photon laser case (ii) larger output can be extracted from a Fabry-Perot cavity than from a ring cavity under certain conditions, something impossible in free-running lasers. We conclude that ring cavity models are se…
The intraoral device of overlaid disk-holding splints as a new in situ oral biofilm model
2014
Objectives: To design a device that allows the formation of in situ oral biofilm with similar characteristics to those from the dental plaque, overcoming the limitations of previous devices. Study Design: The Intraoral Device of Overlaid Disk-holding Splints (IDODS) was designed and manufactured. To test its validity, five healthy adult volunteers wore them for two and four days allowing the biofilm to grow without any type of distortion. After each period, the thickness, vitality and structure of the formed biofilm were measured with a Confocal Laser Scanning Microscope (CLSM) in combination with a dual fluorescence solution. All volunteers filled out a Likert-type questionnaire to evaluat…
Using ultrasound transmission velocity to analyse the mechanical properties of teeth after in vitro, in situ, and in vivo irradiation.
2000
Ultrasound transmission velocity (UTV) in isotropic material as a measure for the modulus of elasticity was correlated to mechanical properties. Changes in micromechanical properties of radiated teeth and influence of the oral cavity were to be evaluated nondestructively. UTV was measured in extracted teeth after 36 Gy and 62 Gy of in situ (enorally, with no contact to the oral cavity) and in vitro irradiation. Relative to controls, teeth subjected to 62 Gy in vivo showed higher UTV values for dentine and enamel. Sound teeth irradiated with 60 Gy in situ also showed higher UTV values for enamel, whereas dentine values were not significantly different from those of control. The mechanical pr…