Search results for "Rao"
showing 10 items of 1049 documents
VALIDITY AND RELIABILITY OF MEASUREMENTS OF THE PARAMETERS OF SMILE AESTHETICS: A COMPARISON BETWEEN DIGITAL AND PLASTER MODELS
2020
This study aims to evaluate the validity and reliability of the TRIOS3 Color intraoral scanner (3Shape A/S, Copenhagen, Denmark) and its associated Ortho Analyzer™ software in measuring parameters of smile aesthetics compared with measurements on plaster casts. The study sample comprised plaster casts and digital models obtained from 30 subjects. Height (H), mesiodistal diameter (MDD) and connecting space (CS) of the anterior teeth were measured with a digital calliper on the plaster models and with the orthodontic software on the digital models. Validity was assessed using a 2-tailed paired t-test; the reliability of measurements for intra-examiner was evaluated with the Intra-class Correl…
Optical solutions for the human eye with progressive loss of accommodation. Effect of the pupil.
2016
La presbicia se define como una reducción lenta, natural, irreversible, y relacionada con la edad de la máxima amplitud de acomodación, suficiente como para causar síntomas de borrosidad y astenopia en visión próxima. Afortunadamente, se han desarrollado varios sistemas ópticos que mejoran esta sintomatología y ayudan a recuperar las capacidades visuales para trabajar en visión próxima. Por otro lado, el análisis in-vitro permite obtener resultados objetivos de los sistemas ópticos y así ampliar el conocimiento del rendimiento óptico de estos sistemas. La presente tesis doctoral estudia la calidad óptica in-vitro de lentes de contacto e intraoculares. Se utilizaron dos sistemas in-vitro par…
Demo 168. Demostración de la ley de Raoult y de la nucleación heterogénea con un frasco de Franklin vertical
2021
Se presenta una demostración de aula que muestra que la condensación del vapor se produce preferentemente sobre la superficie de partículas sólidas y que la presión de vapor de una disolución disminuye cuando aumenta la concentración de soluto. A classroom demonstration is presented showing that vapor condensation occurs preferentially on the surface of solid particles and that the vapor pressure of a solution decreases as the solute concentration increases.
Masa intraoral de rápido crecimiento: a propósito de un caso
2005
La aparición de una masa intraoral supone un motivo de consulta frecuente en nuestra especialidad. La mayoría de los casos corresponden a lesiones benignas y, dentro de las malignas, a tumores primarios intraorales. Las metástasis suponen menos del 1 % de las lesiones malignas. Presentamos el caso de una mujer de 86 años de edad, sin antecedentes oncológicos, que acudió a nuestro servicio presentando una masa intraoral asintomática, de crecimiento rápido y volumen considerable, sin otros hallazgos de interés a la exploración. La lesión se acompañaba de erosión ósea subyacente. El resultado de la biopsia fue de adenocarcinoma metastático de probable origen abdominal, si bien el tumor primari…
Data from: Life history differences in age-dependent expressions of multiple ornaments and behaviors in a lekking bird
2014
Age is a major factor explaining variation in life-history traits among individuals with typical patterns of increasing trait values early in life, maximum trait expression, and senescence. However, age-dependent variation in the expressions of sexually selected traits has received less attention, although such variation underpins differences in male competitive abilities and female preference, which are central to sexual selection. In contrast to previous studies focusing on single traits, we used repeated measures of seven sexually selected morphological and behavioral traits in male black grouse (Tetrao tetrix) to quantify the effects of age and life span on their expressions and quantif…
Data from: Simultaneous age-dependent and age-independent sexual selection in the lekking black grouse (Lyrurus tetrix)
2016
Individuals' reproductive success is often strongly associated with their age, with typical patterns of early-life reproductive improvement and late-life senescence. These age-related patterns are due to the inherent trade-offs between life-history traits competing for a limited amount of resources available to the organisms. In males, such trade-offs are exacerbated by the resource requirements associated with the expression of costly sexual traits, leading to dynamic changes in trait expression throughout their life span. Due to the age dependency of male phenotypes, the relationship between the expression of male traits and mating success can also vary with male age. Hence, using longitu…
New imaging procedures in thyroid-associated ophthalmopathy
1996
Lymphocytic and other mononuclear cell infiltrations of the retrobulbar space are observed in thyroid-associated ophthalmopathy (TAO). The identification of somatostatin receptors on lymphocytes has provided a rationale for receptor-imaging with the radiolabeled somatostatin analog Octreotide in TAO. Furthermore, previous investigations have shown that quantitative magnetic resonance imaging (MRI) allows non-invasive detection of acute inflammatory changes in extraocular muscles. Therefore, in patients with TAO and controls, scans of the orbits were obtained at 4h and 24h after i.v. injection of the radionuclide and orbital MRI was performed. Compared to controls, patients with TAO showed a…
Root damage induced by intraosseous anesthesia'An in vitro investigation
2012
Objectives: The principle of the intraosseous anesthesia (IOA) relies on the perforation of the cortical plate of the bone for direct application of the local anesthetic solution into the underlying cancellous structures. During this procedure, IOA needles might accidentally come in contact with the tooth roots. The aim of the current in vitro study was to examine the consequences of this ‘worst case scenario’ comparing five commercially available IOA systems. Material and Methods: Extracted human roots were randomly perforated using five different IOA systems with a drilling time ≤5s. To simulate normal in vivo conditions, the roots were kept humid during the drilling procedure. Data was s…
Does the renin-angiotensin system also regulate intra-ocular pressure?
2009
The renin-angiotensin-aldosterone system is known to play an essential role in controlling sodium balance and body fluid volumes, and thus blood pressure. In addition to the circulating system which regulates urgent cardiovascular responses, a tissue-localized renin-angiotensin system (RAS) regulates long-term changes in various organs. Many recognized RAS components have also been identified in the human eye. The highly vasoconstrictive angiotensin II (Ang II) is considered the key peptide in the circulatory RAS. However, the ultimate effect of RAS activation at tissue level is more complex, being based not only on the biological activity of Ang II but also on the activities of other produ…
Pathogenesis and clinical relevance of bone marrow embolism in medullary nailing — demonstrated by intraoperative echocardiography
1993
Abstract For the clarification of pulmonary impairment after medullary nailing of femoral fractures, the intramedullary pressure in the femoral cavity during the operative procedure was investigated. In addition, an intraoperative transoesophageal echocardiography was performed which revealed two phenomena occurring once the intramedullary pressure had increased: snow-flurry and configured emboli. An experimental study in sheep was performed in order to define the substrata of the sonographic echoes. The level of intrafemoral pressure which would result in bone marrow intravasation and the substrata of the echocardiographic echoes were studied in sheep by applying pressure to the femoral ca…