Search results for "Extract"
showing 10 items of 2769 documents
Evaluation of the different exposure parameters for the accurate diagnosis of peri-implantitis severity in digital panoramic radiography.
2022
To evaluate the accuracy of the diagnosis of peri-implant bone defects? severities in digital panoramic radiographs obtained at different tube voltage and/or tube current settings. Two different sizes of peri-implant bone defects (type 1 and type 2) were prepared after the implants were inserted into 29 bovine rib blocks. Digital panoramic radiographs were obtained at eight different tube voltage and/or tube current settings for all rib blocks. Implant images were cropped separately. The average intensity value (AIV) of cropped images were analyzed using Adobe Photoshop CC software. The Kruskal-Wallis H test was used to compare AIVs. All cropped images were evaluated using a five-point Like…
Incidence of oral sinus communications in 389 upper third molar extraction
2006
Podeu consultar la versió en castellà a http://hdl.handle.net/2445/117329
Immediate dental implant placement in post-extraction-infected sites decontaminated with Er,Cr:YSGG laser: a retrospective cohort study
2022
Antecedentes científicos y objetivos de estudio La técnica quirúrgica para la colocación inmediata de un implante dental en un alvéolo post-extracción fue propuesta inicialmente en 1976 por Schulte y Heimke. La colocación de implantes dentales en alveolos post-extracción ofrece ventajas tales como un tiempo de tratamiento reducido y una mayor comodidad para el paciente; además esta técnica permite reducir la exposición quirúrgica del paciente y limitar la reabsorción fisiológica ósea posterior a la extracción del diente, conservando la estética. La justificación para la extracción de un diente comprometido a menudo está relacionada con la presencia de una lesión periapical, consecuencia de …
Estudio comparativo in vitro de distintos métodos de extracción de tornillos fracturados en implantes
2022
En los tratamientos sobre implantes, pueden aparecer complicaciones como la fractura de los tornillos que sujetan las prótesis que van sobre ellos. El objetivo principal de esta investigación fue evaluar in vitro la efectividad de los sistemas mecánicos de extracción de tornillos fracturados en implanto-prótesis. Material y Método: Se utilizaron 180 muestras que consistían en un implante de conexión interna Sweden&Martina® con un pilar prefabricado de titanio Sweden&Martina®, que se atornillaba al implante con un tornillo de titanio, de la misma casa comercial. Cada una de las muestras fue sometida a una carga cíclica y posteriormente a una carga de compresión hasta conseguir la fractura de…
Les sarcophages mérovingiens en trachyte. Des carrières aux lieux d'enfouissement (Massif central)
2018
A multi-disciplinary team is currently working on trachyte, a volcanic rock from the Chaîne des Puys (French massif central), within a research program supported by the French ministry of Culture. Although it has been known at least since the 19th century that this rock was used for construction and sculpture in antiquity, and in the making of sarcophagi in the middle ages, the systematisation of the research on trachyte, carried out since 2008, has enabled us to make significant advances in the knowledge of its exploitation and dissemination. Geologists have established a detailed identity card of the six volcanoes where massive lava is available, thereby allowing the classification of eac…
The Extractive Industries Transparency Initiative (EITI) in Cameroon : realities and prospects
2010
For a long time, Cameroon was a success story in the context of Africa’s development. Unfortunately, the economic crises of the eighties and early nineties led to the failure of the development strategies that had been pursued until then, resulting in a severe deterioration of the country’s economy and the living standards of the Cameroonian people (Mentan, 2003). However, this country possesses significant oil wealth which if properly managed can generate abundant revenue to boost economic growth and fund anti-poverty measures. In 2005, Cameroon adhered to the Extractive Industries Transparency Initiative (EITI). A proper implementation of this initiative will improve transparency in the c…
Applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon
2023
Hybrid aspens have long attracted scientific interest, but the research on their use as feedstocks for chemical applications are still very limited. The bark biomass of the poplar species contains many valuable extractives that can be utilized as value-added products. This paper examines the applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon. To explore this, the study considers 1) the basic chemical composition of the bark in terms of added value potential, 2) the basic chemical composition of the bark extract and the effect of its pretreatment on the extract composition, 3) the production of rigi…
Behaviour of Extractives in Norway Spruce (Picea abies) Bark during Pile Storage
2022
The current practices regarding the procurement chain of forest industry sidestreams, such as conifer bark, do not always lead to optimal conditions for preserving individual chemical compounds. This study investigates the standard way of storing bark in large piles in an open area. We mainly focus on the degradation of the most essential hydrophilic and hydrophobic extractives and carbohydrates. First, two large 450 m3 piles of bark from Norway spruce (Picea abies) were formed, one of which was covered with snow. The degradation of the bark extractives was monitored for 24 weeks. Samples were taken from the middle, side and top of the pile. Each sample was extracted at 120 °C with both n-h…
An Updated Guideline for Assessing Discriminant Validity
2022
Discriminant validity was originally presented as a set of empirical criteria that can be assessed from multitrait-multimethod (MTMM) matrices. Because datasets used by applied researchers rarely lend themselves to MTMM analysis, the need to assess discriminant validity in empirical research has led to the introduction of numerous techniques, some of which have been introduced in an ad hoc manner and without rigorous methodological support. We review various definitions of and techniques for assessing discriminant validity and provide a generalized definition of discriminant validity based on the correlation between two measures after measurement error has been considered. We then review te…
Antibacterial activity and cytotoxicity of selected Egyptian medicinal plants.
2011
Medicinal plants have been used as a source of remedies since ancient times in Egypt. The present study was designed to investigate the antibacterial activity and the cytotoxicity of the organic extracts from 16 selected medicinal plants of Egypt. The study was also extended to the isolation of the antiproliferative compound jaeschkeanadiol p-hydroxybenzoate (FH-25) from Ferula hermonis. The microbroth dilution was used to determine the minimal inhibitory concentration (MIC) of the samples against twelve bacterial strains belonging to four species, Providencia stuartii, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Escherichia coli, while a resazurin assay was used to assess the cytoto…