Search results for "Retention"
showing 10 items of 347 documents
In vitro retentive strength of zirconium oxide ceramic crowns using different luting agents
2005
Statement of problem In contrast to gold crowns, in vitro determination of the retentive strength of all-ceramic crowns is more difficult because components allowing connection to testing apparatus are not as easily integrated into the all-ceramic material. Nevertheless, retentive strength data are crucial for obtaining information about the potential clinical performance of luting cements for all-ceramic restorations. Therefore, a new in vitro model was necessary to evaluate the retentive strength of all-ceramic crowns. Purpose The purpose of this in vitro study was to determine the retentive strength of 4 resin-cement systems, a compomer, a glass-ionomer cement, a resin-modified glass-ion…
Zinc removal in anaerobic sulphate-reducing liquid substrate process
2002
Abstract Zinc and sulphate removal from synthetic wastewater was investigated by using four laboratory parallel upflow-mode reactors (referred as R1 to R4; R1 contained carriers to retain biomass, whereas R2–R4 were operated as suspended reactors). All reactors were inoculated with anaerobically digested cow manure. R1 and R2 were first fed with glucose- and sulphate-containing feed for 48 days after which all four reactors were fed with wastewater containing 50 mg l−1 of zinc in R1–R3 and 200 mg l−1 in R4 and operated for 96 days. In all reactors, hydraulic retention time, organic loading rate, and sulphate load were 5–6 d, 0.2–0.4 kg COD m−3 d−1 and 3.3–3.8 g SO4 l−1 d−1, respectively, wh…
Inhibition of adult hippocampal neurogenesis disrupts contextual learning but spares spatial working memory, long-term conditional rule retention and…
2009
Neurogenesis in the adult dentate gyrus (DG) of the hippocampus has been implicated in neural plasticity and cognition but the specific functions contributed by adult-born neurons remain controversial. Here, we have explored the relationship between adult hippocampal neurogenesis and memory function using tasks which specifically require the participation of the DG. In two separate experiments several groups of rats were exposed to fractionated ionizing radiation (two sessions of 7 Gy each on consecutive days) applied either to the whole brain or focally, aiming at a region overlying the hippocampus. The immunocytochemical assays showed that the radiation significantly reduced the expressio…
In situ delivery of corticosteroids for treatment of oral diseases.
2017
In many mucocutaneous disorders, corticosteroids therapy is currently central. Systemic therapy is restricted to severe disorders whereas topical applications are considered as the first-line treatment. The oral cavity environment, the medication form and other factors related to the delivery method are key factors for the therapy efficiency and effectiveness. Current marketed medications are not able to avoid wrong drug exposure and scarce patients’ compliance. Innovative in situ delivery systems are able to prolong the drug retention time on the mucosa and to avoid the drawbacks of conventional formulations. This review is intended to give a general overview of oral mucocutaneous patholo…
Drug delivery from the oral cavity: focus on a novel mechatronic delivery device
2007
Dental drug delivery systems have been used for a long time, in particular for the local therapy of diseases affecting the oral cavity. Research today concentrates on the design of formulations to increase their retention time. Even today, however, prosthetic devices incorporating drug delivery are rarely used. Mainly, they are focused on prophylaxis and the release of antibacterial agents. However, as buccal delivery, because of its undeniable advantages, has become popular for systemic drug delivery, and prolonged well-controlled release has been identified as beneficial, especially for chronic diseases, a new class of delivery systems is evolving: highly miniaturized computerized deliver…
Surface debris of canal walls after post space preparation in endodontically treated teeth: A scanning electron microscopic study
2004
Abstract Purpose To evaluate surface cleanliness of root canal walls along post space after endodontic treatment using 2 different irrigant regimens, obturation techniques, and post space preparation for adhesive bonding. Study design Forty teeth, divided into 4 groups, were instrumented, using Ni-Ti rotary files, irrigated with NaOCl or NaOCl + EDTA and obturated with cold lateral condensation (CLC) or warm vertical condensation (WVC) of gutta-percha. After post space preparation, etching, and washing procedure, canal walls were observed using a scanning electron microscope (SEM). Amount of debris, smear layer, sealer/gutta-percha remnants, and visibility of open tubules were rated. Result…
CHANGING SCHOOL AFTER THE GLOBAL RECESSION : THE CASE OF LATVIA
2015
Latvia demonstrates common trends with the majority of the countries affected by the recession, as well as some peculiarities in overcoming the impact of the global economic and financial recession on education mainly due to an unbelievable austerity. Education in this country has suffered greatly, and its damage is adequate to the 67% of the budget cuts between 2008 and 2011 (IZM, 2011). The article deals with the school improvement after the recession, recent implementation of innovations to cover the damages and catch up with the ideas of the Next Generation learning, to supply schools with the appropriate curricula and meeting the learners needs for their individual development and abil…
Attuned HRM Systems for Social Enterprises
2021
This paper is motivated by a puzzling observation made when conducting a case study of ProCredit (PC), a well-known social bank. The HR practices that this social enterprise (SE) adopted to cultivate mission identification were unfavorably impacting its retention rate. Building on prior research and our analysis of the case, we argue the need for SEs to embrace HRM systems that are both mission-identification proactive and employee-retention preemptive. It theorizes that these HRM systems should be attuned to the labor market conditions (e.g., market segmentation and competition for employees) that frame how SEs develop and sustain Person-Organization (P-O) fit. Attuned HRM systems are adap…
Can Auditors Be Independent? – Experimental Evidence on the Effects of Client Type
2012
Recent regulatory initiatives stress that an independent oversight board, rather than the management board, should be the client of the auditor. In an experiment, we test whether the type of client affects auditors’ independence. Unique features of the German institutional setting enable us to realistically vary the type of auditors’ client as our treatment variable: we portray the client either as the management preferring aggressive accounting or the oversight board preferring conservative accounting. We measure auditors’ perceived client retention incentives and accountability pressure in a post-experiment questionnaire to capture potential threats to independence. We find that the type …
Market-driven product and service design: Bridging the gap between customer needs, quality management, and customer satisfaction
2000
Bridging the gap between a firm's internal quality improvements and external measures of customer needs and satisfaction is an important yet complex translation process. The process has traditionally been studied within two very different domains. An external focus on customers has been the domain of marketers. Manufacturing and engineering-based approaches to quality management and improvement have traditionally taken a more internal, process improvement focus. Both areas have recognized the need to broaden thier focus and bridge the gap between internal quality and external customers needs and satisfaction. This paper offers a framework to integrate these two domains. A case study is pres…