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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 4 (1977), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The performances of ultraviolet (uv) lights used to initiate polymerization in fissure sealant systems were studied with a view to establishing recommendations for improving clinical results. The relationship between the setting time of an uv polymerized sealant (Nuva-seal) and the intensity of radiation applied was first established. This was compared with the intensity and distribution of radiation from seven Nuva-lites and one Quartzlite. It was found that some of the Nuva-lites did not produce an average intensity of uv radiation sufficient to completely polymerize Nuva-seal within the manufacturer's recommended exposure times. It is suggested that this may be a factor contributing to the large variation in sealant retention found in the different clinical trials with Nuva-seal. Finally, a number of recommendations are made to ensure that sufficient uv radiation is applied to all sealant surfaces when Nuva-seal system is used.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 10 (1983), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Three laboratory studies were carried out with the aim of improving or streamlining enamel surface treatment procedures in fissure sealing.In Study 1, the effect of reducing acid etch time from 60 s to 10 s was assessed by SEM and tensile bond strength measurements. Reduction in etch time produced a finer etch pattern, gave a reduced but still high, bond-strength, albeit with slightly poorer long-term adhesion.Study 2 showed that a conventional acid etch treatment could completely remove acquired pellicle, without prior prophylaxis. SEM studies and bond-strength measurements corroborated this view.In Study 3, compressed air and chemical drying agents were compared for drying speed and efficiency. Compressed air gave more rapid, thorough drying, and greater resultant bond strengths.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 5 (1978), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Since the ability of u.v. setting pit and fissure sealants to set in depth is dependent on the penetration of the u.v. radiation, the absorption coefficients of Nuva-seal and Alphaseal were determined at 365 nm, the wavelength of radiation used to polymerise both materials. Nuva-seal and Alphaseal had absorption coefficients of 0·165 mm −1 and 6·25 mm −1, respectively. The u.v. fluorescent dye present in Alphaseal contributed 2·5 mm −1 to its absorption coefficient and the remaining absorption was due to the 5% w/w catalyst concentration present, since the basic resin had no significant absorption. Therefore Nuva-seal may set adequately to the depths required of fissure sealants, but Alphaseal may not, unless a very high intensity u.v. source is used. A reduction in the catalyst concentration and the removal of the u.v. fluorescent dye might improve the setting characteristics of Alphaseal.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 8 (1981), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effect of accidental salivary contamination on the retention of fissure sealants is investigated via in Vitro bond tests and scanning electron microscopy. The strength of the bond between sealant and saliva contaminated and washed enamel (168 ± 14 kg cm−2) is not found to be significantly different from the bond strength to uncontaminated enamel (174 ± 17 kg cm−2). Unwashed contaminated enamel gives significantly reduced bond strength (68 ± 11 kg cm−2).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 4 (1970), S. 89-90 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 6 (1970), S. 301-315 
    ISSN: 1432-0827
    Keywords: Calcium ; Absorption ; Radioisotopes ; Oral ; Intravenous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les équations dérivées pour mesurer les vitesses de déplacement du calcium au niveau de l'intestin et du sang ont été appliquées à des résultats obtanus chez 23 sujets. Chaque sujet a reçu 5 μ Ci45Ca par injection intra-veineuse et 20 μ Ci47Ca per os. Les activités spécifiques du plasma, de l'urine et des fèces ont été mesurées et l'absorption et les vitesses de déplacement endogène du calcium ont été déterminées, en utilisant les deux méthodes décrites antérieurement. Les mesures basées sur les calculs du contenu des fèces en ces deux isotopes, sont plus satisfaisantes que les calculs réalisés sur le plasma. Les mesures réaliséez chez des sujets, ayant été soumis à la chirurgie gastrique, donnent certaines informations concernant les régions d'absorption du calcium.
    Abstract: Zusammenfassung Die abgeleiteten Gleichungen zur Messung der Calciumdurchflußgeschwindigkeiten in Darm und Blut kamen zur Anwendung bei der Aufarbeitung von Daten, die für 23 Personen zusammengestellt wurden. Jede Versuchsperson erhielt 5 μC45Ca i. v. und 20 μC47Ca p. o. Die spezifischen Aktivitäten von Plasma, Urin und Faeces wurden dann gemessen und daraus die Absorption sowie die endogene Calciumdurchflußgeschwindigkeit ermittelt, wozu beide in einer früheren Publikation beschriebenen Methoden benützt wurden. Die auf den Integralberechnungen der fäkalen spezifischen Aktivitäten basierenden Messungen der beiden Tracer ergaben ein befriedigenderes Resultat als jene, die auf den spezifischen Aktivitäten des Plasmas beruhten. Die Messungen an Magen-Darm-Operierten ergaben einige Hinweise auf die Lokalisation der Calciumabsorption.
    Notes: Abstract The equations derived to measure the calcium flow rates in the gut and blood have been applied to data gathered from 23 subjects. Each subject was given 5 μCi45Ca by intravenous injection and 20 μCi47Ca orally. The specific activities of plasma, urine and faeces were then measured and the absorption and calcium endogenous flow rates found, using both methods described in a previous publication. The measurements based on the calculations of the faecal occupancies, of the two tracers were found to be more satisfactory than the calculations based on plasma occupancy. The measurements on subjects who had gastric surgery gave some information on the site of calcium absorption.
    Type of Medium: Electronic Resource
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