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  • Articles: DFG German National Licenses  (2)
  • Class V lesion  (1)
  • HPLC  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Liquid-chromatographische Trennung von aliphatischen Polysulfiden (1976)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 280 (1976), S. 293-297 
    Details
    ISSN: 1618-2650
    Keywords: Trennung von Polysulfiden, aliphat. ; Chromatographie, Säulen ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aliphatische Di- und Polysulfide lassen sich im reverse-phase-Verfahren an einer chemisch gebundenen Octadecylphase (Micro-Pak-CH) mit MeOH-H2O als Eluens sauber trennen. Die qualitative Zuordnung der Peaks wird durch folgende Effekte vereinfacht: 1. log k′ nimmt bei konstanter S-Zahl linear mit der C-Zahl zu; 2. log k′ nimmt bei konstantem Alkylrest linear mit der S-Zahl zu; 3. log k′ fällt linear mit zunehmendem Gehalt des Eluens an MeOH. Bei Auswahl eines geeigneten Eluensgradienten können homologe Reihen wie R 2 S 2 mit R = Methyl bis R = Hexyl oder R 2 S x mit x = 2−7 mit einer Auflösung Res ∼ 2 zwischen allen Komponenten getrennt werden. Die Polysulfide werden bei diesen Trennungen nicht verändert.
    Notes: Abstract Aliphatic di- and polysulphides were separated by reverse-phase bonded-phase liquid chromatography. Chemically bonded octadecyl groups formed the stationary phase, mixtures of water and methanol were the mobile phase. For the qualitative analysis of polysulphide mixtures the following findings are important: 1. With constant S-number log k′ increases linearly with the C-number. 2. With constant hydrocarbon group log k′ increases linearly with the S-number. 3. log k′ decreases linearly with increasing methanol percentage in the eluent. With proper choice of gradient homologous series like R 2 S 2 with R = methyl to R = hexyl or R 2Sx with x = 2 ... 7 could be separated with a resolution of about 2 between all components. The polysulphides are not altered during these separations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Clinical performance of polyacid-modified resin restorations using ”softstart-polymerization” (1999)
    Springer
    Clinical oral investigations 3 (1999), S. 55-61 
    Details
    ISSN: 1436-3771
    Keywords: Key words Polyacid-modified resin ; Class V lesion ; Softstart-polymerization ; Clinical performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  This study investigated the influence of ”softstart-polymerization” on the clinical performance and marginal integrity of polyacid-modified resin restorations (PMR) in class V cavities. Eighty PMR restorations were placed in 20 patients [40 Dyract (DY); 40 Hytac (HY)] with (n pat =10) and without preparation (n pat =10). Restorations were light cured for 40 s either conventionally (CP) or with a lower light intensity for the first 10 s (SSP). Each patient received four restorations (DY-CP, DY-SSP, HY-CP, HY-SSP), which were examined clinically according to modified USPHS criteria, and by quantitative SEM-analysis after 7 days (baseline), 6 months and 1 year. Statistical analysis was performed using the Mann-Whitney-U test (P≤ 0.05) and error rates method. Clinically, no restoration showed recurrent caries or crevices. After 1 year, margins of 24–47% of the HY- and 36–53% of the DY-restorations were rated ”Bravo”. Marginal discoloration occurred in 20–37% in HY- and in 18–21% in DY-restorations. The error rates method revealed no significant differences between materials or between polymerization modes with and without preparation. Pairwise testing showed that without preparation, the marginal adaptation to dentin was significantly worse compared to enamel for HY with both polymerization modes, for DY with SSP. With preparation, no significant differences were found. Cavity preparation may have an influence on differences in marginal quality between enamel and dentin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007840050079
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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