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  • 1
    Electronic Resource
    Electronic Resource
    Inhibition of bacterial colonization by antimicrobial agents incorporated into dental resins (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 15 (1988), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The antimicrobial activity of several chemical agents was determined by incorporating these agents into dentine adhesive resin and following the colonization of Streptococcus mutans on the surfaces of the resin and culture vessel, as well as in the surrounding medium, by optical density measurements. It was found that sodium fluoride and dodecylamine, an organic amine, exhibited excellent antimicrobial properties. These chemicals not only inhibited bacterial growth completely but also seemed to reduce the adhesion of the bacteria to the resin surface. A silver compound, protargin, was mildly effective in inhibiting growth ofS. mutans. Copper oxide and chelating acids such as vanillic acid, syringic acid, and ethylenediamine-n, n'diacetic acid (EDDA) were not effective as antimicrobial agents againstS. mutans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1988.tb00176.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relative solubilities of hybrid ionomers and compomers by acid impingement (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this investigation was to determine the relative erosion/solubility for hybrid glass–ionomers and a compomer using the jet-impingement technique with lactic acid of various molarities. The materials studied included Dyract®, Duet®, Vitremer®, Advance®, Fuji-II LC®, and Fuji-I®, Ketac Cem® and Modern Tenacin® as the control. Data were analysed using anova and Tukey's comparison test. Results indicated that depth of erosion/solubility with hybrid glass–ionomers and compomers was not measurable by the normal procedure. Similarly, weight changes were not detectable at 0·002, 0·02 and 0·05 m (except for Advance® at 0·05 m). All glass–ionomers materials and the compomer revealed weight changes at 0·1 m after 24 h, in the following increasing order: Dyract®〈Fuji-II LC®=Duet®〈Advance®〈Vitremer®. It was concluded that weight loss is a better parameter to characterize these new hybrids glass–ionomers and compomers for erosion/solubility by jet-impingement. In addition, a lactic acid of minimum 0·1 m as a test solution is required to generate 24 h-data that can be measured in most laboratories and thus used for statistical comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00452.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fibrin glue improves the healing of irradiated bowel anastomoses (1992)
    Springer
    Diseases of the colon & rectum 35 (1992), S. 249-252 
    Details
    ISSN: 1530-0358
    Keywords: Intraoperative radiation ; Anastomosis ; Tensile strength ; Fibrin glue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Many surgeons are reluctant to construct a bowel anastomosis with irradiated intestine. Previous studies have demonstrated diminished tensile strength of rat small bowel anastomoses that have been irradiated intraoperatively. To determine whether fibrin glue, a known tissue adhesive, improves the healing of these anastomoses, 69 male Sprague-Dawley rats were randomized into three anastomotic groups: Group 1, sutured ileal anastomosis without radiation or fibrin glue; Group 2, irradiated sutured ileal anastomosis without fibrin glue; and Group 3, irradiated ileal anastomosis with fibrin glue added to the suture line. Groups 2 and 3 received a single dose of 2,000 R intraoperatively. At seven days, the rats were sacrificed and the anastomotic segment was tested for breaking (tensile) strength. Anastomotic collagen content was evaluated using a hydroxyproline assay. Tensile strength results demonstrated that Group 2 was significantly weaker than Groups 1 and 3 (P=0.001) and that the hydroxyproline content of Group 3 was significantly greater than that of Group 2 (P=0.015). These results show that the addition of fibrin glue to an intraoperatively irradiated small bowel anastomosis improves healing, as demonstrated by both tensile strength and hydroxyproline content studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02051017
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of two non-endurance exercise protocols on established bone loss in ovariectomized adult rats (1993)
    Springer
    Calcified tissue international 52 (1993), S. 239-243 
    Details
    ISSN: 1432-0827
    Keywords: Osteoporosis ; Exercise ; Ovariectomy ; Bone strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The effects of non-endurance exercise on bone properties were evaluated in 9-month-old sham-operated (SH) and ovariectomized (OVX) rats. The studies were started 3 months postsurgery, after bone mass was decreased in OVX rats. The sham and OVX rats were either kept sedentary (SED) or were trained to run with one of two protocols: 12 m/minute, 50 minutes/day, 4 days/week (low intensity, frequent, EX-1); or 21 m/minute, 40 minutes/day, 1 day/week (moderate intensity, infrequent, EX-2). A group of seven rats evaluated at the beginning of the study served as baseline control. The bone mineral was assessed by the ash weight of the left femur, tibia, and 4th lumbar vertebra. Biomechanical (strength, deformation, stress, strain, and stiffness) and morphometric (length, cortical and medullary area, moment of inertia) properties were evaluated for the right femur. There was a significantly lower bone mineral and mechanical properties in OVX-SED (n=7) than in SH-SED (n=10) rats. The OVX-EX-1 (n=6) rats had higher ash content of femur and tibia than OVX-SED rats, but the change was significant only for tibia. The EX-2 had no effect on the ash content, but femur stress was higher in OVX-EX-2 (n=8) than in OVX-SED rats. The femur yield force and deformation were improved in OVX rats with both exercise protocols, whereas the vertebra ash weight, femur strain, modulus of elasticity, length, cortical area, and moment of inertia were not changed. Non-endurance exercise did not affect bone properties in either SH-EX-1 (n=7) or SH-EX-2 (n=8) groups. We conclude that non-endurance exercise has beneficial effects on established osteopenia in ovariectomized rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298726
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The influences of electrical potential and surface finish on the fatigue life of surgical implant materials (1975)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 9 (1975), S. 611-621 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The influence of both imposed anodic potential in Ringer's solution and surface finish on the fatigue lives of annealed 316 type stainless steel and annealed pure titanium were measured and statistically compared to fatigue data run in air. The applied potentials in simulated extracellular fluid approximated conditions existing within the body while also producing the types of surface defects actually found on removed long time implants within the time interval of the accelerated R. R. Moore fatigue tests. Differentiating tests were run at single levels of applied cyclic stress well above the endurance limits.In Ringer's solution, the fatigue life of the 316 stainless steel decreased with increasing applied potential, and at +500 mV was significantly shorter than when run in air. At each condition, the 316 stainless steel was independent of initial surface finish. In contrast, the fatigue life of titanium improved rapidly with increasingly fine surface finishes. Furthermore, compared to air, the application of +500 mV in Ringer's solution improved the life of the rough surface finished material and markedly increased the number of cycles to failure for the electropolished specimens.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820090607
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    Paper (German National Licenses)
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