| 11. |
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| 12. |
- Addi, Simon, et al.
(författare)
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Interface gap size of manually and CAD/CAM-manufactured ceramic inlays/onlays in vitro.
- 2002
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Ingår i: Journal of Dentistry. - 0300-5712 .- 1879-176X. ; 30:1, s. 53-58
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Tidskriftsartikel (refereegranskat)abstract
- Objectives : To determine the fit of ceramic inlays manufactured using a recently introduced CAD/CAM-system (Decim) and of two types of laboratory-made heat-pressed ceramics (IPS Empress and Opc). Materials and methods : Extracted human premolars were prepared to receive mesio-occlusodistal (MOD) ceramic inlays, for which 10 Denzir, 10 IPS Empress, and 10 Opc were fabricated. The Denzir restorations were produced by the manufacturer of the CAD/CAM-system, and the IPS Empress and Opc by student dental technicians. Before luting the internal fit on the diestone models and on the premolars was determined using replicas. After luting on the premolars with a resin composite the marginal and internal fit were measured. The values were analyzed statistically using ANOVA and Scheffe's test at a significance level of p<0.05. Results : Before luting there were no significant differences ( p>0.05) in the internal gap width between the three systems studied when placed on their matching diestone models. When placed on the premolars a significant difference ( p<0.01) in the internal fit was seen between Empress and Opc before luting, whereas there were no significant differences ( p>0.05) between Empress and Denzir and between Opc and Denzir. Between the diestone models and the premolars there were significant differences ( p<0.01) in the internal fit, except for IPS Empress. After luting there were no significant differences ( p>0.05) between IPS Empress and Denzir, whereas the marginal gap width was significantly wider ( p<0.001) for Opc than for IPS Empress and Denzir. The internal fit was significantly ( p<0.001) wider for Opc than for IPS Empress, whereas there were no significant differences ( p>0.05) between IPS Empress and Denzir or between Opc and Denzir. Conclusion : After luting there were only slight differences in the fit between the restorations fabricated using the three different manufacturing techniques and ceramics. Therefore, long-term follow-up studies are needed to assess the clinical significance of the slight differences between the three systems.
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| 13. |
- Adebahr, J, et al.
(författare)
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Ion and solvent dynamics in gel electrolytes based on ethylene oxide grafted acrylate polymers
- 2002
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Ingår i: The Journal of Physical Chemistry Part B. - : American Chemical Society (ACS). - 1520-5207 .- 1520-6106 .- 1089-5647. ; 106:47, s. 12119-12123
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Tidskriftsartikel (refereegranskat)abstract
- Multinuclear pulsed field gradient NMR measurements and theological viscosity measurements were performed on three series of polymer gel electrolytes. The gels were based on a lithium salt electrolyte swollen into a copolymer matrix comprising an acrylate backbone and ethylene oxide side chains. In each series the side chains differed in length and number, but the acrylate-to-ethylene oxide ratio was kept constant. It was found that the self-diffusion coefficient of the cations was much lower than that of the anions, and that it decreased rapidly when the side chains got longer. In contrast, the self-diffusion coefficient of the anions was found to be independent of chain length. In the gel electrolytes, the diffusion coefficients of the solvent molecules are relatively constant despite an increased viscosity with increasing length of the side chains. However, in saltfree gels made for comparison, the diffusion coefficients of the solvent molecules decreased with, increasing length of the side chains, which is consistent with an increased viscosity.
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| 14. |
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| 15. |
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| 16. |
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| 17. |
- Agah, Azin, et al.
(författare)
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Thrombospondin 2 levels are increased in aged mice : consequences for cutaneous wound healing and angiogenesis
- 2004
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Ingår i: Matrix Biology. - : Elsevier. - 0945-053X .- 1569-1802. ; 22:7, s. 539-547
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Tidskriftsartikel (refereegranskat)abstract
- The inhibitor of angiogenesis, thrombospondin 2 (TSP2), belongs to a group of matricellular proteins that are induced in response to injury and modulate the healing of dermal wounds. Thus, TSP-2-null mice display abnormal connective tissue architecture and increased angiogenesis in the dermis, and heal wounds at an accelerated rate. In this study, we report that the content of TSP2 is increased in the uninjured skin of aged mice. Furthermore, in primary dermal fibroblasts, TSP2 expression is increased both as a function of the age of the donor and days in culture. To determine the significance of the increased TSP2 in aged mice (two years or older), we performed full-thickness excisional wounds and compared their healing in aged and young (3–4 months) wild-type and TSP2-null mice. Gross morphological examination of wounds indicated that aged TSP2-null mice healed faster than their aged wild-type counterparts, but healing in aged mice was always sub-optimal in comparison to that in young animals. Surprisingly, despite the increase in TSP2, a potent inhibitor of angiogenesis, in wounds in aged mice, the vascular density of these wounds was not reduced in comparison to that in young animals. However, immunohistochemical analysis of healing wounds revealed a shift in the peak content of TSP2, from day 10 in young mice to day 14 or later in aged mice, and there was a corresponding delay in the expected increase in matrix metalloproteinase (MMP) 2 levels in aged TSP2-null mice. We suggest that the delay in expression of TSP2 and MMP2 in the wounds of aged mice could contribute to their impaired rate of wound healing.
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| 18. |
- Agarkova, Irina, et al.
(författare)
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The molecular composition of the sarcomeric M-band correlates with muscle fiber type
- 2004
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Ingår i: European Journal of Cell Biology. - 0171-9335. ; 83:5, s. 193-204
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Tidskriftsartikel (refereegranskat)abstract
- The M-band is the transverse structure that cross-links the thick filaments in the center and provides a perfect alignment of the A-band in the activated sarcomere. The molecular composition of the M-bands in adult mouse skeletal muscle is fiber-type dependent. All M-bands in fast fibers contain M-protein while M-bands in slow fibers contain a significant proportion of the EH-myomesin isoform, previously detected only in embryonic heart muscle. This fiber-type specificity develops during the first postnatal weeks. However, the ratio between the amounts of myosin and of myomesin, taken as sum of both isoforms, remains nearly constant in all studied muscles. Ultrastructural analysis demonstrates that some of the soleus fibers show a diffuse appearance of the M-band, resembling the situation in the embryonic heart. A model is proposed to explain the functional consequence of differential M-band composition for the physiological and morphological properties of sarcomeres in different muscle types.
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| 19. |
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| 20. |
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