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  • Articles: DFG German National Licenses  (24)
  • 1995-1999  (23)
  • 1980-1984  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal behavior of casting investment during setting (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 22 (1995), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SUMMARY The aim of this study was to examine the thermal reactions of silica-sol liquids for mixing investment powders using differential thermal analysis (DTA) and also the setting behaviour of the mixed powders using differential scanning calorimetry (DSC). The silica-sol liquids showed the appearance of vapourization (around 100°C as a peak temperature) and combustion (200–300°C) in DTA measurement. Mixed silica-sol investment exhibited the setting behaviour with an exotherm in the DSC measurement representing that greater peak time, setting time and heat in mixed investment than with gypsum-bonded investment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1995.tb00787.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hardness and fracture toughness of four commercial visible light-cured composite resin veneering materials (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 22 (1995), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary Four commercial visible light (VL)-cured composite resin veneering materials with a dentine shade were examined for their Knoop hardness and fracture toughness. Composite specimens were classified into three groups. The first group was cured by VL only, the second group was cured by VL and postcured by VL and the third group was cured by VL and post-cured by heat. It became evident that one composite containing four-functional urethane monomer had both hardness and fracture toughness greater than those of the other three composites containing two-functional urethane monomer. The filler content (vol%) in the composite tended to be linearly proportional to both hardness and fracture toughness. Post-curing by VL and heat were proven to effectively increase both hardness and fracture toughness of once light-cured composites. These results suggest that the clinical performance (e.g. wear resistance and colour stability) of VL-cured composite resin veneering materials might be improved with the aid of post-curing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1995.tb00234.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intrahepatic cholangiocarcinoma with marked hypervascularity (1999)
    Springer
    Abdominal imaging 24 (1999), S. 66-68 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Intrahepatic cholangiocarcinoma—Hypervascular.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two rare cases of small intrahepatic cholangiocarcinoma with marked hypervascularity are reported. Dynamic computed tomographic and magnetic resonance images of the two cases revealed strong enhancement of the whole tumor on the early phase and prolonged enhancement on the late and delayed phases. In both cases, the tumors turned out to be well-differentiated tubular cholangiocarcinoma that contained a large number of tumor cells and few interstitial fibrous tissues. These results suggest that some intrahepatic cholangiocarcinoma should be differentiated from other hypervascular hepatic tumors, especially hepatocelluar carcinoma, and that prolonged enhancement of the tumor on late and delayed phases of dynamic images could be of diagnostic value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900442
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ductal adenocarcinoma of the pancreas with intratumoral calcification (1999)
    Springer
    Abdominal imaging 24 (1999), S. 610-613 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Pancreas—calcification—Neoplasms—Adenocarcinoma—Computed tomography (CT)—Helical.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present two cases of ductal adenocarcinoma of the pancreas with intratumoral calcification. The two cases indicate two different etiologies for intratumoral calcification in ductal adenocarcinoma. Thus, the possibility of adenocarcinoma should be considered when a tumor with intratumoral calcification is found, although the incidence of intratumoral calcification in the ductal adenocarcinoma of the pancreas remains rare.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900574
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Dental magnesia-based investments for cast titanium crown: setting and fitness (1995)
    Springer
    Journal of materials science 6 (1995), S. 479-482 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Titanium crowns were cast using experimental magnesia-based investment mixed with hydrolysed sol. Ten types of hydrolysed sol were used, adding a catalyst to each sol whether the setting (hardening) of the magnesia investment powder appeared within 3 h after mixing. A penetration test using a Vicat needle to measure needle depth as setting was carried out after mixing of the investment powder, showed that the penetration depth decreased gradually with increasing holding time at room temperature. Setting time was shown to be more or less than 3 h or dependent on the gelation. The total magnitude of expansion (setting + thermal) ranged from 0.5 to 0.9% using the selected mixtures. Titanium cast crowns were made in the range 0.02–1.3 mm (occlusal) and 0.03–1.5 mm (cervical), depending on the expansion value of the particular magnesia-based investments mixed with the hydrolysed sols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123373
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dental application of polyfunctional urethane comonomers to composite resin veneering materials (1997)
    Springer
    Journal of materials science 8 (1997), S. 57-60 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Urethane monomer/diluent monomer mixtures were used in dental composite resin veneering materials filled with various ratios of powder (filler)/liquid (comonomer), P/L. Hardness values of unfilled resins containing benzoyl peroxide only (BP0; 0.5 wt%), and filled resins (included trimethylol propane trimethacrylate (TMPT) composite filler) were tested. Significant increases in hardness were obtained with the use of TMPT composite filler in the resins. Also, their modulus values measured by bend test showed an increasing trend, compared to a commercial composite resin veneering material (a control sample; CONT) with a lower filler content (50 wt%). The DME–DPMDC/HPDM comonomer (dimethacryloxyethyl diphenylmethane-4,4′-dicarbamate/hydroxypropyl dimethacrylate), which showed a smaller fraction of surface porosity, gave greater mechanical strength values at P/L ratios of 0.55 (17.8 wt% filler content) to 1.20 (27.3 wt%) than a CONT resin. The coefficient of thermal expansion was smaller in urethane-based filling materials than a CONT resin. Also, greater activation energy of thermal decomposition was observed in the resin samples with P/L ratio 0.75 to 1.20 than in a CONT resin. Thermally-induced decomposition occurred with smaller weight loss in the experimental filled resins than in a CONT resin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018546414145
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Interfacial stress distribution between bovine dentine and resin composite in dentine bonding systems (1996)
    Springer
    Journal of materials science 7 (1996), S. 617-621 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: In finite element stress analysis, the principal interfacial stress at a tensile bond strength of 10 MPa during tensile loading was estimated for the resin composite/dentine material including the bonding area with elastic moduli of 0.03, 0.3, 3.0 and 12.0 GPa assumed in this study. Interfacial stress along the resin composite/bonding area interface or bonding area/dentine interface increased with increasing elastic modulus. The interfacial stress distributed non-uniformly and locally at the most sensitive sites, that is, the edge of the resin composite/bonding area interface with the lowest elastic modulus (0.03 GPa) and the edge of bonding area/dentine interfaces with other elastic modulus values (0.3, 3.0 and 12.0 GPa). The maximum value of interfacial stress increased linearly with increasing elastic modulus of bonding area from 0.03 to 12.0 GPa. This study showed that the distribution of interfacial stress was highly non-uniform along the interfaces of the bonded areas in dentinal adhesives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058201
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Dental application of binary urethane monomer mixtures:strengthened resin matrix (1997)
    Springer
    Journal of materials science 8 (1997), S. 149-155 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The strengthened resin matrices in six experimental binary visible light-cured (VLC) urethane monomer mixtures were examined in terms of mechanical strength. A 60 wt% bis-GMA/40 wt% binary monomer mixture was used as a control sample. A dry state (1 day in air at 37°C) and a wet state by immersion in distilled water (7 and 30 days at 37°C) were investigated. The compressive strength and diametral tensile strength of urethane monomer samples had values equivalent to, or greater than those of a control sample in the dry state, but had increased values in the wet state. The nano-indentation hardness values in experimental urethane monomer mixtures were greater than that in a control sample in the dry state, showing that immersion in water gave increased strength (maximum increase was about 2.5 times) in six binary urethane monomer mixtures. The compressive strength of the samples in the dry and wet states exhibited linearly increasing elastic modulus values for the resin matrix in the range about 50 to 2600 MPa. The toughened resin matrix had smaller amounts of residual monomer in the urethane monomer mixtures (0.41 to 5.03 wt%) compared with that of the binary 60bis-GMA/40TEGDMA mixture (0.71 to 6.26 wt%). This study has revealed that resin matrices are strengthened by the use of four-functional urethane monomers in experimental binary urethane monomer mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018571119597
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Decomposition analysis of binary polyfunctional urethane monomer mixtures (1997)
    Springer
    Journal of materials science 8 (1997), S. 461-464 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Thermal decomposition in three binary monomer mixture systems containing an experimentally synthesized monomer (EXP3) and a commercial polyfunctional urethane monomer (U–4TXA) was examined in terms of differential thermal analysis (DTA) and simultaneous thermogravimetry (TG) analysis when a sample was heated to 800°C. The binary EXP3/U–4TXA monomer mixtures were visible light-cured (VLC) resins which included CQ (camphorquinone=0.5 wt%) and DMAEMA (dimethylaminoethyl methacrylate=0.5 wt%) as the photoinitiator. Their DTA curves showed that thermal decomposition initiated at around 300°C and finished at around 500°C. TG curves showed complete weight loss at 800°C during thermally induced decomposition: the decomposition reaction at weight losses of 5 to 50% was calculated from the slope of the (1/T) versus log10(Hr) diagram, because the exothermic decomposition temperature shown on DTA curves increased with increasing heating rate from 2 to 20°C/min. Thermal decomposition analysis showed that a decomposition with weight change had exothermic heats ranging from 0.38 to 1.07 kJ/g for the EXP U1 mixture, 1.06 to 1.76 kJ/g for EXP U2 and 1.74 to 2.02 kJ/g for EXP U3. Activation energy ranged from 1.42 to 1.89 kJ/mol at weight losses of 5 to 50% in the three binary EXP3/U–4TXA monomer mixture systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018517924565
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Dental application of crystalline monomer with urethane linkages: a thermoanalytical study on bis-GMA-based resins (1995)
    Springer
    Journal of materials science 6 (1995), S. 396-399 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: The thermal properties of bis-GMA-based resins containing a synthesized crystalline DME-TDC which was dissolved to bis-GAM/TEGDMA base resin by 10 or 20wt% were examined. Camphorquinone (0.5%) and a reducing agent (0.5%) were added to the base resin before the addition of DME-TDC. A thermoanalytical study using differential thermal analysis (DTA) and differential scanning calorimetry (DSC) showed that thermal change in the DTA and DSC curves depended on the composition of the bis-GMA-based resins. Heat for curing was lowest in 50/50 base resin of 40 wt% bis-GMA/60 wt% TEGDMA, 50/50 and 60/40 base resins in DTA analysis during heating. The addition of DME-TDC to each resin increased heat requirements in 50/50 resin and decreased heat requirements in 40/60 and 60/40 resins. The thermal decomposition of 50/50 bis-GMA-based resin including DME-TDC occurred at a higher temperature than that in 40/60 and 60/40 based resin. The value of activation energy for curing performance was lowest for a DME-TDC including bis-GMA-based resin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120280
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    Paper (German National Licenses)
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