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  • 1995-1999  (2)
  • 1990-1994  (3)
  • 1997  (2)
  • 1994  (3)
Materialart
Erscheinungszeitraum
  • 1995-1999  (2)
  • 1990-1994  (3)
Jahr
  • 1
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetic and specific-heat studies of U2T2X compounds show a frequent occurrence of the γ enhancement in conjunction with the onset of antiferromagnetic ordering. The largest value of 830 mJ/mol K2 was observed in U2Pt2In, which is nonmagnetic down to 1.2 K. Variations of electronic structure are documented by optimized relativistic LCAO calculation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Abstract The biocompatibility and osseous integration of a new composite material made of polyurethane and a calcium silicophosphate ceramic was investigated in a loaded implant model in sheep and compared to that of commercially pure titanium. Six months after implantation, interfacial shear strength was higher between the titanium and bone than between the composite and bone. After 2 years, however, the shear strength was significantly higher in the composite group. Histologically, both implants were surrounded by bone and fibrous tissue and there were no signs of inflammation. Direct contact of bone on the composite surface increased significantly with time, whereas there was no time-dependent increase of bone contact on titanium. It can be concluded that the biocompatibility and osseous integration of the composite was very good in the loaded implant model used. It is therefore suggested that the new composite is a promising biomaterial for orthopaedic implants.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Abstract The aim of this study was to evaluate the healing capacity of proximal anterior cruciate ligament (ACL) ruptures following primary repair with and without a bioresorbable augmentation. The ACL was transected at the femoral origin in the right knee joint of 24 sheep. The ACL was repaired in eight sheep (group B) without, and in eight sheep (group C) with a bioresorbable augmentation. Eight sheep without repair served as a control (group A). No immobilization was performed in any group. The sheep were sacrificed 13 weeks post-operatively. Macroscopically, all repaired ACLs were healed. The augmentation device was broken in all cases, but not completely degraded. In group A, none of the transected ACLs had healed. The anterior drawer under a load of 50 N was significantly lower in group C than in group A (p〈0.01). No significant difference was seen between groups B and A. The distribution and extent of chondromalacia (CM) in the operated knees depended on the type of operative treatment (p〈0.01). Groups A and B showed significantly more CM in the operated knee than in the non-operated knee (each p〈0.05). Proximal ACL ruptures can heal in sheep after both non-augmented and augmented ACL repair with free-functional rehabilitation. However, augmented repair leads to significantly better stability of the knee joint compared to transected controls and better limits the development of degenerative changes.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of orofacial orthopedics 55 (1994), S. 104-110 
    ISSN: 1615-6714
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary The purpose of this study was to examine functional occlusion of impacted maxillary canines which had been moved orthodontically into the line of occlusion. Examinations were performed on both patients and on an articulator, which was adapted to correspond to the axiotraphical findigns. Functional contracts on the working side durign lateral movement of the mandible were found in all orthodontically aligned impacted canines. Half the aligned teeth were involved in canine guidance, half in group function. Balancing side interferences were detected in 22% of the cases. The result of this study revealed a nearly identical function in the aligned canines when compared with the spontaneously erupted canines on the other side of the same maxilla. This became apparent during lateral excursion of the mandible. The angle of mesiodistal inclination of the tooth central axis with an occlusal plane was 84 °, for aligned and 82 °, on average for the spontaneously erupted canines.
    Notizen: Zusammenfassung Ziel der Untersuchung war es, retinierte Oberkiefereckzähne nach chirurgisch/kieferorthopädischer Einreihung hinsichtlich ihrer Funtion bei der dynamischen Okklusion sowie ihrer Einstellung im Zahnbogen zu analysieren. Dazu wurden die Art der Laterotrusionsführung untersucht und vorhandene Balancekontakte registriert. Dies erfolgte sowhol am Patienten als auch im Artikulator, der jeweils entsprechend den Ergebnissen der Axiographie adaptiert war. Alle mobilisierten Eckzähne waren an der Führung des Unterkiefers bei der lateralbewegung beteiligt, und zwar in jeweils der Hälfte deer Fälle an einer Eckzahnführung (reine Eckzhanführung, Front-/Eckzahnführung, Eckzahndominanz) bzw. an einer Gruppenführung (partielle, totale). Balancekontakte wurden in vier von 18 Fällen registriert, in denen ein mobilisierter Eckzahn an der Laterotrusion beteiligt war. Diese Kontakte waren ausschließlich auf den zweiten Molaren lokalisiert. Die Achsen der eingereihten Eckzähne waren so eingestellt, daß eine Kronenneigung nach mesial vorlag. Insgesamt zeigte sich, daß die untersuchten kieferorthopädisch eingereihten Eckzähne den spontan durchgebrochenen Kontrollzähnen funktionell gleichwertig waren, was die unteersuchten Parameter betraf.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Reaction kinetics and catalysis letters 53 (1994), S. 309-316 
    ISSN: 1588-2837
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Isomerization of n-butane over bifunctional Pd-impregnated catalyst pellets consisting of molecular sieve SAPO-31 or SAPO-11 and a silica binder has been investigated. Pd/SAPO-31 converts n-butane to iso-butane at temperatures of 700–725 K with good selectivities (more than 70% at conversion levels of 35–40%). The high activity is attributed to the outstanding properties of medium pore SAPOs for catalyzing the skeletal isomerization of intermediate butenes, which is considered to be the critical step in the reaction sequence.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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