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Biomedical subjects

R Wächter

Publications and source records attributed to R Wächter.

26 records · Page 2Linked to original sources
PubMed1987

[Lipoma of the mammillary body].

A lipoma of the base of the brain, located at the right mammillary body, was unexpectedly discovered during the autopsy of a 73 year old man. Current theories concerning the development of intracranial lipomas are reviewed.

Aged↗
PubMedDate not supplied

Bridging lower jaw defects with AO plates: comparison of THORP and 3-DBRP systems.

Two reconstruction plate systems, the 3-dimensionally-bendable reconstruction plate (3-DBRP) and the titanium hollow screw and reconstruction plate (THORP) were compared in clinical use. Fewer complications in patients were observed with the THORP system than with the 3-DBRP system. In general, both systems are reliable and approved. In cases of extensive defects, however, the THORP system appears to be more effective because of its larger size and its better anchorage.

Bone Plates↗
PubMedDate not supplied

[Can steel screws be combined with titanium plates? Hard polishing technique and SEM in animal experiments].

To clarify the compatibility of steel and titanium, mandibular resections were performed on 24 sheep and the defects bridged with titanium plates and steel vs. titanium screws. 6, 12 and 24 weeks after osteosynthesis the implants were removed along with the surrounding bone segment and thin ground sections were prepared using the Donath method. The sections were then studied by light, fluorescence, polarization and scanning electron microscopy. The stability and easy removal are advantages of steel screws rendering them particularly suitable for temporary implantations. Moreover, they are 50-75% less expensive than titanium screws. After 3 and 6 months some minimum friction corrosion was observed at the screw/plate interface of steel screws. None of the specimens, however, showed signs of local tissue damage such as metallosis. From this it may be concluded that at least on a temporary basis a combination of steel screws and titanium plantes seems to be possible.

Animals↗
PubMedDate not supplied

[Tumor irradiation after plate osteosynthesis. Dose determination on radiological phantom].

An irradiation phantom was used to measure dose increases using the backscatter of different materials (titanium, steel, lead, aluminum). Telecobalt 60 and 8 MeV photons were used for the irradiation. The radiation dose was measured by means of a defined x-ray film blackening. The most important parameter was to find out whether under stimulated conditions the undesirable hot spots occur. We were able to demonstrate that a 12.5 to 16% increase of the radiation dose can be observed for titanium and steel at a distance of .45 mm from the metal specimen. A comparison between titanium and steel did not demonstrate a relevant advantage for titanium. Therefore adjuvant percutaneous radiation therapy should not have any influence on the life of the implant, if the soft tissue layer is of sufficient thickness. The available literature was reviewed and presented in tables.

Background Radiation↗