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Biomedical subjects

A J Held

Publications and source records attributed to A J Held.

At least 37 records · Page 2Linked to original sources
PubMed1976

[The evolution of implantology --trends toward a new concept].

The development if implantology during the recent years, relative to the tissue tolerance of various implant materials seems to have improved the chances of success. The disastrous results of prior years have been due to improper techniques leading to unstable biostability between tissue and implant material surface. This insufficiency of biocompatibility is not only biochemical, but also biomechanical as a consequence of very differing physical properties of osseous tissue and implant material. By increasing the surface of the implant material, making it porous, a penetration of fibres and a neoformation of bone could be observed. Thus a conjunctive attachment forms thus securing a closure of tissue around the emerging abutments. At this level, the implant must be considered under the periodontal angle. Marginal irritation must at any price be avoided, thus reducing the chance of epithelial growth into depth. Materials responding to the demands of biocompatibility are certain forms of porcelain, vitrified carbon, titanium, calcium aluminate.

Alveolar Process↗
PubMed1975

[Apicoectomy and focal diseases].

The so-called focal infections are today considered to be polyetiologic manifestations, in which there is a summation of various aggressions. Bacterial products, toxic or antigenic substances originating from different foci are but one of the elements susceptible of unleashing the disease. This explains why there are so many foci and so few results after their elimination. Scientific evidence shows that the histologic result of an apicectomy is considerably worse than the radiological evidence might lead to believe. Inflammation may persist for years before it disappears. Radiographs are therefore only a coarse criterion for judging results of healing. When facing a disease caused by focal infection, the possible foci should be eliminated quickly and as radically as possible.

Apicoectomy↗