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At least 19 recordsLinked to original sources
PubMed1978

[Surface studies on endosseous aluminum oxide-ceramic implants].

Implants performed without bone cement are predominantly influenced by the border surface between working material and tissue. A study of the surface of the ceramic implant in correlation with the tissue reaction should give an understanding of the kinetics of attachment. Sensitive methods of investigation which give reproducible results are required. In this connection several methods are described and discussed.

Aluminum Oxide↗
PubMed1978

[Endosseous aluminum oxide-ceramics implantations. The activities of a work group sponsored by the county government of Baden-Württemberg].

Emanating from the recognition of the favourable body tolerance of some ceramic substances in the U.S.A., investigations were started in 1970 with a view to the possibilities to improve endoprosthesis of joints by the use of Al2O3 ceramics. The experience collected brought a new insight into bio-mechanically based reactions occurring in osseous tissue bordering the implant. Their use in tooth implants led to corresponding adaptations of implant forms.

Aluminum Oxide↗
PubMed1978

[Light and scanning electronmicroscopic studies of border surfaces of aluminum oxide-ceramic implants in the dog mandible].

The mandibular bone of beagles as well as foxhounds and the border surfaces in the area of implants of dense Al2O3 ceramic were examined by scan electron microscope and optically in undecalcified preparations 4 and 6 months after the start of the experiment. All implants healed without foreign body or inflammatory reaction and exhibited a firm contact with the newly-formed surrounding osseous tissue. The border surface was always formed by osseous tissue and bone marrow and not by connective tissue. The bony border surface presented a casting of the structure proper of the ceramics as well as orderly remodelling. The tooth implants which had in part been under strain for a long time were surrounded by newly formed osteoid bone and supported by bone trabeculi. In the immediate proximity of the surface of the ceramic vital osteophites were found. The gum which was placed in a groove of the step implants showed firm epithelial covering and orderly fibrous texture.

Aluminum Oxide↗
PubMed1978

[The effect of the shape of aluminum oxide-ceramic implants on its staying power in the dog mandible].

Investigations were carried out on implants of Al2O3 ceramic as secondary single toothe replacement in the lower jaw of young Beagle test dogs. Two basically different forms with altogether 7 variations were tested: the first three types of implants had conical roots and a further 4 had cylindrical roots. Common to all 7 types was an implantation shoulder which was tested for its ability to conduct the masticatory force via the cortical substance to the mandibular bone. All implants are at least under indirect masticatory strain; type 80-40-027-00 was directly under strain: part of the implant, shaped like a premolar protrudes through the gum directly into the oral cavity. Preliminary results show that cylindrical root shapes stood the test well. Their length was of no great importance. Conical root shapes without special provision of retention are not suitable. Firm positioning of the implant during introduction is of prime importance. A cortically placed implantation shoulder is not suitable for the conduction of the masticatory pressure into the mandibular bone in dogs.

Aluminum Oxide↗
PubMed1978

General methodology for the estimation of common neutral urinary steroids by multi-columin liquid chromatography.

A method is described for the estimation of common neutral urinary steroids by multi-column liquid chromatography. Hydrolysis is performed in two steps: enzymatically, using beta-glucuronidase, followed by solvolysis. Initial short column chromatography separates the neutral steroids into three fractions according to polarity: 17-oxosteroids, corticosteriods less polar than cortolones, and cortolones and cortols. The cortolone, cortol fraction is oxidized and the different steroid groups are chromatographed on capillary aluminum oxide and silica gel columns. A computerized, spectrophotometric system is used for the quantitation procedure.

17-Ketosteroids↗