PubMed Health⌕ Search

Biomedical subjects

V Strunz

Publications and source records attributed to V Strunz.

34 records · Page 2Linked to original sources
PubMed1980

[Tissue substitution in experimental oral surgery from a general viewpoint of pathology].

In experimental maxillo-facial surgery the replacement of large pieces of bone as a substitute for tissue is of special practical interest. The various possibilities of the interaction and connection between transplants and alloplastic implants in the surgical bed especially in bone are demonstrated under the aspects of general pathology and some proposals are given for a more precise terminology in this field. The application of dynamic load to implants is shown to be a leading factor for the development of the special biotechnical structure of a neoperiodontal ligament during the regeneration of tissue in the case of the dental rod implant. Stimulation is given for the improvement and development of better allopastic implant materials yielding to a durable connection between bone and implant.

Animals↗
PubMed1978

[Coating of metal implants with the bioactive glass ceramics Ceravital].

The bioactive glass ceramic Ceravital forms a physicochemical bonding with bone which is capable of withstanding stress caused by tension. This glass ceramic may already be put to clinical use as replacement for minor osseous parts. However, physical data are limited for maximum stress withstanding or gracile whole ceramic implants. In this study, metal cylinders from an alloy of CoCrMo are initially coated with a bio-compatible adhesive layer of enamel, approximately 0,2 to 0,3 mm thick. The adhesive strength of this kind of enamel amounts to about 120 to 140 kp/cm2. After the enamelling process, the glass ceramic is pressed into the enamel in granules at a particle size of 100 to 200 micrometer. As the first results show, this new process is suitable for the combination of metal implant stability and tissue compatibility of glass ceramic.

Animals↗
PubMed1978

[Osteo-keramo-keratoprosthesis (author's transl)].

A high percentage of plastic keratoprosthesis is rejected again or intraocular infections occur because there is a cleft-like open junction between anterior chamber and lacrimal film. Only the ketratoprosthesis by Strampelli (1970) settles firmly in the cornea without the above risks, because the autogenous transplanted bone unites well with the grafted labial mucosa. 5 years of investigation have confirmed that glass ceramic Ceravital unites firmly with bones (Blencke et al. 1973, Strunz et al. 1977c, Bunte et al. 1977). For the osteo-keramo-keratoprosthesis Ceravital is used the same location as Dentin for the osteo-odonto-keratoprosthesis. The new surgical method has the advantage that 1. toothless patients can be operated, 2. the anterior chamber cannot flatten because the ceramic disk has the same shape as the corneal surface, and 3. broader optical cylinders can be used, by which a widening of the visual field is achieved.

Animals↗
PubMed1977

Ceramic augmentation of the lower jaw.

Atrophy of the lower jaw is essentially a manifestation of vertical bone resorption and must be treated in a compensatory manner. Animal experiments have shown the value of the bioactive glass ceramic Ceravital as a bone replacement material. After box-shaped or step-shaped osteotomies, we perform interpositional plastic operations with glass ceramic in order to augment the atrophied human lower jaw. Results, advantages and dangers of the method are shown in 12 patients.

Alveolar Process↗
PubMed1977

Surface staining of sawed sections of undecalcified bone containing alloplastic implants.

A simple new method is described for the histological evaluation of bones containing alloplastic implants of ceramic and/or metallic materials. The undecalcified bone is embedded in acrylic resin and sectioned at 50-200 micrometer using a sawing microtome. One surface of the preparation is stained up to 10 micrometer deep by floating the preparation on Giemsa stain. Other staining procedures are possible. Microscopic detail is satisfactory for histological and morphometric evaluation.

Animals↗
PubMed1977

[Jaw-enlargement with glass ceramics in the animal experiment].

The use of alloplastic material in the reconstruction of the defective or atrophic mandible appears obvious as the difficulties and risks of bone or cartilage transplants are well known. It appears that all the materials used up to now were demarcated by the bone as foreign bodies so that one could only observe strong union without a connective tissue line of separation with glass ceramics. In experimental operations in the pig, box shaped osteotomies were cut into the lower jaw and glass ceramic bodies were fixed into the clefts. Clinical and histological examinations proved the bone acceptance. It appears that these bio-active glass ceramics are particularly suited as bone replacement.

Animals↗
PubMed1977

[Comparative studies on the adhesiveness to the bone of various implantation materials].

After earlier experiments showed that bone became adherent to glass ceramic, the maximum mechanical stress on the bone-ceramic interface, as compared with polymethylmethacrylate (PMMA) and aluminium oxide ceramic, was investigated for shearing force and tension. Whereas the PMMA and aluminium oxide ceramic test objects which had been inclosed in the connective tissue were very easily pushed out without measurable pressure, the average fracture load for 15 smooth glass ceramic objects was 466 p/mm2 in the pushed out test and 167 p/mm2 in the tension test.

Adhesiveness↗
PubMed1977

[Staining of the surface layer in jaw tumors].

In the histological preparation for surface layer staining, saw cuts 100-300 micrometer thick of undecalcified bone or tooth are made with or without alloplastic implantation material. Only one side of the cut is stained for 4 hours. During this time the stain penetrates about 15 micrometer into the preparation. Deeper-lying cells and structures remain unstained and appear merely as shadows that are not troublesome. The time-consuming process of making thin sections is dispensed with and variously stained serial sections are possible.

Jaw Neoplasms↗
PubMedDate not supplied

[Biomechanic and histomorphometric studies of HIP titanium glass ceramic, a new implant material, compared with glass ceramics, titanium and titanium alloy].

Interfacial tensile strength and quantitative histomorphological properties of alloplastic implant materials for hard tissue application were studied in animal models. Physico-chemical bonding in the order of 1 N/mm2 of bone to glass-ceramic (Ceravital) was demonstrated independent of magnitude of surface roughness with mineralized bone in excess of 80% at the implant interface. No bone-bonding, but contact of mineralized bone at the metal surface was observed in pure titanium and titanium alloys (Ti6Al4V, Ti5Al2, 5Fe) with smooth surfaces. Rough or porous surfaced specimens, however, exhibited mechanical interlocking and interdigitation, thus yielding interfacial tensile strength of up to 4 N/mm2 in geometrically porous or madreporic surfaces. The new composite material HIP-Titanium-glass-ceramic (Ceravital) displayed physico-chemical bonding to bone as well as mechanical interdigitation within the secondary porous structure, thus giving support to expectations that HIP-Titanium-glass-ceramic coated implants should perform superior than bulk materials.

Animals↗