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Biomedical subjects

A Tappe

Publications and source records attributed to A Tappe.

At least 37 records · Page 2Linked to original sources
PubMed1980

[The abrasion resistance of dental materials. 2. Improvement of abrasion resistance of tooth-colored plastics by means of combination with dental ceramics].

On the abrasion resistance of dental materials. Part II: Reduction of the abrasion of tooth-colored plastics as achieved by the simultaneous use of dental ceramic materials In vitro experiments showed that dental plastics being in contact with dental ceramic materials are abraded to a lesser extent than dental plastics in contact with dental plastics.

Dental Materials↗
PubMed1980

[Abrasion resistance of dental materials. 3. Surface quality study of Evicrol by wear measurements at different layer depths].

Abrasion determinations in various layer depths showed that the layer of the filling material Evicrol directly under the matrix-hardened surface is more abrasion-resistant than the matrix- hardened surface. From this it is concluded that it is good practice to overfill in making restorations of Evicrol and to remove a certain layer of material (approximately 0.25 mm, according to Fraunhofer).

Composite Resins↗
PubMed1979

[Comparative materials science studies of Evicrol plastic filling material].

The water absorption of Evicrol, its hardness, flexural strength and abrasion resistance were measured and compared with the values found for Adaptic and those for Kallocryl A as a non-filled polymethyl methacrylate plastic. The flexural strength and the abrasion resistance of Evicrol amount to those of Adaptic. The hardness of Evicrol falls also short of that of Adaptic. On the contrary, Evicrol behaves quite differently under water. It was found that the amound of water absorbed by Evicrol is some 3-fold greater than that absorbed by Adaptic, and that saturation is reached considerably slower.

Absorption↗
PubMed1978

[Technological and clinical studies on various plastic filling materials].

The authors determined the hardness, water absorption and thermal expansion of different composites. The clinical trial of two of these materials is followed by conclusions as to their use in practice. With regard to the anterior region, the composites are in a sense an enrichment of assortment of filling materials. But due to their still insufficient physico-chemical properties, they are no alternative of cast or amalgam fillings.

Composite Resins↗
PubMed1978

[The resistance to abrasion of dental materials].

Using a new method, the authors investigated the abrasion resistance of Kallocryl-A with regard to the kind of stress (abrasive or intermittent), the temperature, the depth of the layer of plastic and the number of abrasive movements. The results were analysed for significance by means of the t-test.

Dental Materials↗
PubMed1975

[A quantitative method for the measurement of the marginal space using Ca45].

A survey of the most known methods of testing for marginal fit is followed by the description of the determination of marginal leakage by means of autoradiography. 45Ca was used as a radioactive isotope. The most favourable times of penetration and exposure are indicated. Provided that certain standards are respected, the magnified autoradiograms may be measured and the values obtained can be used for comparisons. The applicability and the error range of the method were tested in 2 series of Super-Syntrex fillings.

Autoradiography↗