Biomedical subjects
D Heidemann
Publications and source records attributed to D Heidemann.
[Enamel margin preparation of anterior and posterior tooth cavities--new concept instrument].
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[Cooperation and work of dental assistant in care of filled teeth and in endodontics (1)].
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[Cooperation and work of dental assistant in care of filled teeth and in endodontics (2)].
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[Cooperation and work of dental assistant in care of filled teeth and in endodontics (3)].
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[Hand instruments for cavity preparation].
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[Root canal filling--manual and mechanical methods].
A satisfactory apical seal can be achieved with all the methods listed in this article. The result depends on the experience and skill of the operator using his or her standard method. One single method, however, does not always adequately meet the requirements arising from the morphology of the canals, the alignment of the tooth in the dental arch, jaw opening, and the conditions governing the preparations of the root canal. The time saving aspect favors the use of engine-driven instruments. The use of thermomechanical methods and the injection method is limited in the posterior jaw area. Similar to preparation, all methods present difficulties in handling certain situations, such as narrow, curved canals, or wide open foramina in straight canals. The so-called standard methods of manual techniques provide reliable good results in almost any situation.
[Contact pattern of cultivated gingiva cells on different substrates].
The question of contact with the surface of biomaterials has not been fully elucidated. The importance of the surface structure continues to be discussed in terms of the roughness profile. However, it can be demonstrated that surface structure alone is not the crucial parameter for the adhesion or the lack of adhesion of cells. Probably factors like serum coating of a substrate and fibronectin formation of cells are at least as important, if not decisive preconditions for cell adhesion and in particular for the active spreading of cells in contact with biomaterials.
[Axial compressive strength of amalgam fillings in correlation with cavity preparation].
UNLABELLED: Different types of cavities were prepared in 96 model teeth: simple preparations without ledges and with Amalgapins, slots or a post; proximal box preparations with an occlusal ledge, and box preparations with or without Amalgapins or slots. The amalgam fillings were subjected to axial load by means of a Zwick machine until the filling or the tooth fractured. RESULTS: --Occlusal ledges and box preparations allow high load values. --Surprisingly high loads can be placed on simple preparations without ledges but with a post. --Preparations without ledges but with Amalgapins or slots rate lowest. --In box preparations and preparations with ledges, Amalgapins or slots fail to offer any significant increase in compressive strength.
[Life threatening laryngeal edema after minor dental treatments in hereditary angioneurotic edema].
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[Cell culture of human gingival epithelium].
Gingival explants were taken from 8 volunteers in order to find a method to grow gingival epithelial cells. We succeeded in what we regarded as optimal conditions in achieving a monolayer cell thickness in the culture by means of BHK medium and foetal calf serum.
[Effect of local hemostyptics on human gingiva fibroblasts in culture].
Local hemostyptics and materials for filling surgical defects are frequently used by dentists after extractions and in the treatment of cystic cavities. Three of these materials, Kollagen Vlies, Tabotamp Gaze, and Gelita Tampon were studied in cultures of human gingiva fibroblasts for their biological tolerance.
[Comparison of the biological tolerance of titanium and titanium alloys in human gingiva cell cultures].
Mirror-finished solid specimens of pure titanium and the titanium alloys Ti-6Al-4V as well as Ti-5Al-2.5Fe showed no effects on the growth behavior and cell morphology of human gingival epithelial cell and fibroblast cultures. The growth of the cells contacting all three materials was uninhibited. SEM revealed growth of fibroblasts on the surfaces of the specimens, too. No differences could be found between the biocompatibility of titanium alloys and that of pure titanium. The formation of a stable surface oxide layer providing resistance to corrosion may be decisive.