[Problems in the so-called root canal therapy--recommendations for the practice].
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Humans↗
Biomedical subjects
M Held
Publications and source records attributed to M Held.
[Experimental studies on metabolism in hard structures of the teeth. 1. Metabolism of niobium-95 in soft and hard tissues; studies on the Syrian golden hamster].
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Animals↗
[Studies on the diffusion of mercury from silver-tin amalgam fillings by means of Hg203].
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Animals↗
Biocompatibility testing of new polymers in a moving implant bed.
Total reconstruction of the auricle requires a skillful surgical technique and an appropriate material for the shape-supporting frame. Up to now, there is no such material apart from autologous rib cartilage. The combination of chronic microtraumatization of adjacent tissue caused by the mobility of an implant bed such as the auricle and the foreign-body reaction to currently available artificial polymers frequently results in extrusion. In our animal model (rats), polymers of different elasticity were implanted in a moving implant bed to analyse differences in foreign-body reaction related to implant elasticity. The results were significantly better for a rather stiff control material (porous polyethylene). A contributing factor may be better fixation of the implant material by tissue ingrowth into its micropores.
Animals↗
Multiple localized root agenesis.
The cause of this condition is undetermined. Cessation of root development is associated with a variety of systemic, congenital or genetic disorders. External trauma, such as radiation and electrical burns, can arrest development.
Adolescent↗