Christian Jochum

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The influence of various ultrasonic devices for cleaning teeth on the surfaces of different filling materials was studied in 300 extracted teeth. Special attention was directed to the cavity edge and the area immediately surrounding it. Alterations in surface roughness were determined and compared with an electromechanical stylus. The inflicted damage(More)
This paper deals with the sound quality of electro-larynx devices, which is one method of communication for people who have lost their larynx. Current commercially available devices are characterized by an unnatural, mechanical sound. Assuming the availability of a linear transducer several alternative excitation signals are compared to the sound of a(More)
J. Dugundji Department of Mathematics, University of So. Cal., Los Angeles, CA. 90007, USA Z. Naturforsch. 37 b, 1205-1215 (1982); received April 5, 1982 Chemical Topology, Structure Correlation, Measure of Chemical Similarity, Quality of Syntheses, Shortest Reaction Pathways The principle of minimum chemical distance (PMCD) is derived from the general(More)
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