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Show Columbia U. Takes New Step Toward 'Painless Dentistry' NEW YORK. A new step toward "painless dentistry" seems to have been taken by a Columbia university professor here. The latest development Is the discovery of Dr. L. L. Ilartmnn of a "desensltizer" that does away with the painful sensations during the necessary drilling before a cavity cav-ity In a tooth can be filled. The desensltizer which Doctor Hartmaff discovered after nearly twenty years of research Is a colorless color-less fluid. Unlike other anesthetics anesthet-ics which must be Injected Into the nerves or plugs of the teeth, Doctor Hartman'8 fluid Is applied to the dentin, the substance which forms the bulk of the hard part of the teeth. It takes a minute or a minute min-ute and a half to take effect and the paln-kllllng effect lasts from twenty minutes to an hour, giving plenty of time to prepare almost any cavity for filling, Doctor Ilart-man Ilart-man explained. There are no unpleasant un-pleasant after effects and the pulp of the tooth remains normal. The chemical composition of the desensltizer has not been announced and the fluid Is still nameless. |