ABSTRACT
Dental radiography was one of the very early medical applications of X-rays with William Morton reading a paper on the subject to the New York Odontological Society on April 24th 1896. 'The density of teeth is greater than that of bone, and for that reason, pictures of the living teeth may be taken by the X-ray even of wandering fang or root, however deeply imbedded in its socket. Six years later in 1902, Francis Williams of Boston was dwelling on the difficulties. 'For the successful use of X-rays in dentistry, sharp definition in negatives is necessary, and differentiation is required between tissues that do not suffer very much in the obstruction they offer to the passage of the X-rays. However, Williams recommended a particular design for a dental X-ray tube. 'For good differentiation between tissues that are not very different in permeability the tube must have a low resistance.'
