File:Dental and oral radiography - a text book for students and practitioners of dentistry (1916) (14570808407).jpg

Identifier: dentaloral00mcco (find matches)
Title: Dental and oral radiography : a text book for students and practitioners of dentistry
Year: 1916 (1910s)
Authors: McCoy, James David
Subjects: Radiography, Dental X-rays Teeth Mouth
Publisher: St. Louis : Mosby
Contributing Library: West Virginia University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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introduced into the mouthand placed well down on the lingual side of thet^eth with a minimum amount of discomfort tothe patient. Where it is necessary to make a complete radi-ographic examination of the dental arches, it canbe accomplished in the average case, by makingsix exposures of each arch. The procedure to befollowed is diagrammatically shown in Fig. • v.The numbers l. ;;. 3, 4. 5, 6 indicate the positionof the x-ray tube in its relation to the dental arch,and the ends of the lines coming from the num-bers show the position of the mesial and distaledges of the film used for each exposure. It willnoted that each adjacent film position over- 92 DENTAL AND ORAL RADIOGRAPHY laps its neighbor which is advisable so that noarea is left out. In making radiographs of the anterior part ofthe arch, it is a mistake to attempt to radiographmore than two or three teeth at a time, as thecurvature of the arch usually renders it impos-sible to get more than that number free from dis-tortion.
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Fig. 38. Another point in technic which should not beoverlooked if sharp outlines are to be obtained,is the one in regard to having the tube placed atthe proper distance from the structures to beradiographed. To establish the best focal dis-tance for work about the teeth or jaws, the tar-get of the tube should be about twenty inchesfrom the plate or film. With a good x-ray machine, and a properly reg-ulated tube, good radiographs can be obtained by DENTAL AND ORAL RADIOGRAPHY TECHNIC 93 very short exposures, particularly by using theuitra-oral method, as the rays need only penetratea comparatively short distance before reachingthe plate. With the apparatus now availablegood radiographs can often be obtained by in-stantaneous exposures. However, instantaneousexposures are not necessary for good dental radi-ography. X-ray apparatus which is capable ofproducing sharp, clear uitra-oral radiographsin from two to five seconds, is efficient enough foruse in the x-ray laboratory of the dentis

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