Dental and oral radiography - a text book for students and practitioners of dentistry (1916) (14570820347)

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

Text Appearing Before Image:

the negative may bestudied under a degree of light to bring out themaximum amount of detail. Xow with a print or lantern slide one can ex- 130 DENTAL AND ORAL RADIOGRAPHY amine the field from only a one light aspect, andoftentimes in order to secure any degree of de-tail in the lighter or less dense areas, it will befound that the dense areas must be printed al-most to an inky blackness. It should be obvious. 1 / 18PH h£~ 1 Fig. 52. This radiograph shows an impacted upper third molar. The outline of theantrum is also plainly visible above the molars and bicuspids. therefore, that a single-phase print, or a nega-tive, examined under ordinary conditions, cannotapproach the various and comprehensive effectswhich are brought out by means of an illuminat-ing: cabinet. INTERPRETATION OF RADIOGRAPHS 131 In examining intra-oral radiographs, it is anadvantage to place them in a film mount whichwill hold them securely and render it unnecessaryto view them while being held between the fingers.

Text Appearing After Image:

Fig. 53. A cuspid tooth lying against the anterior wall of the antrum. It will benoted that the cuspid is inverted in its position. Such a mount should preferably be made ofcelluloid with one side clear and the other sidedull, which allows the light transmitted to be of 132 DENTAL AXD ORAL RADIOGRAPHY the same character as that coming through groundglass. In examining negatives, we should bear in mindthe fact that very dense tissues are characterisedby white areas, while less dense tissues appeardarker, and the absence of tissue is indicated byblackness. To avoid confusion, we should remem-ber that in prints and lantern slides this colorspectacle is reversed.

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1916

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