. Dental and oral radiography : a textbook for students and practitioners of dentistry . the upper and lower jaws from the cuspidregion anteriorly to the angle of the jaw posteriorly, andfrom the floor of the orbit above to the inferior marginof the mandible below. In fact, it is possible by makingseveral exposures to obtain in detail a shadowgraphicrepresentation of the dental apparatus in toto, as wellas its associated organs and structures, the nasal cavityand pneumatic sinuses, the maxilla and the mandible. It should be apparent to anyone that the first methodgreatly reduces the possibilit
. Dental and oral radiography : a textbook for students and practitioners of dentistry . the upper and lower jaws from the cuspidregion anteriorly to the angle of the jaw posteriorly, andfrom the floor of the orbit above to the inferior marginof the mandible below. In fact, it is possible by makingseveral exposures to obtain in detail a shadowgraphicrepresentation of the dental apparatus in toto, as wellas its associated organs and structures, the nasal cavityand pneumatic sinuses, the maxilla and the mandible. It should be apparent to anyone that the first methodgreatly reduces the possibilities of the x-ray. Both meth-ods have their advantages and neither should be dis-carded in favor of the other. 82 DENTAL AM) OKAL KIUAPII V Intra-oral Method We shall first discuss the intra-oral method by whichsmall areas are radiographed. First of all, the patientshould be placed in a comfortable position, and the headsupported so that it may be held perfectly still. Afterthe tube has been tested out and the proper degree ofvacuum established, the tube stand (complete with the. Fig. 37.—The patient can hold the film in position against the upper teeth by exerting slight pressure with the thumb. other apparatus before described) is moved to a positionwhere the rays coming from the tube, through the com-pression diaphragm and cylinder can be made to passthrough the desired areas and cast their shadows uponthe small him within the mouth (Fig. 37). In using this method upon the upper teeth, the great-est care must be exercised if the shadows produced arefree from distortion, for the film must be held within theupper arch against the lingual side of the teeth and thepalate, and must occupy a position which is in a different DENTAL AND ORAL RADIOGRAPHY TECH1STIC 83 plane from that occupied by the roots of the teeth. When-ever it is necessary to direct the rays upon structures thatlie at an angle with the plate or film, correct shadowsmay be obtained by adhering to the follow
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