. Elementary and dental radiography / by Howard Riley Raper . Fig. 117. Dental radiograph made with an intensifying screen. and try again. If the negative is too dark, and it has been left in theEastman developer only 5 minutes or the Brady developer only 4 or 6minutes, the exposure has been overtimed. making the negative. The subject of making negatives has already been covered fairlywell in Chapter IV. What developer shall we use? I obtained the Choice Of Developer, formulas for the developers used by twelve different radiographers, and they were all different! From this we may conclude that
. Elementary and dental radiography / by Howard Riley Raper . Fig. 117. Dental radiograph made with an intensifying screen. and try again. If the negative is too dark, and it has been left in theEastman developer only 5 minutes or the Brady developer only 4 or 6minutes, the exposure has been overtimed. making the negative. The subject of making negatives has already been covered fairlywell in Chapter IV. What developer shall we use? I obtained the Choice Of Developer, formulas for the developers used by twelve different radiographers, and they were all different! From this we may conclude that any clean, properly mixed developer will do the work. However, I would advise the beginner to use one of the developersjust referred to in the foregoing, i. e., a developer which will have thedesired action in a knozvn length of time. When making the developing MAKING DENTAL RADIOGRAPHS 129. Fiy. IIS. Dark box for use where a dark loom is not available. solution, dissolve the light powder first, then the heavier, white the operator becomes acquainted with the technic of development hecan correct slight mistakes in exposure by leaving the plate, or film, in thedeveloper, say, for example, only 4 minutes in the 5-minute developerfor overtimed films, or 7 minutes for undertimed films. It is unnecessaryto leave any plate or film in the 5-minute developer longer than 10minutes. If the image does not appear as it should in 10 minutes itnever will; a longer exposure must be made. If at all possible it is desirable to have a dark room, but if such aroom is not available, a dark box may be used. Fig. 118. Figure 119 illustrates a satisfactory method of hanging film negativesup to dry. 130 DENTAL RADIOGRAPHY To expedite handling it, when the film negative is dry it may bemounted between 2 pieces of clear glass using passe-partout strips to bindthe pieces of glass together
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