. Elementary and dental radiography / by Howard Riley Raper . ush. 128 DENTAL RADIOGRAPHY Unless the reader desires to master the methodPertinent JIdPice, of determining the time of exposure by the milli-ampere-second method (see Appendix to Chap. V,Page 355) the most practical advice I can give is: Learn from themanufacturer of the coil where to set the rheostat and the timehe considers right for dental radiographs. Make an exposure, giv-ing the time of exposure advised. Develop the film in EastmanM. Q. tube developer, 6 fluid ounces of water to the tube of devel-oper, for 5 minutes; or use t
. Elementary and dental radiography / by Howard Riley Raper . ush. 128 DENTAL RADIOGRAPHY Unless the reader desires to master the methodPertinent JIdPice, of determining the time of exposure by the milli-ampere-second method (see Appendix to Chap. V,Page 355) the most practical advice I can give is: Learn from themanufacturer of the coil where to set the rheostat and the timehe considers right for dental radiographs. Make an exposure, giv-ing the time of exposure advised. Develop the film in EastmanM. Q. tube developer, 6 fluid ounces of water to the tube of devel-oper, for 5 minutes; or use the Brady four-minute developer for 4minutes, or the Brady 6-minute developer for 6 minutes. Removefrom the developer, dip in water and fix in the fixing solution. Now thenif the film is too pale, as it probably will be—for most manufacturersseem to think their coils will make dental radiographs in shorter ex-posures than is really necessary or best—increase the time of exposure, oradvance the rheostat, or shorten the distance between the target and film. 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
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