Journal of Korean Academy of Oral and Maxillofacial Radiology (치과방사선)

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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THE CHANGE OF FILM CHARACTERISTICS ACCORDING TO THE PROCESS OF USING TIME OF PROCESSING SOLUTION

현상액의 사용 시일 경과에 따른 필름 특성의 변화

  • Chung Moon Sung (Department of Dental Radiology, College of Dentistry, Chonnam National University) ;
  • Chung Hyun Dae (Department of Dental Radiology, College of Dentistry, Chonnam National University)
  • 정문성 (전남대학교 치과대학 치과방사선학교실) ;
  • 정현대 (전남대학교 치과대학 치과방사선학교실)
  • Published : 1992.06.01
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Abstract

This study was undertakened to investigate the change of image characteristics on dental films according to the process of using time of processing solution in automatic processor. Base + fog density, film density and subject contrast were measured with the digital densitometer, the pH of developing and fixing solution were measured with Digital pH / ION Meter. The following results were obtained: 1. Base + fog density was increased with the process of using time of the processing solution and was over the maximum permissible base + fog density 0.25 from the 3rd day. 2. Film density was increased with the process of using time of the processing solution. 3. Subject contrast was decreased with the process of using time of the processing solution. 4. The pH of the developing solution was decreased with the process of using time, the pH of the fixing solution was increased.

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