LIGHTENING OF DARK RADIOGRAPHS BY A SUPER PROPORTIONAL REDUCING AGENT
Abstract
Introduction. Occasionally over exposure or over development makes processed radiographs too dark, By reducing (Bleaching) such a radiograph whit a reducing solution the dentist can enhance the image with low diagnostic value.
Methods. Mandible of a dry skull with posterior teeth, double films pocket, intera oral radiography unit, diluted solution of fixer and developer, Coppor sulfate reducer solution, automatic processing unit. A radiograph was prepared with normal exposure time from posterior region of mandibule and saved as positive control. A series of double film pocket were exposed to obtian overexposed radiographs. One film from each pocket was used as the negative control and the other was reduced by copper sulfate solution. The diagnostic quality of reduced radiographs were evaluatel in three steps: 1. By clinical evaluation of reduced radiographs. 2. By densitometry of reduced radiographs. 3. By evaluation the number of steps wedges.
Results. The diagnostic quality and resolution of reduced Radiographs were increased and their contrast was decreased.
Discussion. Copper sulfate reducing agent is very good solution for improving diagnostic quality of very dark radiograph and prevent reexposure of the patient.
Methods. Mandible of a dry skull with posterior teeth, double films pocket, intera oral radiography unit, diluted solution of fixer and developer, Coppor sulfate reducer solution, automatic processing unit. A radiograph was prepared with normal exposure time from posterior region of mandibule and saved as positive control. A series of double film pocket were exposed to obtian overexposed radiographs. One film from each pocket was used as the negative control and the other was reduced by copper sulfate solution. The diagnostic quality of reduced radiographs were evaluatel in three steps: 1. By clinical evaluation of reduced radiographs. 2. By densitometry of reduced radiographs. 3. By evaluation the number of steps wedges.
Results. The diagnostic quality and resolution of reduced Radiographs were increased and their contrast was decreased.
Discussion. Copper sulfate reducing agent is very good solution for improving diagnostic quality of very dark radiograph and prevent reexposure of the patient.
Keywords
Lightening. Radiography. Super proportional, Sulfate solution?