Avaliação objetiva da qualidade do filme Contrast® FV-58 em soluções frescas e degradadas

Abstract

The use of intraoral radiographs is quite common in daily practice of dentistry and the radiographic film has been the most used means of capture, disposal and storage of radiographic images. However, X-ray emission can produce deleterious biological effects. One of the easiest ways to reduce the radiation needed to produce radiographs is the use of more sensitive films. The choice of these films is essential, since the radiographic quality is not compromised. The films have different behaviors in the changing of the type of processing, concentration, temperature and state of degradation of processing solutions. This study aimed to evaluate the F-speed film DFL Contrast® FV-58 and compare it with the Kodak Insight® E/F speed film. The parameters studied were the sensitometric properties, the relative contrast and base plus fog density. These parameters were calculated from values of optical density and the sensitometric properties used also measures of radiation dose. In order to observe the behavior of the films in fresh and degraded solutions, a model of degradation was created that lasted four weeks. The quality parameters were measured at five different times and the results showed that the Contrast® film has sensitivity, contrast and base plus fog density significantly higher, whereas the values of latitude are minor. The relative contrast showed no significant difference between the types of film. The degradation time of processing solutions were not significant in the parameters studied. It was concluded that the claims of the manufacturer of the film Contrast® is correct and confirm the characteristics of film, the highest sensitivity and contrast that the Insight® film