Which factor does NOT contribute to poor contrast in dental x-rays?

The factor that does not contribute to poor contrast in dental x-rays is the film storage temperature. Contrast in radiographic images is mainly affected by the development process and the presence of scatter radiation.

When considering the other factors, chemicals used in processing can significantly impact image contrast by either enhancing or diminishing the visibility of structures on the film. The concentration of developer plays a crucial role as well; if the developer is too diluted or too concentrated, it can alter the contrast of the resulting image. Scatter radiation is another critical element that can reduce image contrast by creating a fogging effect, thereby obscuring the details that should be visible in the final radiograph.

Film storage temperature typically affects the film's sensitivity and can lead to fogging if stored improperly for extended periods, but it does not directly influence the contrast of an image in the way that the processing chemicals, developer concentration, and scatter radiation do.