What must indirect-action films be used in conjunction with?

Indirect-action films require the use of intensifying screens because these screens convert the X-ray energy into visible light, typically in the form of green or blue light. When X-rays hit the intensifying screen, they stimulate the screen to emit light, which then exposes the film. This process significantly enhances the sensitivity of the film, allowing for a reduced amount of radiation exposure compared to direct-exposure films that do not utilize such screens.

The combination of indirect-action films with intensifying screens is crucial because it improves both the quality of the image and the safety of the patient by minimizing their exposure to radiation. This is particularly important in dental radiography where the delicate structures of the mouth and jaw are involved.

Using indirect-action films without intensifying screens would result in a less efficient imaging process, requiring higher doses of radiation to achieve similar quality images, which is not ideal for patient safety or diagnostic efficacy.