Abstract: An intraoral dental imaging system employs a service unit having a power supply and a light source, and selectively using a video camera having a plug-in module for releasably connecting the video camera to the power supply, or an x-ray camera having a second plug-in module for releasably connecting the x-ray camera to the power supply. In either case the modules have processing means for producing video output signals. These video output signals may be sent to a wide variety of devices connected to the service unit. For instance, they may be used to display an image on a video monitor, such as a CRT, they may be sent to a printer for printing, and they may be sent to a modem for eventual display at another location. In essence, these video output signals may be sent to any device known in the art. Thus, the plug-in modules are highly portable while allowing for interchangeability within the same service unit, thereby allowing a practitioner to use the modules in multiple operatories.