Panoramic X-ray basically gives a single image of the entire mouth, including the lower and upper jaws. The X-ray gives a flat image of the curved jaws which makes it easier for the dentists to analyze them. However, cavities cannot be traced easily with this X-ray as the detail needed to find cavities is not there in this type of X-ray. It helps when the dentists suspect any condition or if you are about to undergo treatments like braces, implants, etc.
Panoramic x-ray gives a comprehensive view to the dentist of your entire mouth. This is an extraoral procedure, which means the entire process is done with machines that are placed outside your mouth. The process involves projecting a beam through the mouth onto a film that rotates opposite to that of the X-ray tube. This X-ray shows the entire mouth in one picture which means that many oral problems can be detected with this one. So if your dentist suspects dental problems they would ask you to undertake a panoramic X-ray. Depending on the results of the X-ray, they will formulate the right treatment plan for you. This imagery method helps the dentist to undergo treatment like braces, implants, dentures and so on.