An Orthopantomogram, also known as OPG is a two-dimensional panoramic scanning dental x ray of the upper and lower jaws and its surrounding structures. It is the primary diagnostic imaging tool used by dentists to provide information on the maxillary and mandibular structures prior to any dental procedure. Its use encompasses all specialties in dentistry, from surgery to restorative dentistry. Its use can’t be utilized unless the dentist fully understand what can be seen in dental radiograph.

Because it is only two-dimensional representation of the three-dimensional structures of oral and maxillofacial region, superimpositions of the hard and soft tissues are common. The clinician must overcome this before he/she can ascertain whether a structure is pathologic or not.

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