Clinical application of ultrasonography us in dentistry has been limited to the major salivary gland cervical lymph nodes facial musculature and surface soft tissues of the face and the neck however in recent years with the development of the high resolution ultrasound equipments attempts have been performed in imaging the early tongue carcinomas periapical lesions and temporomandibular joint disorders tmd. Ultrasonography us also known as real time echography or sonography is an imaging technique based on the propagation and reflection of ultrasound waves in the tissues the transducer includes an electrically stimulating piezoelectric crystal that converts electrical impulses to high frequency sound waves which are transmitted into the tissues being examined. Although dental ultrasonography has been studied for over 40 years most methods are not quite ready for routine clinical use and there remains much opportunity for diagnostic ultrasonography to