ABSTRACT
Six patients were treated by modified vertical ostectomy of the body of the mandible. The selection of vertical ostectomy operation for these cases was based on the presence of extremely long protruded mandible to the extent that any other operation as ramus techniques was inappropriate solution. The presented modified ostectomy of the body of the mandible overcomes the disadvantages of the original operation introduced by Dingman 1944. It provides better visibility of the surgical field, better access to excise any desired amount of bone, allows maximal bony contact for better bone healing and helps in strong anchorage of jaw segments to each other. This modified technique has been used successfully in six patients with extreme prognathic lower jaw ranging from 1.2 - 2.8 cm