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What is How many Champy's osteosynthesis lines exist behind and in front of mental foramen? and explain in detail?
Champy described the ideal osteosynthesis lines, which were the areas in mandible which if plated correctly with mini plates and screws, could give adequate functionalstability to the mandible. These were 2 lines in the symphysis and para-symphysis region (anterior to the mental foramen) and 1 line in the body region that curved upward along the external oblique ridge to the anterior border of ramus in the angle region (behind mental foramen). If mini-plates with at least 2 mono-cortical screws of adequate thickness on each side of racture line were applied in these areas, it could give a semi rigid or a functionally stable fixation to the patient without the need of IMF.