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[Hyperplasia of the coronoid processes causing limitation of mouth opening. A report of 4 cases].

Four cases of subtotal clamping of the jaws caused by bilateral hyperplasia of the coronoid processes are reported. The aetiopathogenetic theories are examined and clinical cases and therapy described. It is concluded that treatment can only be surgical because the mechanical obstacle between the lengthened coronoid apophysis and the internal surface of the malar bone has to be removed.