The authors first review the problems associated with inter-maxillary blockage and of classical methods of immobilisation used in all types of facial osteotomy. Their experience of osteosynthesis in traumatology has led them to use whenever possible osteosynthesis alone with screw fixed microplates. The other methods are used only as secondary assistance in the case of necessity. Osteosynthesis without blockage prevents recurrence and does not compromise the result as far as satisfactory dental articulation is concerned.