[The use of TM HAKEN plate in craniofacial surgery].

Rigid internal fixation using mini/micro plate has become a frequent application in cranio-maxillo-facial surgery. In order to make plate fixation easier and reduce operative time, the TM HAKEN plate, a kind of micro plate, was devised which has a thorny HAKEN like an ice pick and applied to cranio-facial surgery. The plate is made of titanium, and th HAKEN and screw are made of titanium alloy. These allow contoured engagement in all three dimensions due to the flexibility of titanium, and firm fixation due to the physical strength of titanium alloy, resulting in minimized artifact on CT scan and MRI images. The fixation is accomplished by just driving in the plate with a hammer, and using screws. In the case of wide operative field, the plate is driven in directly, while in the case of small field, the plate is driven in with an impactor. TM HAKEN plate has been used for osteosynthesis in 39 cases of craniofacial surgery at the Department of Plastic and Reconstructive Surgery of Toho University Hospital between September 1992 and September 1994. Of the 39 cases, 19 were cranioplasty using frozen preserved auto-carvarial bone, 9 were midface fractures, 6 were fixation of free bone grafting, and 5 were fixation of artificial bone (hydroxyapatite-tricalcium phosphate composite ceramics) grafting. Satisfactory results were obtained in all cases without any difficult complications such as infection, exposure or migration. In addition, reliable post-operative evaluations and follow-ups were possible with reduced artifact on CT scan and MRI images.(ABSTRACT TRUNCATED AT 250 WORDS)