[The value of 3-dimensional model in the reconstruction of mandibular segment defect. Observations in a clinical case]. / Valoarea modelului tridimensional in reconstructia pierderilor de substanta segmentare ale mandibulei. Observatii pe marginea unui caz clinic.

The use of autogenous bone graft in the reconstruction of mandibular defects following tumor extirpation is a reliable method for further functional rehabilitation. The exact amount of bone needed for harvesting is usually achieved by estimation of the gap and direct measuring. We present the case of a 51-years old patient referred to our clinic for a recurrent mandibular keratocyst. Besides clinical examination, the diagnosis work-up consisted of ortopantomography and computertomography (CT). Based on CT images, a graphic reconstruction of the mandible was realized and a 3D negative template of the scheduled mandibular defect was printed. The tumor was removed by a segmental resection of the mandible, while a fragment of bone tissue similar to the 3D model was harvested from the iliac crest. This bone fragment replaced the mandible defect and was fixed by means of four plates and titanium screws. No postoperative complications occurred. The pathology result confirmed the diagnosis of keratocyst. In conclusion, this method proved to be useful for precise planning of the shape and size of the graft in addition to exact placement of the graft in an acceptable prosthodontically position for future dental implant rehabilitation.