Histologic and microradiologic comparison of block and particulate cancellous bone and marrow grafts in reconstructed mandibles being considered for dental implant placement.
OBJECTIVE
Patterns of healing were investigated in mandibles reconstructed with three different techniques to assess their readiness for implant placement.


METHODS
The subjects were 10 patients who had undergone mandibular reconstruction with either nonvascularized iliac block bone grafts (group 1; 3 patients), particulate cancellous bone and marrow (PCBM) grafts (group 2; 3 patients) for mandibular discontinuity, or PCBM grafts for mandibular marginal defects (group 3; 4 patients). Six (groups 2 and 3) or 12 months (group 1) after mandibular reconstruction, bone biopsy specimens were obtained for histologic examination with a trephine bur. As controls, bone specimens were obtained from ungrafted mandibles of patients undergoing dental implant placement. Undecalcified specimens were embedded in polyester resin and examined by routine light microscopy and microradiography.


RESULTS
The morphology of the specimens from group 1 was similar to that of group 2, but not to that of the control subjects. However, the morphology of specimens from group 3 was generally similar to that of control subjects.


CONCLUSIONS
These results suggest that mandibular reconstruction with PCBM grafts allows the placement of dental implants sooner than reconstruction with block bone grafts.
School of Dentistry, Showa University, Tokyo, Japan.
T
T
Shirota
K
K
Ohno
M
M
Motohashi
K
K
Michi
D000328:Adult; D000368:Aged; D016026:Bone Marrow Transplantation; D001861:Bone Regeneration; D016025:Bone Transplantation / Q000379:methods*; D002294:Carcinoma, Squamous Cell / Q000601:surgery; D003758:Dental Implantation, Endosseous; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery*; D008339:Mandibular Neoplasms / Q000601:surgery; D008875:Middle Aged; D011379:Prognosis; D014945:Wound Healing