Interpositional Bone Grafts
Maxillary interpositional bone grafting maintains the blood supply to the repositioned portion of the maxilla and generally results in more predictability with less extensive resorption postoperatively. Interpositional bone grafting in the maxilla is indicated in the bone-deficient maxilla, where the palatal vault is found to be adequately formed b ut ridge height is insufficient tparticularlv in the zygomatic buttress and posterior tuberosity areas and when excessive interarch space eXists).cl Anteroposterior and transverse discrepancies between the maxilla and mandible can also be corrected by interposrtlonat bone-grafting techniques (Fig. 13-35). Interpositional grafting techniques provide stable and predictable results by changing the rnax illary posttion ill the vertical, anteroposterior, and transverse directionscine! may eliminate the need for secondary soft ~j sue procedure . Disadvantages of this type of procedure include the need to harvest bone from an- iliac crest donor site • and possible secondary soft tissue surgery.