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Surgical ablation of tumors within the oral cavity results in a three-dimensional defect and a potential puzzle for the reconstructive surgeon. Although a myriad of papers discussing the relative advantages and disadvantages of various methods of reconstruction are readily available for consultation, very few publications have provided the surgeon with a guide either to visualization of the defect or to how to reconstruct a three-dimensional defect with an essentially two-dimensional flap. Our intention is not to provide the answer for every oral reconstructive problem—after all, no two patients are alike—but we will demonstrate that an appreciation of the defect in three-dimensions, together with an understanding of oral function, provides a template for flap design and inset. This is achieved by simplifying the complex anatomical shape of the oral cavity into a geometric form from which a series of simple, easily recognisable shapes can be derived and assembled as necessary into a pattern that reproduces the defect, providing a template for flap design and inset. © 1994 Wiley-Liss, Inc.

A variety of osteoplastic flaps have been devised for transoral or extraoral access to the base of skull and the upper anterior cervical spine. Part I of this two-part review describes access to the clivus and upper anterior cervical spine. Part II will describe access to the middle cranial fossa, the infratemporal fossa and the pterygoid (retromaxillary) "space".