All of the movements of a rigid body in three dimensional space may be expressed with six numbers. Three numbers are required to specify the position of an object (i.e. the X, Y, and Z coordinate location) and another three numbers are required to specify rotational orientation (i.e. roll, pitch, and yaw). A commercial device is available which electronically senses each of these variables of three dimensional rigid motion. The first part of this subproject will be to measure the relative rigid motions in dental model simulations of craniofacial surgery and relate these rigid motions to the anatomic bone movements they would produce as registered in a three dimensional cephalometric or CT based surgical simulation. In this way operations wherein large skeletal sections are moved in concert with the teeth, can be evaluated as to whether the desired occlusal change is consistent with the necessary anatomic skeletal change which would be produced. This should aid significantly in more precisely planning such procedures and identifying cases in which more osteotomies between fragments are required to resolve the discrepancy between the desired occlusal and skeletal change. Positioning a three dimensionally mobile fragment correctly under an extremely edematous soft tissue envelope is difficult to do with precision. Use of this six dimensional electronic caliper in the operating room may be of use in correct positioning of bone fragments.

National Institute of Health (NIH)
National Institute of Dental & Craniofacial Research (NIDCR)
Research Program Projects (P01)
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Bookstein, F L; Grayson, B; Cutting, C B et al. (1991) Landmarks in three dimensions: reconstruction from cephalograms versus direct observation. Am J Orthod Dentofacial Orthop 100:133-40
McCarthy, J G; La Trenta, G S; Breitbart, A S et al. (1990) The Le Fort III advancement osteotomy in the child under 7 years of age. Plast Reconstr Surg 86:633-46;discussion 647-9
Stuzin, J M; Cutting, C B; McCarthy, J G et al. (1988) Radiographical documentation of direct injury of the intracanalicular segment of the optic nerve in the orbital apex syndrome. Ann Plast Surg 20:368-73
Cutting, C B; McCarthy, J G; Karron, D B (1988) Three-dimensional input of body surface data using a laser light scanner. Ann Plast Surg 21:38-45
Grayson, B; Cutting, C; Bookstein, F L et al. (1988) The three-dimensional cephalogram: theory, technique, and clinical application. Am J Orthod Dentofacial Orthop 94:327-37
LaTrenta, G S; McCarthy, J G; Cutting, C B (1987) The growth of vascularized onlay bone transfers. Ann Plast Surg 18:511-6
Dufresne, C R; McCarthy, J G; Cutting, C B et al. (1987) Volumetric quantification of intracranial and ventricular volume following cranial vault remodeling: a preliminary report. Plast Reconstr Surg 79:24-32
Grayson, B H; Bookstein, F L; McCarthy, J G (1986) The mandible in mandibulofacial dysostosis: a cephalometric study. Am J Orthod 89:393-8
Cutting, C; Bookstein, F L; Grayson, B et al. (1986) Three-dimensional computer-assisted design of craniofacial surgical procedures: optimization and interaction with cephalometric and CT-based models. Plast Reconstr Surg 77:877-87
Pensler, J; McCarthy, J G (1985) The calvarial donor site: an anatomic study in cadavers. Plast Reconstr Surg 75:648-51

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