Benefits of stereolithography in orbital reconstruction.
OBJECTIVE
To describe the benefits of the stereolithography (SLA) modeling system in the evaluation and surgical planning of selected bony orbital pathology.


METHODS
Two case reports.


METHODS
One patient presented with a displaced left orbital roof fracture into his orbit causing globe compression and binocular vertical diplopia. A second patient underwent removal of his right orbital floor, medial wall, and inferior portion of his lateral wall during excision of a cylindrical cell papilloma of the paranasal sinuses. Postoperatively, he suffered from globe ptosis and binocular oblique diplopia.


METHODS
Stereolithographic models of the patients' orbits were obtained from computed tomography data to better assess the bony orbital pathology. In the second patient, the model was used as a template to create a temporary custom fit prosthesis to repair the defect of his orbital walls.


RESULTS
The SLA models were useful in evaluating the dimensions of the bony defects and in preoperative surgical planning. Intraoperatively, the SLA models facilitated orbital surgical rehabilitation. Postoperatively, both patients noted resolution of their diplopia after reconstruction of more normal bony anatomy.


CONCLUSIONS
In selected cases, SLA offers highly accurate models of the bony orbit for preoperative evaluation, surgical planning, and teaching and can act as a template for custom prosthesis manufacturing. This technology increases the orbital surgeon's options in managing complex orbital pathology.
Holck
D E
DE
Department of Ophthalmology, Wilford Hall Medical Center, San Antonio, Texas 78236-5300, USA. holck@lafb.af.mil
Boyd
E M
EM
Ng
J
J
Mauffray
R O
RO
D000063:Accidents, Traffic; D000328:Adult; D017076:Computer-Aided Design; D004172:Diplopia / Q000209:etiology; D005592:Fracture Fixation; D006801:Humans; D008297:Male; D008444:Maxillary Sinus Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008953:Models, Anatomic; D009915:Orbit / Q000000981:diagnostic imaging / Q000293:injuries / Q000601:surgery*; D009917:Orbital Fractures / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D010212:Papilloma / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D010347:Patient Care Planning; D019651:Plastic Surgery Procedures / Q000379:methods*; D014057:Tomography, X-Ray Computed