[CT multiplanar image anatomic study on orbital bone used for implant operation].

OBJECTIVE: To evaluate the orbital bone quantity by spiral computer tomography (CT) for orbital implant operation. METHODS: Fifty-two normal skull specimens with marks received spiral CT scan and their multiplanar images were obtained. The quantity (length x width) were measured on multiplanar images. RESULTS: The right orbital bone quantity at 7:00 was the highest, average 11.91 mm x 8.38 mm, and at 3:00 was the lowest, average 2.31 mm x 1.34 mm. The left orbital bone quantity at 5:00 was the highest, average 12.03 mm x 8.56 mm, and at 9:00 was the lowest, average 2.44 mm x 1.29 mm. There had no significance correlation with gender at the same position in both sides. CONCLUSION: Useful data had been obtained for the selection of the placement sites, direction, length, and diameter of orbital implants.