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The preoperative and postoperative sagittal and axial angles of CBT screws or TPT screws were also measured and compared. Four screws were placed in each vertebral body of six lumbar specimens for a total of 120 screws. Screw grades 99 screws as grade 0, 15 as grade 1, six as grade 2, and zero as grade 3. Thus, grade 0 accounted for 82.5% of the screws. No significant differences in the preoperative and postoperative angles of the screws were found (P 0.05). 3D-printed surgical guide templates for double-trajectory screw placement
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