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Purpose: Compare the application value of cone bean CT and spiral CT in jaw defect threedimensional reconstruction.Methods: Respectively,using CBCT and spiral CT to scan 10 hemi-maxillary defect patients and 3 Mandible defect patients craniofacial and conduct three-dimensional reconstruction with accompanying software.Results: CBCT emerges a much more accurate,legible and emulational image compared to spiral CT.Conclusion: CBCT may get a broader clinical application for its efficiency and accuracy in reconstructing jaw defects compared to spiral CT.CBCT may get a broader clinical application for its efficiency and accuracy in reconstructing jaw defects compared to spiral CT.