目的：评价直接数字化影像技术在下颌第一磨牙牙根纵裂诊断中的作用。
Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.
目的研究直接数字化影像技术诊断根尖周微小病损的能力以及图像处理技术对诊断结果的影响。
Objective the purpose of this study was to investigate the performance of direct digital radiography, with and without image processing, for the detection of periapical lesions.
结论直接数字化影像技术具有良好的诊断根尖周微小病损的能力，图像处理技术能够显著提高数字化牙片的诊断能力。
Conclusion Direct digital radiography is a promising technique in the detection of periapical lesions. Image processing could improve the diagnostic performance of digital images.
结论直接数字化影像技术具有良好的诊断根尖周微小病损的能力，图像处理技术能够显著提高数字化牙片的诊断能力。
Conclusion Direct digital radiography is a promising technique in the detection of periapical lesions. Image processing could improve the diagnostic performance of digital images.
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