Iikubo Masahiro, Osano Takashi, Sano Tsukasa, Katsumata Akitoshi, Ariji Eiichiro, Kobayashi Kaoru, Sasano Takashi, Wakoh Mamoru, Seki Kenji, Kojima Ikuho, Sakamoto Maya
Associate Professor, Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Assistant Professor, Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine, Yokohama, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2015 Oct;120(4):521-7. doi: 10.1016/j.oooo.2015.06.030. Epub 2015 Jul 9.
To clarify the cause of artificial tooth-root fracture lines in cone beam computed tomography (CBCT) images caused by root canal filling materials and to enhance the diagnostic performance of CBCT.
We analyzed the CBCT images of 18 extracted human teeth (9 upper central incisors and 9 lower premolars) that were filled with a size 50 gutta-percha cone and inserted into tooth sockets in a human skull.
The CBCT images of the incisors displayed artificial lines in the oblique directions, notably the mesiobuccal, distolingual, distobuccal and mesiolingual directions, but only rarely in the cross-directions (buccal, lingual, mesial, and distal). In the premolars, the reverse was true, with lines mainly in the cross-directions, mesial and distal directions particularly. The lines were predominantly at the cervical slice.
Artifacts resulting from root filling material appear along the long axis of the alveolar bones, and resemble root fractures.
阐明根管充填材料在锥形束计算机断层扫描（CBCT）图像中导致人工牙根骨折线的原因，并提高CBCT的诊断性能。
我们分析了18颗拔除的人类牙齿（9颗上颌中切牙和9颗下颌前磨牙）的CBCT图像，这些牙齿用50号牙胶尖充填，并插入人类颅骨的牙槽窝中。
中切牙的CBCT图像在斜向方向上显示出人工线条，特别是近中颊侧、远中舌侧、远中颊侧和近中舌侧方向，但在横向方向（颊侧、舌侧、近中侧和远中侧）很少出现。在前磨牙中，情况相反，线条主要出现在横向方向，尤其是近中侧和远中侧方向。这些线条主要出现在颈部层面。
根管充填材料产生的伪影沿牙槽骨的长轴出现，类似牙根骨折。
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