Shujaat S, Abouelkheir H M, Al-Khalifa K S, Al-Jandan B, Marei H F
Department of Oral and Maxillofacial Surgery, College of Dentistry, University of Dammam, P.O. Box 1982, Dammam 31411, Saudi Arabia.
Department of Oral and Maxillofacial Radiology, College of Dentistry, University of Dammam, P.O. Box 1982, Dammam 31411, Saudi Arabia.
Saudi Dent J. 2014 Jul;26(3):103-7. doi: 10.1016/j.sdentj.2014.03.005. Epub 2014 May 5.
To study the correlation between the position of the inferior dental (ID) nerve canal and the angulation of impacted mandibular third molars using dental cone beam computed tomography (CBCT).
The study considered 100 impactions in 85 patients (60 males, 25 females), for whom an initial panoramic radiographic assessment had revealed that the ID canal and the lower 3rd molar were in close proximity. A CBCT scan of each patient was carried out to assess how the ID nerve canal position influenced the class and position of impaction, angulation of impaction, and bone contact.
Class I position B impactions were found in the majority of cases, where the position of the ID canal was approximate to the lingual plate and inferior to the 3rd molar (85.7%). The results were statistically significant (p = 0.001). 96% of the ID canals showed bone contact. Of these, 77.1% of ID canals exhibited lingual bone contact, inferior to impaction. The results were statistically significant (p = 0.001). Horizontally angulated impactions were most common in the mandible, and significantly associated with lingual and inferior positioning of the ID canal (76.2%).
Our sample population most commonly exhibited horizontally angulated class I position B impactions of the mandible. The position of the ID canal significantly influenced the type of impaction and bone contact.
使用牙科锥形束计算机断层扫描（CBCT）研究下颌下（ID）神经管位置与下颌阻生第三磨牙角度之间的相关性。
该研究纳入了85例患者（60例男性，25例女性）的100例阻生情况，初步全景X线评估显示ID管与下颌第三磨牙距离较近。对每位患者进行CBCT扫描，以评估ID神经管位置如何影响阻生的类型和位置、阻生角度以及骨接触情况。
大多数病例为I类B型阻生，其中ID管位置接近舌侧板且在下颌第三磨牙下方（85.7%）。结果具有统计学意义（p = 0.001）。96%的ID管显示有骨接触。其中，77.1%的ID管表现为舌侧骨接触，在下颌阻生下方。结果具有统计学意义（p = 0.001）。水平角度阻生在下颌最为常见，且与ID管的舌侧和下方位置显著相关（76.2%）。
我们的样本人群最常见的是下颌水平角度I类B型阻生。ID管的位置显著影响阻生类型和骨接触情况。
