Alfouzan Khalid, Alfadley Abdulmohsen, Alkadi Lubna, Alhezam Abdullah, Jamleh Ahmed
Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Saudi Arabia.
King Abdullah International Medical Research Centre, National Guard Health Affairs, Riyadh, Saudi Arabia.
Scanning. 2019 Mar 13;2019:9568307. doi: 10.1155/2019/9568307. eCollection 2019.
The aim of this study was to determine MB2 canal detectability in maxillary first and second molars obtained from a Saudi population using micro-CT. Maxillary first ( = 35) and second ( = 30) molars were scanned with micro-CT technology. The number of canals was recorded, and in case of having more than one canal, the level of extracanal detection was analyzed. The presence of extracanal was categorized based on the level they were first detected. Among the maxillary first molars, 28 (80%) and six (17%) teeth had two and three MB canals, respectively. Among the maxillary second molars, 24 (80%) and four (13%) teeth had two and three MB canals, respectively. The MB2 canal was detected at the chamber floor in 70% and 61% of the maxillary first and second molars, respectively. At 1 mm depth, the MB2 canal was found in 15% and 18% of the maxillary first and second molars, respectively. At 2 mm depth, the MB2 canal was found in 3% and 18% of the maxillary first and second molars, respectively. The remaining teeth had the MB2 canal at levels deeper than 2 mm. The MB2 canal was detected in 97% and 93%% of maxillary first and second molars, respectively. Among them, the MB2 canal could be immediately detected in 70% and 61% of the maxillary first and second molars, respectively, once the pulp chamber is exposed. However, the rest of the MB2 were observed at deeper levels in the root and this requires troughing preparation in the chamber floor.
本研究的目的是使用显微CT确定从沙特人群获取的上颌第一和第二磨牙中MB2根管的可探测性。对上颌第一磨牙（n = 35）和第二磨牙（n = 30）采用显微CT技术进行扫描。记录根管数量，若存在多个根管，则分析根管外探测水平。根据首次探测到根管外的水平对其存在情况进行分类。在上颌第一磨牙中，分别有28颗（80%）和6颗（17%）牙齿有两条和三条MB根管。在上颌第二磨牙中，分别有24颗（80%）和4颗（13%）牙齿有两条和三条MB根管。在上颌第一和第二磨牙中，分别有70%和61%的牙齿在髓室底探测到MB2根管。在深度1mm处，上颌第一和第二磨牙中分别有15%和18%的牙齿发现有MB2根管。在深度2mm处，上颌第一和第二磨牙中分别有3%和18%的牙齿发现有MB2根管。其余牙齿的MB2根管位于深度超过2mm处。上颌第一和第二磨牙中分别有97%和93%探测到MB2根管。其中，上颌第一和第二磨牙分别有70%和61%在暴露髓室后可立即探测到MB2根管。然而，其余的MB2根管在牙根更深的位置被观察到，这需要在髓室底进行槽形预备。
