Olczak Katarzyna, Pawlicka Halina
Department of Endodontics, Medical University of Lodz, Poland, Pomorska 251, 92-213, Lodz, Poland.
BMC Med Imaging. 2017 Dec 29;17(1):68. doi: 10.1186/s12880-017-0243-3.
The success of endodontic treatment is greatly affected by the location of the root canals. The purpose of this study was to evaluate the root and canal morphology of permanent maxillary first and second molars in a Polish population using cone-beam computed tomography scanning.
Cone-beam computed tomography (CBCT) scans of maxillary first and second molars the maxilla were examined. The number of roots and root canals, and the frequency of additional canals (MB2) in the mesiobuccal root canals were determined. The results were subjected to statistical analysis using the chi-square test or the chi-square test with Yates' correction.
A total of 112 CBCT images of maxillary first (n = 185) and second molars (n = 207) from 112 patients were analyzed. All the maxillary first molars had three roots (100%). The majority of maxillary second molars had three roots (91.8%), 5.8% had two roots and 2.4% had one root. A statistically significant difference was observed between the numbers of roots in the maxillary first and second molars (p < 0.01). A statistically significant difference was also found in the distribution of the number of canals in the maxillary first and second molars (p < 0.001). The majority of maxillary first molars had four root canals (59.5%), while 40.5% had three root canals. Most maxillary second molars had three root canals (70%). Additional canals (MB2) in the mesiobuccal roots were detected significantly more frequently in the maxillary first molars than the second molars (p = 0.000) and more frequently in men than in women (p < 0.05). A higher prevalence of two canals in the mesiobuccal roots in maxillary second molars occurred in patients aged between 31 and 40 years than in patients aged between 21 and 30 years. In the maxillary first molars, the prevalence of the MB2 canal in the mesiobuccal root was almost equally distributed in the two age groups (21-30 and 31-40 years).
Within the limitations of this study, it can be concluded that there are differences in the number and configuration of roots and root canals between maxillary first and second molars in the studied patients of a Polish population.
根管治疗的成功率受根管位置的影响很大。本研究的目的是使用锥形束计算机断层扫描来评估波兰人群中恒牙上颌第一磨牙和第二磨牙的牙根及根管形态。
对上颌第一磨牙和第二磨牙的上颌骨进行锥形束计算机断层扫描（CBCT）检查。确定牙根和根管的数量，以及近中颊侧根管中额外根管（MB2）的出现频率。使用卡方检验或经耶茨校正的卡方检验对结果进行统计分析。
分析了112例患者的112张上颌第一磨牙（n = 185）和第二磨牙（n = 207）的CBCT图像。所有上颌第一磨牙均有三根（100%）。大多数上颌第二磨牙有三根（91.8%），5.8%有两根，2.4%有一根。上颌第一磨牙和第二磨牙的牙根数量存在统计学显著差异（p < 0.01）。上颌第一磨牙和第二磨牙的根管数量分布也存在统计学显著差异（p < 0.001）。大多数上颌第一磨牙有四个根管（59.5%），而40.5%有三个根管。大多数上颌第二磨牙有三个根管（70%）。上颌第一磨牙近中颊侧牙根中额外根管（MB2）的检出频率明显高于第二磨牙（p = 0.000），男性高于女性（p < 0.05）。上颌第二磨牙近中颊侧牙根中两根管的患病率在31至40岁患者中高于21至30岁患者。在上颌第一磨牙中，近中颊侧牙根中MB2根管的患病率在两个年龄组（21 - 30岁和31 - 40岁）中几乎均等分布。
在本研究的局限性内，可以得出结论，在所研究的波兰人群患者中，上颌第一磨牙和第二磨牙在牙根及根管的数量和形态方面存在差异。
