The aims of the study were to investigate the incidence of C-shaped root canal systems in mandibular second molars in a native Chinese population using radiography and clinical examination under microscope and to comp...The aims of the study were to investigate the incidence of C-shaped root canal systems in mandibular second molars in a native Chinese population using radiography and clinical examination under microscope and to compare the relative efficacies of these methods. For the recognition of C-shaped root canal system, 1 146 mandibular second molars were selected and examined. Teeth with C-shaped canal systems were categorized by using the radiographic classification criteria and the modified Melton＇s method. C-shaped canals were identified in 397 （34.64%） mandibular second molars by radiography （type I, 31.23%; type II, 38.29%; type III, 30.48%）. Clinical examination showed that 449 （39.18%） cases exhibited C-shaped canal systems （C1, 22.94%; C2, 48.11%; C3a, 15.59%; C3b, 13.36%）. As for the result of the radiographic and clinical combined examination, C-shaped root canals were found in 473 （41.27%） mandibular second molars （C1, 21.78%; C2, 45.67%; C3a, 16.70%; C3b, 15.86%）. The incidence of C-shaped root canal diagnosed by radiographic method was statistically different from that by clinical examination and the combined examination （P〈O.05）. The study indicated a high incidence of C-shaped canal system in a Chinese population. The combination of microscopic and radiographic examination is an effective method in identifying the C-shaped root canal system.展开更多
This case report is to present a maxillary first molar with one O-shaped root, which is an extended C-shaped canal system. Patient with chronic apical periodontitis in maxillary left first molar underwent replantation...This case report is to present a maxillary first molar with one O-shaped root, which is an extended C-shaped canal system. Patient with chronic apical periodontitis in maxillary left first molar underwent replantation because of difficulty in negotiating all canals. Periapical radiographs and cone-beam computed tomography （CBCT） were taken. All roots were connected and fused to one root, and all canals seemed to be connected to form an O-shape. The apical 3 mm of the root were resected and retrograde filled with resin-modified glass ionomer. Intentional replantation as an alternative treatment could be considered in a maxillary first molar having an unusual O-shaped root.展开更多
目的:比较Reciproc Blue R25、S3小旋风(BS+B套装)和ORODEKA plex2.0(06锥度)三种机用镍钛器械预备弯曲根管的根管偏移和中心定位能力。方法:选取30颗模拟离体牙的弯曲树脂根管,随机分为三组,每组10颗。分别用Reciproc Blue R25、S3小...目的:比较Reciproc Blue R25、S3小旋风(BS+B套装)和ORODEKA plex2.0(06锥度)三种机用镍钛器械预备弯曲根管的根管偏移和中心定位能力。方法:选取30颗模拟离体牙的弯曲树脂根管,随机分为三组,每组10颗。分别用Reciproc Blue R25、S3小旋风和ORODEKA plex2.0三种不同的机用镍钛器械采用冠向下法预备根管,使用相机拍摄根管预备前后的根管图像,借助制图软件进行预备前后对比收集数据,评价预备后的根管偏移和中心定位能力。结果:Reciproc Blue R25(组1)的预备时间最短,显著小于S3小旋风(组2)和ORODEKA plex2.0(组3)(P<0.05);在根尖区,Reciproc Blue R25(组1)的根尖偏移大于S3小旋风(组2)和ORODEKA plex2.0(组3)(P<0.05);根管弯曲段ORODEKA plex2(组3)根管中心定位能力优于其余两组(P<0.05);弯曲上段,三组间差异无统计学意义(P>0.05)。结论:三种镍钛器械均能维持根管原始形态,Reciproc Blue R25可有效、快速地预备根管;与Reciproc Blue R25相比,S3小旋风和ORODEKA plex2.0具有更好的根管成形能力,更适合弯曲根管的预备。展开更多
基金supported by the grant from the Independent Innovation Foundation of Shandong University of China (No. 2011JC019)the grant of Science and Technique Development Foundation of Shandong province(2010G0020230)
文摘The aims of the study were to investigate the incidence of C-shaped root canal systems in mandibular second molars in a native Chinese population using radiography and clinical examination under microscope and to compare the relative efficacies of these methods. For the recognition of C-shaped root canal system, 1 146 mandibular second molars were selected and examined. Teeth with C-shaped canal systems were categorized by using the radiographic classification criteria and the modified Melton＇s method. C-shaped canals were identified in 397 （34.64%） mandibular second molars by radiography （type I, 31.23%; type II, 38.29%; type III, 30.48%）. Clinical examination showed that 449 （39.18%） cases exhibited C-shaped canal systems （C1, 22.94%; C2, 48.11%; C3a, 15.59%; C3b, 13.36%）. As for the result of the radiographic and clinical combined examination, C-shaped root canals were found in 473 （41.27%） mandibular second molars （C1, 21.78%; C2, 45.67%; C3a, 16.70%; C3b, 15.86%）. The incidence of C-shaped root canal diagnosed by radiographic method was statistically different from that by clinical examination and the combined examination （P〈O.05）. The study indicated a high incidence of C-shaped canal system in a Chinese population. The combination of microscopic and radiographic examination is an effective method in identifying the C-shaped root canal system.
文摘This case report is to present a maxillary first molar with one O-shaped root, which is an extended C-shaped canal system. Patient with chronic apical periodontitis in maxillary left first molar underwent replantation because of difficulty in negotiating all canals. Periapical radiographs and cone-beam computed tomography （CBCT） were taken. All roots were connected and fused to one root, and all canals seemed to be connected to form an O-shape. The apical 3 mm of the root were resected and retrograde filled with resin-modified glass ionomer. Intentional replantation as an alternative treatment could be considered in a maxillary first molar having an unusual O-shaped root.
文摘目的:比较Reciproc Blue R25、S3小旋风(BS+B套装)和ORODEKA plex2.0(06锥度)三种机用镍钛器械预备弯曲根管的根管偏移和中心定位能力。方法:选取30颗模拟离体牙的弯曲树脂根管,随机分为三组,每组10颗。分别用Reciproc Blue R25、S3小旋风和ORODEKA plex2.0三种不同的机用镍钛器械采用冠向下法预备根管,使用相机拍摄根管预备前后的根管图像,借助制图软件进行预备前后对比收集数据,评价预备后的根管偏移和中心定位能力。结果:Reciproc Blue R25(组1)的预备时间最短,显著小于S3小旋风(组2)和ORODEKA plex2.0(组3)(P<0.05);在根尖区,Reciproc Blue R25(组1)的根尖偏移大于S3小旋风(组2)和ORODEKA plex2.0(组3)(P<0.05);根管弯曲段ORODEKA plex2(组3)根管中心定位能力优于其余两组(P<0.05);弯曲上段,三组间差异无统计学意义(P>0.05)。结论:三种镍钛器械均能维持根管原始形态,Reciproc Blue R25可有效、快速地预备根管;与Reciproc Blue R25相比,S3小旋风和ORODEKA plex2.0具有更好的根管成形能力,更适合弯曲根管的预备。
