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
Middle-mesial canals in mandibular molars are present in the population depending on age, sex and ethnicity. However, limited literature alludes to its prevalence. Troughing procedures may enhance identification, clea...Middle-mesial canals in mandibular molars are present in the population depending on age, sex and ethnicity. However, limited literature alludes to its prevalence. Troughing procedures may enhance identification, cleaning and shaping. This case report expresses the recognition and management of middle-mesial canal in a mandibular second molar of 24 years old Hispanic-Latino male.展开更多
BACKGROUND The incidence rate of severely curved root canals in mandibular molars is low,and the root canal treatment of mandibular molars with this aberrant canal anatomy may be technically challenging.CASE SUMMARY A...BACKGROUND The incidence rate of severely curved root canals in mandibular molars is low,and the root canal treatment of mandibular molars with this aberrant canal anatomy may be technically challenging.CASE SUMMARY A 26-year-old Chinese female patient presented with intermittent and occlusal pain in the left mandibular second molar.The patient had undergone filling restoration for caries before endodontic consultation.With the aid of cone beam computed tomography(CBCT),a large periapical radiolucency was observed,and curved root canals in a mandibular second molar were confirmed,depicting a severe and curved distolingual root.Nonsurgical treatments,including novel individualized preparation skills and techniques and the use of bioceramic materials as an apical barrier,were performed,and complete healing of the periapical lesion and a satisfactory effect were achieved.CONCLUSION A case of severely curved root canals in a mandibular second molar was successfully treated and are reported herein.The complex anatomy of the tooth and the postoperative effect were also evaluated via the three-dimensional reconstruction of CBCT images,which accurately identified the aberrant canal morphology.New devices and biomaterial applications combined with novel synthesis techniques can increase the success rate of intractable endodontic treatment.展开更多
目的:应用锥形束计算机断层扫描观察分析维吾尔族成人下颌第二磨牙牙根及根管形态。方法:筛选出符合纳入排除标准的585例患者的影像学资料,共825颗下颌第二磨牙,应用Galileos CBCT机及SIDEXIS Next Generation 2.4图像分析软件,分析维...目的:应用锥形束计算机断层扫描观察分析维吾尔族成人下颌第二磨牙牙根及根管形态。方法:筛选出符合纳入排除标准的585例患者的影像学资料,共825颗下颌第二磨牙,应用Galileos CBCT机及SIDEXIS Next Generation 2.4图像分析软件,分析维吾尔族成人下颌第二磨牙牙根及根管形态及其在性别,年龄间的差异及双侧对称性。结果:在825颗下颌第二磨牙中,男性404颗,女性421颗。双根型检出率最高为73.94%,其次为C形根型24.47%,男性双根型检出率高于女性(P<0.05),女性锥型融合根型检出率高于男性(P<0.05)。C形根型下颌第二磨牙根管形态在根管口处以C1型为主,在根中部和根尖部均以C3型为主,根尖部C4型检出率在性别及不同年龄段间差异具有统计学意义(P<0.01)。双根型下颌第二磨牙的近中根根管形态以Ⅱ型为主占60.77%,其次为Ⅳ型19.17%和Ⅰ型13.22%,远中根以Ⅰ型为主,占92.72%,近中根及远中根根管形态在性别及不同年龄段间差异具有统计学意义(P<0.05)。双侧下颌第二磨牙牙根形态对称率为65%,根管形态对称率为59.71%,双侧下颌第二磨牙牙根及根管形态的对称性在性别及不同年龄段间差异具有统计学意义(P<0.05)。结论:维吾尔族人群下颌第二磨牙牙根及根管形态复杂,具有一定种族差异性,且在性别和不同年龄段也存在一定差异。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Middle-mesial canals in mandibular molars are present in the population depending on age, sex and ethnicity. However, limited literature alludes to its prevalence. Troughing procedures may enhance identification, cleaning and shaping. This case report expresses the recognition and management of middle-mesial canal in a mandibular second molar of 24 years old Hispanic-Latino male.
基金Supported by Natural Science Foundation of Hunan Province,No.S2021JJQNJJ1682Changsha Municipal Natural Science Foundation,No.kq 2014215.
文摘BACKGROUND The incidence rate of severely curved root canals in mandibular molars is low,and the root canal treatment of mandibular molars with this aberrant canal anatomy may be technically challenging.CASE SUMMARY A 26-year-old Chinese female patient presented with intermittent and occlusal pain in the left mandibular second molar.The patient had undergone filling restoration for caries before endodontic consultation.With the aid of cone beam computed tomography(CBCT),a large periapical radiolucency was observed,and curved root canals in a mandibular second molar were confirmed,depicting a severe and curved distolingual root.Nonsurgical treatments,including novel individualized preparation skills and techniques and the use of bioceramic materials as an apical barrier,were performed,and complete healing of the periapical lesion and a satisfactory effect were achieved.CONCLUSION A case of severely curved root canals in a mandibular second molar was successfully treated and are reported herein.The complex anatomy of the tooth and the postoperative effect were also evaluated via the three-dimensional reconstruction of CBCT images,which accurately identified the aberrant canal morphology.New devices and biomaterial applications combined with novel synthesis techniques can increase the success rate of intractable endodontic treatment.
文摘目的:应用锥形束计算机断层扫描观察分析维吾尔族成人下颌第二磨牙牙根及根管形态。方法:筛选出符合纳入排除标准的585例患者的影像学资料,共825颗下颌第二磨牙,应用Galileos CBCT机及SIDEXIS Next Generation 2.4图像分析软件,分析维吾尔族成人下颌第二磨牙牙根及根管形态及其在性别,年龄间的差异及双侧对称性。结果:在825颗下颌第二磨牙中,男性404颗,女性421颗。双根型检出率最高为73.94%,其次为C形根型24.47%,男性双根型检出率高于女性(P<0.05),女性锥型融合根型检出率高于男性(P<0.05)。C形根型下颌第二磨牙根管形态在根管口处以C1型为主,在根中部和根尖部均以C3型为主,根尖部C4型检出率在性别及不同年龄段间差异具有统计学意义(P<0.01)。双根型下颌第二磨牙的近中根根管形态以Ⅱ型为主占60.77%,其次为Ⅳ型19.17%和Ⅰ型13.22%,远中根以Ⅰ型为主,占92.72%,近中根及远中根根管形态在性别及不同年龄段间差异具有统计学意义(P<0.05)。双侧下颌第二磨牙牙根形态对称率为65%,根管形态对称率为59.71%,双侧下颌第二磨牙牙根及根管形态的对称性在性别及不同年龄段间差异具有统计学意义(P<0.05)。结论:维吾尔族人群下颌第二磨牙牙根及根管形态复杂,具有一定种族差异性,且在性别和不同年龄段也存在一定差异。
