1、口腔疾病防治2023年12月第31卷第12期Journal of Prevention and Treatment for Stomatological Diseases,Dec.2023,Vol.31 No.12http:/【摘要】目的应用锥形束计算机体层摄影术(conebeam computed tomography,CBCT),研究分析西藏地区藏族人群的下颌第一恒磨牙的牙根及根管形态,为藏族人群临床根管治疗提供参考。方法本研究已通过单位伦理委员会审查批准,并获得患者知情同意。纳入300例藏族患者的300颗下颌第一恒磨牙的CBCT影像学资料,记录患者年龄及其下颌第一恒磨牙牙根数目,并用Ve
2、rtucci分类法统计分析近中牙根及远中牙根根管形态及发生率。结果300颗下颌第一恒磨牙中双根牙198颗;三根牙102颗,三根牙中有1颗存在近中舌根,其余为远中舌根,远中舌根发生率为33.7%(101/300)。近中根最常见根管构型为Vertucci 型65.7%(197/300),其次为 Vertucci 型 20.3%(61/300)。近中中央根管(middle mesial canal,MMC)发生率为 6%(18/300),其中2040岁年龄段发生率最高,为9%(9/100)。远中单根的下颌第一恒磨牙远中根以Vertucci型根管为主,占比66.8%(133/199),其次为Vertu
3、cci 型14.6%(29/199)和Vertucci 型11.6%(23/199);远中为双根的下颌第一恒磨牙,96%(97/101)的远颊根根管和 100%(101/101)远舌根根管为 Vertucci 型。结论藏族人群的下颌第一恒磨牙形态复杂多变,约1/3的患者具有远中舌根,临床医生应在CBCT的指导下仔细探查根管。【关键词】藏族人群;下颌第一恒磨牙;锥形束计算机体层摄影术;近中中央根管;远中舌根【中图分类号】R78【文献标志码】A【文章编号】20961456(2023)12087706【引用著录格式】次仁卡卓,陈立,白玛德吉,等.藏族人群下颌第一恒磨牙牙根及根管形态的CBCT研究J.
4、口腔疾病防治,2023,31(12):877882.doi:10.12016/j.issn.20961456.2023.12.006.Cone beam computed tomography study on the root and root canal morphology of mandibular first permanent molars in a Tibetan populationCI Ren Ka Zhuo1,CHEN Li1,2,BAI Ma De Ji1,AN Shengqin1,ZHUO Ma BaYang1,DAN Zeng Que Dan1.1.Departmen
5、t of Stomatology,Peoples Hospital of Tibetan Autonomous Region,Lhasa850000,China;2.Department of Prosthodontics,Peking University School and Hospital of Stomatology,Beijing100081,ChinaCorresponding author:CHEN Li,Email:ccchen_,Tel:861082195532【Abstract】ObjectiveTo investigate and analyze the root an
6、d root canal morphology of mandibular first molars(MFMs)in the Tibetan population using conebeam computed tomography(CBCT)and to provide references for clinicalroot canal treatment in the Tibetan population.MethodsThis study was reviewed and approved by the Ethics Committee,and informed consent was
7、obtained from the patients.CBCT imaging data of 300 mandibular first molars from 300Tibetan patients were included.Patient age,the number of roots in mandibular first molars were recorded.The morphology and incidence of mesial root and mesial root canals and the morphology and incidence of distal ro
8、ot and distal rootcanals were statistically analyzed by Vertucci classification.ResultsThere were 198 doubleroot teeth and 102 threeroot teeth in the 300 mandibular first permanent molars.Among the threerooted molars,1 case had mesiolingual roots,and the rest had distolingual roots.The incidence rat
9、e of the distolingual root was 33.7%(101/300).The most common微信公众号【收稿日期】20230423;【修回日期】20230701【基金项目】西藏自治区自然科学基金组团式援藏医学项目(XZ2021ZRZY07(Z))【作者简介】次仁卡卓,医师,硕士,Email:【通信作者】陈立,教授,博士,Email:ccchen_,Tel:861082195532DOI 10.12016/j.issn.20961456.2023.12.006临床研究藏族人群下颌第一恒磨牙牙根及根管形态的CBCT研究次仁卡卓1,陈立1,2,白玛德吉1,安生琴1,卓玛
10、巴央1,旦增确旦11.西藏自治区人民医院口腔科,西藏自治区 拉萨(850000);2.北京大学口腔医学院 口腔医院修复科,北京(100081)877口腔疾病防治2023年12月第31卷第12期Journal of Prevention and Treatment for Stomatological Diseases,Dec.2023,Vol.31 No.12http:/root canal configuration was Vertucci 65.7%(197/300),followed by Vertucci 20.3%(61/300)in the mesial roots.The ov
11、erall incidence of middle mesial canals(MMCs)was 6%(18/300),with the highest incidence of MMCs in the 2040 yearold group at 9%(9/100).The distal roots canals of singledistalrooted mandibular first molars were mainly Vertucci 66.8%(133/199),followed by Vertucci 14.6%(29/199)and Vertucci 11.6%(23/199)
12、.For the mandibular first permanent molars with two distal roots,96%(97/101)of the distal buccal roots and 100%(101/101)of the distal lingual roots were Vertucci root canals.ConclusionThe root and root canal morphology of mandibular first permanent molars in a Tibetan population is complex and varia
13、ble.Approximately onethird of patients have distolingualroots,and clinicians should carefully explore the root canals under the guidance of CBCT.【Key words】Tibetan population;mandibular first permanent molar;cone beam computed tomography;middlemesial canals;distolingual rootsJ Prev Treat Stomatol Di
14、s,2023,31(12):877882.【Competing interests】The authors declare no competing interests.This study was supported by the grants from Natural Science Foundation of Tibet Autonomous Region(No.XZ2021ZRZY07(Z).下颌第一恒磨牙是口腔中萌出的第一颗恒牙,对于行使咀嚼功能及维持关系稳定具有重要作用,被称为“关键”。但因该牙萌出较早、解剖形态复杂(咬合面有较多的窝沟)、自洁作用差等特点,是牙髓病的好发牙位1。锥
15、形束CT(conebeam computed tomography,CBCT)可从矢状面、冠状面以及横断面对根管进行精确的形态学分析,是研究根管系统解剖较为准确的方法,对临床具有重要指导作用23。目前国内外很多学者对不同民族、不同地区的下颌第一恒磨牙的牙根和根管系统形态做了大量研究,但关于藏族人群下颌第一恒磨牙牙根和根管系统形态的研究鲜有报道。本研究通过 CBCT 分析西藏地区藏族人群下颌第一恒磨牙牙根和根管系统形态,以期为提高藏族人群下颌第一恒磨牙根管治疗的成功率提供参考。1资料和方法本研究已通过西藏自治区人民医院伦理委员会审查批准(批号:METBHP23KJ013)。1.1样本采集本研究纳
16、入2018年1月至2021年1月期间就诊于西藏自治区人民医院口腔科,因复杂牙体牙髓病变、牙种植术、牙槽外科手术等治疗需要进行CBCT辅助检查的藏族患者。纳入标准:CBCT图像高质量无伪影;至少具有一颗下颌第一恒磨牙;下颌第一恒磨牙根尖发育完全;下颌第一恒磨牙无龋源性或非龋源性病变;下颌第一恒磨牙无牙髓治疗或修复治疗史;无牙根吸收、纵折、根管钙化或根尖周病变;连续三代为藏族祖籍;年龄1060岁。排除标准:临床资料缺乏者。本研究总共筛选出符合标准的300例患者,男性 156 例,女性 144 例。300 例患者只选取了其中一侧磨牙;两侧磨牙均满足纳入标准则根据患者ID尾号,双数记录右侧,单数记录左侧。其中10 20 岁组(含 20 岁)100 例,20 40 岁组(含 40 岁)100 例,40 60岁组(含60岁)100例。1.2图像采集采用 VaTeCH PaXUni3D(怡友,韩国)进行全牙弓扫描。扫描条件为:电压 89 kV,电流 5 mA,曝光时间 15 s,体素 120 L,视野 80 mm80 mm。1.3图像分析方法所有CBCT 图像均采用仪器自带的 EasyDent4Vi