人下颌恒切牙管间峡区解剖的显微CT研究

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1、［文章编号］1()0()-1182(201®02-0177-04人下颌恒切牙管间峡区解剖的显微CT研究刘成霞I李文2郑庆华I耿宁I孙拓祺I黄定明$(1•口腔疾病研究国家重点实验室，四川大学；2.四川大学华西口腔医院牙体牙髓病科，四川成都610041)［摘要］目的研究人离体下颌恒切牙管间峡区的解剖学特点。方法选择离体下颌恒切牙拍摄近远中向X线片,选出双根管牙33颗，对距根尖6mn】以内的牙根组织进行显微CT扫描。扫描层片2(川叫每颗牙齿获得扫描截面30()个。通过三维重建观察牙根管间峡区的解剖形态。记录距根尖1、2、3、4、5、6mm处各截面根管数目及管间峡区的出现情况，并测量根管壁的

2、最小厚度。结果所有双根管下颌恒切牙都存在管间峽区，完全峡区占49.7%,部分峡区占4.5%。距根尖6mm内各截面管间峡区的岀现率为10・0%~85.5%,卡方检验显示距根尖I〜6mrn处管间峡区岀现率的差异有统计学意义(/—().()()1)。距根尖3~6nw处管间峡区出现率较高，以5mn.it最高，为85.5%。距根尖6mm以内的根管壁最小厚度均小于().5rnnio结论下颌恒切牙管间峡区的出现率较高，根管壁最小厚度位于峡部,在临床进行根管治疗和牙髓外科手术时应引起重视。［关键词］根管解剖；下颌切牙；管间峡区；根管壁厚度［中图分类号］R781［文献标志码］A［doi］10.3969

3、/j.issn.1000-1182.2010.02.016AnatomicstudyofcanalisthmusesofmandibularpermanentincisorsbyMicro-CTLIUCheng-xiaLIWen2,ZHENGQing-hua'、GENGSUNTuo-qiHUANGDing-ining2.(1.StaleKeyLaboratoryofOralDis-eases,SichuanUniversity,Chengdu610041,China;2.Dept,ofConservativeDentistryandEndodontics^WestChinaCol

4、legeofStomalolog)SichuanUniversity,Chengdu610041,Chinci)[Abstract]ObjectiveToinvestigatetheanatomicfeatureofthecanalisthmusofmandibularpermanentincisorsbyMicro-CT.MethodsThirtv-thrccmandibularpcrinanentincisorswithtwocanalswereselectedthroughtheradiographinproximalview・Theseteethwerethenscann

5、edusingMicro-CTandreconstructed.Thescanninglayerthicknesswas20pum.Weobsen'edtheapical6mmofthe33roots,and300sectionsweregainedeachtooth・givingatotalof9900sections・Thenumbersofcanalsateachlevelinlheapical6mmwererecorded.Thenum-l>ersofsectionsshowingisthmusesateachleveloftherootcanalswererecordedS

6、o.DntawereanalyzedusingtheChi-squarestatistictotestthenullhypothesisthatlocationofthesectionsineachoftheapical6mmandpresenceoftheisthmuswereindependent.Theininiinumrootcanalwallthicknesswasmeasuredineachoftheapical6mmofllieroots・ResultsIsthmuseswerefoundtobe[)resentalalllevelswilhprevalencefrom

7、10.0%to85.5%・TheChi-squaretestindicatedasignificantdifferenceinthedistributionofisthmuseswithsection(P=0.001).Theincidenceofisthmuseswashigherattheapical3-6mmlevel,andthehighestincidence(85.5%)wasat5mmlevel.Thereweremanymoresecti