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1、·304·临床口腔医学杂志2005年5月第21卷第5期 JClinStomatol,May,2005,Vol.21,No.5根尖止点阻止根充材料超充的效果研究张元旌,葛成功,刘旺国(武汉普爱医院口腔科 湖北武汉 430030)[摘要] 目的:研究根管治疗中制备根尖止点对阻止根管充填材料超充的影响。方法:选取80个单根管上、下颌尖牙,其中40个牙采用逐步后退技术,常规制备根尖止点进行根管预备至根尖孔上1mm,另40个牙亦采用逐步后退技术预备至根尖孔,不进行根尖止点的制备;再将以上各组牙随机平分为两组,分别采用冷牙胶侧方加压和热牙胶垂直加压方法充填根管,观察并记录每组中牙胶超出根尖的牙数,收集
2、每个牙超出的充填材料(牙胶和糊剂)并称量,对实验结果进行统计学分析。结果:制备根尖止点的侧方加压组与不制备根尖止点的侧方加压组之间根充材料超出的量、制备根尖止点的垂直加压组与不制备根尖止点的垂直加压组之间根充材料超出的量均无统计学差异(P>0.05)。结论:通过在初尖锉#的基础上扩大3的方法制备根尖止点并不一定能起到减少根充材料超充的作用。[关键词]根管充填;根尖止点;牙胶超充[中图分类号]R781.05[文献标识码]A[文章编号]1003-1634(2005)05-0304-03Invitrotheeffectofapicalstoponthefillingmaterialextrusi
3、onduringrootcanaltreatmentZHANGYuan2jing,GECheng2gong,LIUWang2guo.DepartmentofStomatology,WuhanPuAiHospital.Wuhan430030,China[Abstract]Objective:Toinvestigatetheeffectofapicalstopwhichhadbeencreatedbyenlargingtherootcanaltothreesizesgreaterthanthatofthefirstfilebindingattheworkinglengthonthemateri
4、alextrusion.Method:Eightymaxillaryandmandibularcaineswithsinglestraightcanalswerechoosen.Forthwereinstrumentedto1mmshortoftheapicalforamenthroughstep2backtech2niquewithapicalstopcreated.Theotherfortyteethwerepreparedtotheapicalforamenthroughtheserialshapingtechniquewithnoapicalstop.Allthecanalswit
5、handallthecanalswithoutapicalstopwererandomlydividedintotwogroupswithtwentycanalseachandwereobturatedwithcoldlateralandverticalwarmcondensationtechnique,respectively.Thenumberofteethwithgutta2perchaextrusionandtheweightsofextrudedmaterialincludinggutta2perchaandsealerwereallrecorded.Then,theresult
6、swereanalyzedstatistically.Result:Duringtheextrusiontests,nosignificantdifferencewasfoundbetweencanalspreparedwithandcanalspreparedwithouttheapicalmatrixcreationprocedureintwolateralcondensationorverticalcondensationgroups.Conclusion:Theproceduretoenlargerootcanalsto3sizesgreaterthanthatofthefirst
7、bindingfilewillnotalwaysreducetheamountoffillingmaterialsextruded.[Keywords]canalobturation;apicalstop;gutta2perchaextrusion# 根管治疗中在根尖部形成根尖止点(apicalstop,看见,记录根管的实际长度,根管预备过程中采用15K锉保持根AS),目的是通过这种方法形成一个根尖屏障,使牙胶既尖的通
