不同角度金属桩核对无髓牙抗折强度的影响

《不同角度金属桩核对无髓牙抗折强度的影响》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、AbstractobiecfiveInordertoprovidethescientificbasisforthepreventionandtreatmentOndentinecariesanddentinehypersensitivity，theeffectoftheCr-Coalloypostsandcoreswithdifferentanglesonfractureresistancesofpulplessteethwascompared．MethodsEi曲tyrecentlyextractedhumanmaxillarycentralincisorswer

2、erandomlydividedineieatgroupsofteneach．Afterschedulerootcarlaltherapywasperformed，theCrownsoftheseteethwereamputated，thenalltheseteethwererestoredwiththeCr-CoalloypostsandCOPESwithdifferentanglesandthecrownswithCr-Coalloy，About1．5ramferruleWaspreparedforeachoftheteeth．EachspecimenWasem

3、beddedinacrylicresinandsecuredintheCSS一2210materialtestingmachine．Acompressiveloadw船appliedonthelingualsurfaceata45-degreeangletothelongaxisofthecrownuntilfractureoccurred，atacrossbeadspeedof0．5mrn／min．ResultswereanalyzedstatisticallywithSPSSl1．5statisticalsoftware．Results1．Themaximall

4、oadingineachgroupwereremarkablydifferent(P

5、herootoftooth．3．Afterthefractureoccurred，thepossibilitythatCROWSbeingrestoredineachgrouphavenoremarkablediversity．Conclusions1．Thefracturepatternsofpulplessteeth蚓ngrestoredwithmetallicpestsandcoresareharmfulfortherestoreagain．2．Afterthefractureoccurred，thepossibilitythatCroWSbeingresto

6、redwithmetallicpostsandCOreSineachgrouphavenotingwiththeanglebetweenpostsandCOreS．．2一3．WhenthecastpostandCOrewithanglewasusedtOrectifythefaciallymalpositionalmaxillaryanteriorteeth，thecoreshouldnotbeinclinedlinguallyexcessively(thelingualanglebetweenpostandcore一<30。)SOthattherootfractu

7、reCanbeavoided．keywordsPost-coreAngle；Fractureresistance．3一～——一————筵塑抛丛．堂魁竺熊a2富刖舌牙体缺损在临床上是一种极为常见的l二

8、腔疾患，而利用根管修复牙体缺损的桩核技术己有上百年的历史。随着牙髓治疗技术的发展，经过完善根管治疗的残根残冠得以长期保留，副此列贱根残冠的修复治疗就显得尤为重要了。桩冠系统是日前用来修复牙冠损坏已行根管治疗牙齿的有效方法。其目的是：增强牙冠和习：根的抗折性，恢复缺损的牙冠，为最终修复提供基础；可以沿牙体长轴传递咬合力保护无髓牙根；增强美观性等。对残根残冠进行桩冠修复