高溫?zé)崴艹涮罴夹g(shù)對后牙彎曲根管封閉能力的體外實(shí)驗(yàn)研究.pdf

1、山西醫(yī)科大學(xué)碩士學(xué)位論文高溫?zé)崴艹涮罴夹g(shù)對后牙彎曲根管封閉能力的體外實(shí)驗(yàn)研究姓名：王翔宇申請學(xué)位級別：碩士專業(yè)：口腔臨床醫(yī)學(xué)指導(dǎo)教師：任吉芳20040508Avi血DstudyofsealingabilityonHightemlxxamrethermoplasticizedinjectabletechniqueforcurvedcanalsofposteriorteethABSTRACTobjectivesTheaimofthisstu

2、dywastoevaluateandcomparethesealabilityofrootfillingsinextractedhumanteethusingcoldlateralcondensationofgutta—perchaorhightemperaturethermoplasticizedguttaperchainvitroMethodsInvitrostudysixtyfourfreshlyextractedhumanmat

3、urecurvedcanalsofposteriorteethweredividedintofourgroupsonthebasisofrootcanalshapethatwasdeterminedbyangleofcanalcurveAllgroupsconsistedofidenticalnumbersof16AllrootcanalswerepreparedusingNickel—titaniumrotaryinstruments

4、andflushedwithultrasonicirrigationThecanalsofthefirstandsecondgroupswereobturatedusingcoldlateralcondensationandthecanalsoftheothertwogroupswereobturatedusinghightemperaturethermoplasticizedguttaperchaForevaluationoftheq

5、ualityoftheapicalsealing，thecanalsofthefirstandthirdgroupweresubjectedtodyeleakageandthenclearedtoallowthree—dimensionalassessmentofdyepenetrationThesealingabilityoftherootcanalsofthesecondandfourthgroupwereaccessedmorph

6、ometficallyaccordingtothecross—sectionalareaatapicalpart(15ram)andmiddlepart(35mm)，SpeedofObturationWasdeterminedbyrecordingthetimetakentoobturatecanals；theextrusionofsealerandguttaperchathroughtheapicalforamenwasrecorde

7、dusingasimple“yes／no”Atthesametime，surfaceadaptationtothecanalwallwasaccessedbyidenticalmorphometricalmethodResults1Theresultsshowedthatmeandepthsofmicroleakageinrootcanalsinfirstgroupandthirdgroupwasstatisticallysignifi