上頜第二磨牙解剖形態(tài)及臨床研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文上頜第二磨牙解剖形態(tài)及臨床研究姓名：任雯申請學(xué)位級(jí)別：碩士專業(yè)：口腔臨床醫(yī)學(xué)指導(dǎo)教師：朱聲榮201004華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文2MphologyacteristicsClinicalResearchoftheMaxillarySecondMolarsPostgraduate:RenWenTut:Prof.ZhuShengrongAbstractObjective:Tostudythemp

2、hologyacteristicsoftoothrootcanalprovidedsomeknowledgetohelptheclinicalwk.Methods:Sixtyoneteethofseventytwoextractedmaxillarysecondmolarswerecollectednumbered.Thenusingcalipermeasuredsomemphologyacteristics:thelengthofto

3、othcrownrootthewidthofthecrown.Thenumberofrootsthelocationofapicalfamenwererecded.Thesamesamplehadtheircrownscutoffatthelevelofthecementoenameljunctionthepartsoftherootswerechosenastheexperimentalsamplestoobservethemphol

4、ogyacteristicsofthedevelopmentalrootfusionlinesifices.Results:Theaveragesofthelengthofthetoothcrownrootwere19.461.65mm8.190.77mm11.431.78mm.Theaveragesofthewidthofcrownwere9.570.99mm11.580.74mm.Thetoothlengthhadsignifica

5、ntrelationwiththerootlengththecrownlengththesameasthemesiodistalwidthbuccolingualwidth(P0.05).Thepercentagesofthethreeseparaterootsfusedrootswere49.18%47.54%.Themostapicalfamenlocatedonthelateralofrootcanalpoint(62.42%).

6、Theincidencesofthedevelopmentalrootfusionlineswiththetype“Y”“7”were52.46%26.23%.Therewere21.31%oftheothertypes.Themostnumberofificeswerethethreeifices(68.85%)simultaneouslyhaving16.39%ofthefourifices.Conclusions:Theanato

7、myofmaxillarysecondmolarswasmecomplicatedXrayfilmdidn’taccuratelydisplaythemphologyoftoothrootcanal.Soitshouldexaminecarefullyindertopreventomittingrootcanalinclinicalwking.KeyWds:MaxillarysecondmolarAnatomyoftoothMpholo