Title of article :
Evaluation of Crack Formation and Propagation withUltrasonic Root-End Preparation and Obturation Using a DigitalMicroscope and Optical Coherence Tomography
Author/Authors :
Okiji, Takashi Department of Pulp Biology and Endodontics - Graduate School of Medical and Dental Sciences - Tokyo Medical and DentalUniversity (TMDU) - Tokyo, Japan , Rashed, Bayan Department of Pulp Biology and Endodontics - Graduate School of Medical and Dental Sciences - Tokyo Medical and DentalUniversity (TMDU) - Tokyo, Japan , Iino, Yoshiko Department of Pulp Biology and Endodontics - Graduate School of Medical and Dental Sciences - Tokyo Medical and DentalUniversity (TMDU) - Tokyo, Japan , Ebihara, Arata Department of Pulp Biology and Endodontics - Graduate School of Medical and Dental Sciences - Tokyo Medical and DentalUniversity (TMDU) - Tokyo, Japan
Abstract :
Thisstudyisaimedatdetermining(1) theeffectofroot-endresection,ultrasonicroot-endpreparation, androot-endfillingontheincidenceofcrackformationandpropagationbyusingadigitalmicroscope (DM) andopticalcoherencetomography(OCT) and (2) theperformanceofOCTonthedetectionofcracksbycomparingwithmicrocomputedtomography(micro-CT) asareferencestandard.Methodology.Thirtyextractedlowerincisorswereendodonticallytreatedandsubjectedtoroot-endresectionandultrasonicroot-endcavitypreparation. Then,theteethweredividedintothreegroups(n=10,each), andtheroot-endcavitywaseitherleftunfilledorfilledwithmineraltrioxideaggregate (MTA)orsuper-EBA. TheresectedsurfacewasobservedwithOCTandDMaftertheroot-endresection,ultrasonicroot-endpreparation,androot-endfilling,andthefrequencyofincompleteandcompletecrackswererecorded.Theobservationwasrepeatedafter twoweeks,onemonth,andtwomonths,andmicro-CT scansaftertwomonthsweretakenasthegoldstandard.Results. TheDMresultsshowdentinalcrackformationin47% of thesamplesfollowingroot-endresectionandin87%followingultrasonicpreparation. Aftertheultrasonicpreparation,noexistingcrackpropagatedtoacompletecrack, butnewcrackswereformed. MTAandsuper-EBAhadnoeffectoncrackformation.TheSpearmancorrelationcoefficientbetweenOCTandDMwas0.186(veryweakcorrelation;p=0:015). Sensitivityandspecificityincomparisontomicro-CTwere0.50and0.55inOCTand1.00and0.35inDM,respectively.McNemar’stestshowedasignificantdifferencebetweenOCTandDM(p<0:05). Conclusion.Apicalresectionandultrasonicpreparationcouldformdentinalcracks.OCTandDMshoweddifferentdetectionfrequenciesofcrackswithveryweakcorrelation.DMshowedsuperiorsensitivitycomparedwithOCT.
Keywords :
Evaluation , Crack Formation , Propagation , Ultrasonic Root-End Preparation , Obturation Using , Digital Microscope , Optical Coherence Tomography
