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The Root Canal Forming Ability Study of TF Nickel-titanium File Using Cone Beam CT

Author: WangAnYang
Tutor: NiuWeiDong
School: Dalian Medical University
Course: Clinical Stomatology
Keywords: Root canal deviation cone beam CT TF instrument K3instrument ProTaper instrument
CLC: R781.05
Type: Master's thesis
Year: 2013
Downloads: 8
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Abstract


Objective:Comparing the root canal forming ability of TF、 K3andProTaper files using cone beam CT.Methods:The resin simulated root canals was used as the experimentalmodel.Totally27samples were recruited. Before the root canal preparation,the model was scanned by cone beam CT,aftering injecting the dye.all thecanals were prepared by crown-down RCT technique. The scanning was thesame with the precious. record after root canal Preparing time、 Root canalstraightening degree of each group、 Cutting volume comparison、 Area ofresin removal and canal center transportation were calculated bymimics8.1、PhotoshopCS5、 ImageJ software.Results:1.Preparation time:The average preparation time of TF、K3、ProTaperwas33.56±1.14s、73.59±1.47s、60.65±2.32s,separately the difference amongthese groups have ststistical significane(P<0.05).2.Root canal straightening degree:TF、 K3and ProTaper,s average rootcanal curvature changes are:1.74±0.65°、5.96±1.13°、2.44±1.14°,K3groupshows significantly high degree(P<0.05).3.Cutting volume comparison:TF、 K3、 ProTaper,s average cuttingvolume are:2.26±0.76mm3、2.82±1.01mm3、6.2±2.29mm3.Similarly,K3filecut more material than the other two groups(P<0.05).4.Area of resin removal:The average cross sectional area change at2mm to the apical orifice was0.27±0.04mm~2、0.37±0.04mm~2、0.47±0.06mm~2for TF、K3and ProTaper. At3mm there are0.29±0.03mm~2、0.37±0.05mm~2、 0.53±0.07mm~2. these three groups shows significantly differences at thesetwo places. For1、4、5、6、7、8mm,there was only difference betweenProTaper and TF or K3(P<0.05).5.canal center transportation:The1、2、3mm at the root orifice of TF、K3and ProTaper is respectively:1mm0.027±0.004cm、0.09±0.004cm、0.067±0.002cm,2mm0.031±0.003cm、0.077±0.005cm、0.063±0.005cm,3mm0.031±0.003cm、0.074±0.005cm、0.051±0.003cm,TF、K3、ProTaperhave statistical difference among these groups(P<0.05);4、5mm from theapex of TF、 K3、 ProTaper is respectively:4mm0.03±0.001cm、0.034±0.001cm、0.033±0.001cm,5mm0.03±0.003cm、0.036±0.004cm、0.035±0.004cm.Conclusions:The preparation of severe bending resin simulated rootcanals by TF files takes short time、 maintains the original direction、 hadsmall deviation degree,Furthermore,the cutting quantity of material issmall.

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