Uses The CT Scanning And Establish Three-dimensional Model To Research The Differences In Using Different Root Canal Preparation Instruments For The Curving Root Canal

Objective :Introduces one kind of appraisal root canal preparation effect the new method,Establishes using the software the large-scale CT scanning image the three dimensional numerical model, and compares 3 kind of root canal preparation instrument different preparation effect with this method the research.And will provide certain instruction for the next clinical work.Methods :Selects new wiping out the adult upper jaw first, two does a lot of talking permanently 15, 45 root canals (MBII, does not count), divides into 3 groups stochastically; Uses CT to scan the experimental model under the 140Kv,140Ma condition, by level thick 0.625mm spacing scanning, data recording.Will scan after the exsomatize to use the different root canal preparation instrument to carry on the preparation separately, will prepare after the exsomatize tooth once more to carry on the scanning by the same condition, will scan the image by the DICOM form output backup, will prepare the before and after data to the exsomatize tooth to carry on the comparative analysis, and will establish the three dimensional numerical model.All root canal preparation operates by the identical person.Result:1. tooth bodies and dental pulp three-dimensional model success establishment.2.3 groups of instruments the plan area, the volume, the surface area interpolation biggest are the Protaper groups, smallest is the manual K-file group; The LSD law 22 comparison groups the difference, the Protapergroup and the K-file group, the Hero642 group have the difference, the K-file group and the Hero642 group do not have the difference.3. Between three groups of instruments, the K-file group root canal displacement quantity is biggest; The LSD law compares 22 comparison groups the difference, the K-file group and the Protaper group, the Hero642 group has the difference, between the Protaper group and the Hero642 group does not have the difference.Conclusion:1. in the cutting ability, the mobile Protaper nickel titanium file surpasses the Hero nickel titanium file and the stainless steel K file.2. this experiment proved, the manual stainless steel instrument occurs the root canal displacement is biggest, but between 2 group of nickel titanium instrument then the not remarkable difference, this kind of displacement main origin in the instrument itself material quality reason, with mobile manual has nothing to do with.3. uses large-scale CT to scan and establishes the three dimensional image model to study around the root canal preparation the shape change method although easy and feasible, but with micro compares in the accuracy also has certain disparity.