Clinical Application Of S3 In Preparation Of Curved Root Canals In The Posterior Teeth

Objective: This article will be in the form of comparative analysis of S3 root canal files and traditional Pro-Taper files,revealing the characteristics of both file systems in root canal preparation,their effect on root canal filling,and the operative time period of each system.This clinical observation aims to provide significance in the practicality and clinical application of S3 nickel titanium.Methods: 40 patients were selected in the study,and they were randomly divided into S3 group and Pro-Taper group.Routine parallel radiographs were taken to observe the root canals numbers and patterns.40 teeth that met the standard of the study were selected,pulp cavity preparations were performed,and elimination of triangular collar,10# files or 15#K files were used for probing the canal,followed by cleaning and shaping of the tooth's root canal with irrigation between different file sizes.Experimental group: We used 16:1 speed rotary hand-piece with S3 files to make the canal preparation,using the crown down technique(motor speed 500 rpm,torque2.5Ncm),we used an endometer combined with X-radiographs to determine the working length.We used SU(10/20 file)to open the root canal on the section,create a line since the pulp chamber to root canals,and then according to the need and treatment of teeth,followed by 1S(04/20),2S(06/25),3S(04/35)prepare the root canals,inserting the S3 file into the root canal then start the motor,with slight pressure "peck" the root canal file along the way,to push toward the apex and to reach the working length,applying 3-4 pulling action,and then change to the next file size.In the preparation process,each file must not exceed 3 ~ 5S in the root canal.We applied EDTA in order to lubricate the root canal walls to introduce a 15#K files to prepare the canal,whenever we change file sizes we irrigate the canal with 0.5% sodium hypochlorite and 0.9% normal saline,after finishing the root canal preparation,we fill and seal the canal with Zn O cement.Control group: 16:1 speed rotary hand-piece with Pro-Taper,using the crown down technique(motor speed 250 rpm,torque 2.0Ncm),we used an endometer combined with X-radiographs to determine the working length,we applied EDTA with the operative process to lubricate the root canal walls,SX wereused to fully open crown 2/3,create a line since the pulp chamber to root canals,and then sequentially S1?S2 were prepared and arrived on the working length,according to the circumstances and needs of surgical treatment of teeth,F1,F2,F3 to prepare working length,whenever exchange equipment when all we want to use a lot of 0.5% sodium hypochlorite and 0.9% normal saline in the final wash root canals,after finishing the root canal preparation,trial point,we fill and seal the canal with Zn O cement.Post-operative X-radiographs were taken to observe the result of root preparation and root filling.Both groups were operated by the same doctor,and the preparation time was recordeed(root preparation time = the time between the first nickel titanium file on the first root canal,to the last file on the last root canal,minus the irrigation time,the time it took to make X-radiographs,and the time for measuring the working length of the root canals).Result:(1)There was one case from the S3 group who's apical 1/3 changed in direction.In the Pro-Taper group,there were 5 cases where the apical 1/3 have change in direction and 3 cases where the root's middle 1/3 have changed in direction.The T-sample tests of root preparation in group revealed that the S3 group(98.53%)was significantly better than that in group Pro-Taper(88.06%),with P < 0.05 significance level.(2)Master gutta percha under charge of 1 cases in group S3 with the appropriate root canal lumen,not the overcharge phenomenon;Pro-Taper group did not appear under filling,2 cases showed the sealer passing beyond the apical foramen,but not exceeding the gutta percha filling,the success rate of two groups were 95% and 90%,with P >0.05 significance level.(3)S3 group and Pro-Taper group,the average time for the preparation of each tooth was(102.69±4.53)s?(175.45±3.94)s respectively,the difference was statistically significant with P < 0.01 significance level.Conclusion: S3 files are more superior to Pro-Taper files in the central positioning,which is time-saving and more with less working efforts,but there is no significant difference between the two groups.