The Clinical Efficacy Of M3-L Nickel Titanium System In Root Canal Preparation

Objective:Contrast M3-PRO,M3-L machine with three kinds of nickel and titanium ProTaper preparation system for clinical of root canal preparation,in patients with pain after root canal preparation degree and the incidence of pain in comparison,evaluate the clinical curative effect of M3-L.Methods:From the patients of the First Affiliated Hospital of Dalian Medical University of department of stomatology,61 patients who met the requirements were randomly selected and diagnosed with pulpitis,and they were divided into groups A,B and C on average.X-ray films were taken before surgery in all three groups to estimate the degree of lesion,size of medulla cavity,position of medulla horn and medulla bottom,number,length and degree of curvature of root canal.Under local anesthesia,the pulp is opened and extracted from the putrid material to form a straight path into the root canal.The 10 th hand dregs the root canal with a stainless steel K file,and the 15 th hand prepares the root with a stainless steel K file.Group A adopts the M3-L manufacturer's recommended open-cut file with A tip of 0.17 mm with A taper of 8% and A tip of 0.19 mm with A taper of 2% to file the smooth root canal.If the no.20 K file can reach the working length under the condition of additional force,then L2 red in M3-L is selected for root canal preparation.If the no.20 K file can easily reach the root tip,prepare the canal with L3 green in M3-L.100/5000 In group B,the open file in M3-PRO was used to preopen the canal,and the channel file was used to smooth the root canal.Then,the yellow shaped file with a taper of0.20 mm,a taper of 4% on the tip,a red shaped file with a taper of 4% on the tip,and a double red shaped file with a taper of 6% on the tip were used to complete the root canal preparation.In group C,S1,Sx,S1,S2,F1 and F2 in machine ProTaper were used in turn to complete the whole section preparation.During the preparation process,EDTA gel with a concentration of 17% was used to ensure the root canal was moist and smooth.For each withdrawal or use of instruments,2% chlorhexidine solutionand 0.9%Na Cl solution were used to wash in turn,and the initial pointed file was used to file back to avoid debris blocking the root canal.Use timing tools to record the working time of niti equipment for each canal(excluding flushing and swinging time).The preparation of the whole section of root canal was completed with m3-max cleaning and flossing,paper tip drying,calcium hydroxide medicine sealing,and finally temporary sealing paste.The doctor advises the patient to return to the clinic at any time if there is any obvious pain or discomfort.Return to the clinic for one week with no obvious discomfort,and record the presence and degree of pain in the affected tooth.One week later,the filling requirements of the root canal were fulfilled,the temporary sealing and interclinical sealing drugs were removed,the working length was measured to match the appropriate taper tooth tip,and intraoperative X-ray was taken to confirm whether the tooth tip was suitable.After the final washing with2% chlorhexidine solution,the tooth tip was dried and disinfected with zinc oxide iodoform paste,and the root canal was filled with hot tooth glue.X-ray film was taken to confirm the filling result,and the crown defect was closed.Results:(M3-L)group A and group B(M3-PRO),group C(ProTaper for machine)prepared 61 with teeth,group A total of 46 spikes,group B,A total of 45 spikes tube,A total of 42 crew group C tube,the average free time of each root canal were 3.19 ±0.37(min),6.49± 0.32(min)and 8.37± 0.48(min),was statistically significant difference between the three groups,the contrast between two difference have statistical significance.After root canal instrumentation,the incidence of pain in group A(14%),group B(15%),and group C(15%)was not significantly different among the three groups,and there was no statistically significant difference in postoperative pain levels among the three groups.Conclusions:There was no significant difference between M3-L,M3-PRO and machine ProTaper in the degree and incidence of pain after root canal instrumentation.In terms of the average preparation time of each canal,M3-L time was the shortest,M3-PRO time was the second,and ProTaper time was the longest.The differences among the three groups were statistically significant,and the comparison between the two groups was also statistically significant.Compared with M3-PRO and machine ProTaper,M3-L reduced clinical operation time and improved work efficiency.