Three Kinds Of Nickel-titanium Instrument Of Root Canal Adaptability Research Of The Initial Working Width

OBJECTIVE:Because of anterior tooth and premolar root canal initial work width is bigger,many experts and manufacturers in guiding nickel-titanium instrument use andpromote pointed out that any such teeth root canal without perfect root canalpreliminary preparation. In order to solve this problem, we use at present in the mostcommon clinical Protaper Mtwo, Reciproc nickel titanium system of the first file intothe original root canal, through X-ray observation of it into the maximum depth, toevaluate nickel-titanium instrument and the root canal initial work width ofadaptability, for selecting rational in the process of clinical root canal preparationequipment provides the basis. At the same time, contrast in Pathfile nickel-titaniuminstrument after root canal preliminary preparation of the above three kinds ofnickel-titanium instrument first file into the depth of the root canal, to explore thenickel-titanium instrument in the necessity of preliminary preparation before rootcanal preparation.MATERIALS AND METHODS:1. Collect on adult mandibular incisor in jilin area, lateral incisor teeth, the firstpremolar, the second premolar and the first molar and second molar each10, afterpreprocessing and cut crown will Protaper nickel titanium system of S1number10,Mtwo nickel titanium system file,25of Reciproc nickel titanium system file Numbersfor P, M, R, respectively, in keeping the root canal under the original form ofmanually inserted into the selected respectively in vitro teeth, feel resistance to stopthe inserts, in accordance with the long focal length parallel exposure technology,X-ray films imported DFW digital imaging software system, measuring the nickeltitanium file of the anatomy of the tips from the root hole length L1.2. Will all of these in vitro dental Pathfile nickel-titanium instrument after root canal preliminary preparation, then insert the P, M, R manual respectively to theselected in vitro teeth, feel resistance to stop the inserts, in accordance with the longfocal length parallel exposure technology, X-ray films imported DFW digital imagingsoftware system, measuring the nickel titanium file tips from the length of theanatomy of root hole L2. With the instrument into the original root canal comparingmeasured length L1, the two groups of experiment results for statistical analysis.RESULTS:1. In the maxillary lateral incisors, maxillary first molars MB, DB, maxillarysecond molar MB, DB, the mandibular incisor, mandibular lateral incisors andmandibular first molars MB, ML, mandibular second molar with MB, ML root canalin the preliminary preparation and synergy between three types of nickel-titaniuminstrument (P <0.001), namely the root canal after the preliminary preparation for allkinds of the use effect of nickel-titanium instrument.2. Experiments are conducted with all groups in vitro teeth whether root canalpreliminary preparation, nickel-titanium instrument type for the measured valuedifference was statistically significant (P <0.001). The use effect of various types ofnickel-titanium instrument using LSD method are compared, and two by the averageavailable: M file into the largest primitive root canal depth and P file times, R file isminimal. In maxillary incisor, maxillary teeth and maxillary first molar P, maxillarysecond molar P, jaw teeth and mandibular first premolar, the mandibular secondpremolar, the mandibular first molar D, mandibular second molar root canal in themeasured M D file tips from anatomical root mean value is less than0.5mm holelength, hole is beyond the physiological root tip, show M file and the root canal initialwidth work adaptability is poor, maxillary canines include P file here.3. In the maxillary teeth and maxillary first molars, maxillary second molar andthe mandibular incisor, mandibular lateral incisors and mandibular first molars andmandibular second molar root canal, regardless of the initial preparation and threetypes of nickel-titanium instrument, whether there is synergy between root canalpreparation and not to conduct a preliminary preparation of measured value differencewas statistically significant (P <0.001), of which the maxillary canines group using single factor analysis.CONCLUSIONS:1. Whether or not to all groups in vitro teeth root canal preliminary preparation,three kinds of nickel and titanium in the system as the first equipment into the rootcanal, Mtwo10file into the depth of the root canal is the largest, followed by ProtaperS1file, file and Reciproc25th the effect not beautiful. Among them in the maxillaryincisor, maxillary canines, maxillary first molars P, maxillary second molar P, jawteeth and mandibular first premolar, the mandibular second premolar, the mandibularfirst molar D, found in mandibular second molar root canal D Mtwo nickel-titaniuminstrument number10file with the root canal initial width is not flexible, work heremaxillary canines group also includes Protaper S1number file.2. In the maxillary teeth and maxillary first molars, maxillary second molar andthe mandibular incisor, mandibular lateral incisors and mandibular first molars andmandibular second molar root canal, using Pathfile nickel titanium equipment forpreliminary preparation and root canal did not exist differences between root canalpreliminary preparation, after the preliminary preparation effect is better. After rootcanal preliminary preparation, and root canal did not exist differences between rootcanal preliminary preparation, after the preliminary preparation effect is better. Afterroot canal preliminary preparation, Protaper S1number file and Mtwo10file againinto the depth of the root canal Rrciproc25file is obvious.3. In this experiment, Reciproc single file systems with a25file with the above14set of tooth root canal the initial width of adaptability, compared with other twokinds of conventional nickel-titanium instrument is a bit poor.