论文部分内容阅读
目的探讨镍钛根管器械表面镀膜后是否能提高镍钛根管器械的抗腐蚀性,从而提高其使用寿命。方法共选用8套Mtwo镍钛器械(每套型号为10号,0.04锥度;15号,0.05锥度;20号,0.06锥度;25号,0.06锥度),随机分为4组(A1、A2、B1、B2),每组2套器械,共8只。A1、A2组不做任何处理,B1、B2组进行镀膜。A1、B1组采用5.25%Na OCl作为根管预备过程中的冲洗液;A2、B2组用2.5%Na OCl作为根管预备过程中的冲洗液。通过多弧离子镀膜机将Ti Zr NO作为阴极电弧蒸发靶原,在B1、B2组Mtwo镍钛器械表面制备一层均匀的0.4μm厚的膜层。选取2014年8月至2015年8月于中国医科大学附属口腔医院门诊就诊患者拔除的单根牙共80颗,均根尖发育完好、15号K锉到达根尖口且有摩擦感,截去牙冠,留取根尖至釉牙骨质界13~15 mm。每套器械分别进行根管预备,每次预备1个根管,每换一支锉用冲洗液冲洗根管,预备后放入超声荡洗机内荡洗,封袋高温高压消毒。每套器械预备10个根管。扫描电镜下观察镀膜器械和未镀膜器械,保留图片。最后将每只镍钛器械进行电化学实验,通过恒电位仪获得极化曲线。结果扫描电镜结果,镀膜镍钛合金根管器械表面性状较未镀膜器械高,电化学测试镀膜镍钛合金根管器械腐蚀速率较未镀膜镍钛器械显著降低。结论镀膜技术对镍钛合金根管器械进行表面改性可以改善器械表面性状,提高其耐腐蚀性。
Objective To investigate whether the surface of nickel-titanium root canal instruments can improve the corrosion resistance of nickel-titanium root canal instruments and improve the service life. Methods A total of 8 sets of Mtwo NiTi instruments (each model No. 10, 0.04 taper; No. 15, 0.05 taper; No. 20, 0.06 taper; No. 25 and 0.06 taper) were selected and randomly divided into 4 groups (A1, A2, , B2), two sets of equipment for each group, a total of eight. A1, A2 group did not do any processing, B1, B2 group coating. A1 and B1 groups used 5.25% Na OCl as irrigation fluid in root canal preparation; A2 and B2 groups used 2.5% Na OCl as irrigation fluid in root canal preparation. Ti Zr NO was used as target for cathodic arc evaporation by a multi-arc ion plating machine to form a uniform layer of 0.4 μm thickness on the surface of Mtwo Ni-Ti instruments in groups B1 and B2. Select from August 2014 to August 2015 at the China Medical University Stomatological Hospital outpatient treatment of patients with a single tooth extraction of a total of 80, are root tip development well, 15 K file reaches the apical and friction, cut off Crown, retaining root tip to enamel cementum 13 ~ 15 mm. Each set of instruments for root canal preparation, each preparation of a root canal, each for a file with irrigation fluid irrigation root canal preparation, into the ultrasonic washing machine after washing, sealing high temperature and pressure disinfection. Prepare 10 root canals for each set of instruments. Scanning electron microscope observation of coated instruments and uncoated instruments, keep the picture. Finally, each Ni-Ti instrument for electrochemical experiments, obtained by potentiostatic polarization curve. Results The results of scanning electron microscopy showed that the surface properties of coated nickel-titanium alloy root canal instruments were higher than those of uncoated instruments. The corrosion rate of nickel-titanium alloy root canal instruments with electrochemical tests was significantly lower than that of uncoated nickel-titanium instruments. Conclusion The surface modification of nickel-titanium alloy root canal instruments by coating technique can improve the surface properties of instruments and improve their corrosion resistance.