ProTaper手用镍钛器械预备弯曲根管的临床评价

目的]观察ProTaper手用镍钛器械预备弯曲根管的临床效果。方法]120例患者分为2组，每组患牙60个。对照组患牙用不锈钢K锉以标准的逐步深入法进行根管预备；实验组患牙用镍钛手用旋转器械以冠根向深入法进行根管预备。拍摄X线片，观察预备后根管的形态、根管充填效果；记录根管预备后器械折断、变形情况。1周后复诊，评价患牙的疼痛发生率。结果]预备后根管不良形态的发生率，对照组为53．33％，实验组为3．33％；根充适充率，对照组为63．33％，实验组为86．67％；根充后疼痛发生率。对照组为75．00％，实验组为11．67％；断针率实验组为2．78％，对照组为0；器械变形率实验组为0，对照组为41．67％。结论]ProTaper手用镍钛器械器械具有根管成型效果佳、恰充率高、根管预备后疼痛发生率低、器械折断率低等优点，适用于弯曲根管的预备。

Clinical evaluation of ProTaper Ni Ti hand instruments in preparation of curved root canals

Objective] To investigate the clinical effects of ProTaper Ni Ti hand instruments in preparation of curved root canals.Methods] One hundred and twenty root canals of 120 patients were equally divided into two groups at random.The cases in experimental group were instrumented by ProTaper Ni Ti hand files using ProTaper technique(NT group);those in control group were instrumented by stainless steel hand K-files using Step-down technique(SS group).The shape of root canal and effects of obturation were evaluated with radiographs during and after operation.The incidence of post-operative pain and the rate of instrument fracture were recorded.Results]The rate of root canal deformity after preparation was 53.33% in control group and 3.33% in Ni Ti group.86.67% of the canals in Ni Ti group were properly obturated as compared with 63.33% in control group.The incidence of post-operative pain were 11.67% in Ni Ti group while 75% in control group.The rate of instrument fracture in Ni Ti group was 2.78%.The rate of instrument deformity in control group was 41.67%.Conclusions] Under clinical conditions,ProTaper Ni Ti hand instruments can prepare root canal effectively and safely,the ProTaper Ni Ti hand instrumentation technique is an efficient root canal preparation method for curved canals.But fracture of the instrument should be avoided.