CAJ | 학술논문

目的:比较Twist File Adaptive(TFA)和ProTaper Universal(PTU)两种镍钛器械系统分别在自适应运动模式和连续旋转模式下预备根管后牙根裂纹的发生率. 方法:收集因正畸减数拔除的100个健康下颌前磨牙,并随机分为5组(n=20). 其中对照组不进行根管预备,4个实验组分别用TFA和PTU两种镍钛器械系统并分别在自适应运动模式和连续旋转模式下预备根管至#25. 预备结束后,在各牙根样本距离根尖3、6、9 mm处横断牙面,并在立体显微镜下观察牙根裂纹的发生情况. 结果:对照组未观察到牙根裂纹的发生,而各实验组均有不同数目的牙根裂纹发生. PTU在两种不同运动模式下的牙根裂纹发生率均明显高于TFA组(P<0. 05);TFA在自适应运动模式下产生的牙根裂纹少于连续旋转模式组(P<0. 05);PTU在两种不同运动模式下的牙根裂纹发生率差异无统计学意义(P>0. 05). 结论:新型镍钛锉TFA相比于传统锉PTU在根管预备后可产生较少的牙根裂纹. 用TFA预备根管时,自适应运动比连续旋转运动产生的牙根裂纹少.
목적:비교Twist File Adaptive(TFA)화ProTaper Universal(PTU)량충얼태기계계통분별재자괄응운동모식화련속선전모식하예비근관후아근렬문적발생솔. 방법:수집인정기감수발제적100개건강하합전마아,병수궤분위5조(n=20). 기중대조조불진행근관예비,4개실험조분별용TFA화PTU량충얼태기계계통병분별재자괄응운동모식화련속선전모식하예비근관지#25. 예비결속후,재각아근양본거리근첨3、6、9 mm처횡단아면,병재입체현미경하관찰아근렬문적발생정황. 결과:대조조미관찰도아근렬문적발생,이각실험조균유불동수목적아근렬문발생. PTU재량충불동운동모식하적아근렬문발생솔균명현고우TFA조(P<0. 05);TFA재자괄응운동모식하산생적아근렬문소우련속선전모식조(P<0. 05);PTU재량충불동운동모식하적아근렬문발생솔차이무통계학의의(P>0. 05). 결론:신형얼태촤TFA상비우전통촤PTU재근관예비후가산생교소적아근렬문. 용TFA예비근관시,자괄응운동비련속선전운동산생적아근렬문소.
AIM:To compare the incidences of tooth root cracks after root canal preparation using Twist File Adaptive( TFA) and ProTaper Universal system ( PTU) with adaptive motion and continuous rotation respectively. METHODS:100 mandibular premolars were randomly divided into 5 groups(n=20). The roots in control group were unprepared. And the other 80 teeth were divided into 4 experimental groups and the root canals were prepared by TFA and PTU to #25 with adaptive motion and continuous rotation respectively. All the roots were sectioned horizontally at 3, 6, and 9 mm from the apex, and the slices were observed by stereomicroscope. The presence of root cracks was not-ed. RESULTS:No root crack was observed in the control group. The incidences of root cracks in PTU groups were significantly higher than those in TFA groups (P<0. 05). The incidence of root cracks was lower in TFA group work-ing with adaptive motion than that with continuous rotation (P<0. 05). There was no statistic difference of root crack incidence between adaptive motion and continuous rotation in PTU groups(P >0. 05). CONCLUSION: The new Twist File Adaptive instruments causes less crack than the traditional ProTaper Universal system. There is less crack using Twist File Adaptive with adaptive motion than that with continuous rotation.