Radhika Etta, Reddy E Rajendra, Rani S Thabitha, Kumar Labishetty Vinay, Manjula M, Mohan Tulluru Ajay
Government dental college, Afzalgunj, Hyderabad, Department of Pedodontics and Preventive Dentistry, Kamineni Institute of Dental Sciences, Narketpally, Telangana, India.
Department of Pedodontics and Preventive Dentistry, Kamineni Institute of Dental Sciences, Narketpally, Telangana, India.
Pediatr Dent. 2017 Jul 15;39(4):319-323.
The purpose of this study was to compare canal transportation, centering ability, and removed dentin thickness (RDT) using hand nickel-titanium (NiTi) K-flex files and rotary systems in primary molars and using cone beam computed tomography (CBCT).
This study was conducted on 20 primary maxillary and 20 primary mandibular molars, which were randomly divided into two groups to be instrumented with hand NiTi K-flex files and a rotary system. Pre- and post-instrumentation slices were taken at three predetermined levels using CBCT to evaluate all the parameters by using Digital Imaging Communications in Medicine (DICOM) software. The results were statistically evaluated.
Rotary instruments caused significantly less canal transportation and showed more centering ability than hand NiTi instruments at all levels and in all directions, except at the cervical level in the mesiodistal direction, where the hand group showed significantly superior results. The hand NiTi K-flex files removed significantly more dentin than rotary instrumentation at all levels and in all directions, except at the apical level in the buccodistal direction, where no significant difference between the two groups was observed.
Rotary files showed less canal transportation, more conservation of tooth structure, and superior centering ability compared to hand nickel-titanium K-flex files.
本研究旨在使用锥形束计算机断层扫描（CBCT），比较在乳牙磨牙中使用手动镍钛（NiTi）K-flex锉和旋转系统时的根管偏移、就位能力和牙本质去除厚度（RDT）。
本研究对20颗上颌乳牙和20颗下颌乳牙进行，随机分为两组，分别用手动NiTi K-flex锉和旋转系统进行预备。使用CBCT在三个预定水平获取预备前和预备后的切片，通过医学数字成像和通信（DICOM）软件评估所有参数。对结果进行统计学评估。
在所有水平和所有方向上，旋转器械导致的根管偏移明显更少，就位能力更强，但在近远中方向的颈部水平除外，在该水平手动组的结果明显更优。在所有水平和所有方向上，手动NiTi K-flex锉去除的牙本质明显多于旋转器械，但在颊远中方向的根尖水平除外，在该水平两组之间未观察到显著差异。
与手动镍钛K-flex锉相比，旋转锉显示出更少的根管偏移、更多的牙体结构保留和更好的就位能力。
