Mahran Abeer H, AboEl-Fotouh Mona M
Endodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Endod. 2008 Oct;34(10):1219-22. doi: 10.1016/j.joen.2008.06.022. Epub 2008 Aug 23.
The purpose of this study was to compare the effects of 3 different instruments used to prepare curved root canals on the remaining cervical dentin thickness and total amount of dentin removed from root canals during instrumentation by using multislice computed tomography. Mesiobuccal canals of 45 mandibular first molars with curvature between 30-40 degrees were divided into 3 equal groups: ProTaper, Hero Shaper, and Gates Glidden Bur with Flex-R hand file. Cervical dentin thickness and canal volume were measured before and after instrumentation by using multislice computed tomography and image analysis software. The results indicated that ProTaper removed significantly less cervical dentin from distal wall of the root (dangerous zone) than HeroShaper and Gates Glidden Bur (P < .05). The total dentin removed during canal instrumentation was significantly more with ProTaper system (P < .05).
本研究的目的是通过使用多层计算机断层扫描，比较3种用于预备弯曲根管的不同器械在根管预备过程中对剩余颈缘牙本质厚度以及从根管中去除的牙本质总量的影响。将45颗弯曲度在30 - 40度之间的下颌第一磨牙的近中颊根管分为3组，每组15颗：ProTaper组、Hero Shaper组和使用Flex - R手用锉的Gates Glidden钻针组。使用多层计算机断层扫描和图像分析软件在根管预备前后测量颈缘牙本质厚度和根管容积。结果表明，ProTaper从牙根远中壁（危险区）去除的颈缘牙本质明显少于Hero Shaper和Gates Glidden钻针（P < 0.05）。使用ProTaper系统在根管预备过程中去除的牙本质总量明显更多（P < 0.05）。
