Simcock Richard M, Hicks M Lamar
I. B. Bender Division of Endodontics, Albert Einstein Medical Center, Philadelphia, Pennsylvania, USA.
J Endod. 2006 Jul;32(7):680-2. doi: 10.1016/j.joen.2006.01.009. Epub 2006 Apr 4.
This study compared the weight and radiographic appearance of Ca(OH)(2) delivered into standardized, minimally and fully prepared canals using (a) an injection system, (b) an endodontic Flex-O file rotated counter-clockwise, (c) a lentulo spiral, and (d) a .04 rotary NiTi file rotated in reverse. Two extracted human second mandibular premolars with single canals were prepared to an MAF #25 or an MAF #40. A weight measurement and radiograph were made for each filling. Three independent examiners evaluated the radiographs. Regardless of technique, only about 45% of the optimal weight of Ca(OH)(2) was delivered into the minimally prepared canal. Radiographically the filling quality was only 1 to 2 (10 scale). In contrast, all delivery techniques delivered near optimal weight of Ca(OH)(2) in the completely prepared canal with a radiographic filling quality of 8.8 to 9.3. The results indicate that complete instrumentation is needed to obtain near optimal delivery of Ca(OH)(2).
本研究比较了使用以下方法将氢氧化钙输送到标准化、轻度预备和完全预备根管中的重量及影像学表现：(a) 注射系统；(b) 逆时针旋转的根管Flex - O锉；(c) 慢锥钻；(d) 反向旋转的0.04旋转镍钛锉。选取两颗拔除的单根管人类下颌第二前磨牙，预备至MAF #25或MAF #40。对每次充填进行重量测量和影像学检查。由三名独立检查者评估影像学图像。无论采用何种技术，在轻度预备的根管中，仅约45%的最佳氢氧化钙重量被输送进去。影像学显示充填质量仅为1至2（10分制）。相比之下，在完全预备的根管中，所有输送技术输送的氢氧化钙重量接近最佳值，影像学充填质量为8.8至9.3。结果表明，需要进行完全的根管预备才能使氢氧化钙的输送接近最佳状态。
