Ahlquist M, Henningsson O, Hultenby K, Ohlin J
Department of Cariology and Endodontology, Karolinska Institute, Huddinge, Sweden.
Int Endod J. 2001 Oct;34(7):533-7. doi: 10.1046/j.1365-2591.2001.00429.x.
The purpose of this scanning electron microscope (SEM) study was to compare the cleanliness of the root canal walls following either a manual or a rotary technique of canal instrumentation. The hypothesis was that a rotary technique would produce a cleaner root canal.
Manual filing was performed on 10 extracted teeth using stainless steel S-files (Sjodings, Sendoline, Sweden). Powered instrumentation was carried out on a further 10 extracted teeth, using ProFile rotary nickel-titanium files in a handpiece (250 r.p.m.) according to the manufacturer's instructions. A solution of 0.5% sodium hypochlorite was used for irrigation. The roots were cut longitudinally and the canal walls were examined for debris and smear layer at the apical, middle and coronal level.
Significantly less debris was found in the apical region using the manual filing technique (P < 0.05); no significant differences could be found at the other levels. Overall, significantly less debris was found on the root canal walls using the manual technique when the data from the three levels were compared (P = < 0.05).
The manual technique employed in this study produced cleaner root canal walls than the rotary ProFile technique.
本扫描电子显微镜（SEM）研究的目的是比较根管预备的手动技术和旋转技术后根管壁的清洁度。假设是旋转技术会使根管更清洁。
使用不锈钢S锉（Sjodings，Sendoline，瑞典）对10颗离体牙进行手动锉削。根据制造商的说明，使用ProFile旋转镍钛锉在手机（250转/分钟）中对另外10颗离体牙进行动力预备。使用0.5%次氯酸钠溶液进行冲洗。将牙根纵向切开，在根尖、中部和冠部水平检查根管壁上的碎屑和玷污层。
使用手动锉削技术在根尖区域发现的碎屑明显较少（P<0.05）；在其他水平未发现显著差异。总体而言，当比较三个水平的数据时，使用手动技术在根管壁上发现的碎屑明显较少（P =<0.05）。
本研究中使用的手动技术比旋转ProFile技术产生更清洁的根管壁。
