Department of Restorative Dentistry, Araraquara Dental School, Univ. Estadual Paulista, AraraquaraSP, Brazil.
J Appl Oral Sci. 2013 Jul-Aug;21(4):346-50. doi: 10.1590/1678-775720130034.
The goal of this study was to evaluate the efficacy of the Self-Adjusting File (SAF) and ProTaper for removing calcium hydroxide [Ca(OH)2] from root canals.
Thirty-six human mandibular incisors were instrumented with the ProTaper system up to instrument F2 and filled with a Ca(OH)2-based dressing. After 7 days, specimens were distributed in two groups (n=15) according to the method of Ca(OH)2 removal. Group I (SAF) was irrigated with 5 mL of NaOCl and SAF was used for 30 seconds under constant irrigation with 5 mL of NaOCl using the Vatea irrigation device, followed by irrigation with 3 mL of EDTA and 5 mL of NaOCl. Group II (ProTaper) was irrigated with 5 mL of NaOCl, the F2 instrument was used for 30 seconds, followed by irrigation with 5 mL of NaOCl, 3 mL of EDTA, and 5 mL of NaOCl. In 3 teeth Ca(OH)2 was not removed (positive control) and in 3 teeth canals were not filled with Ca(OH)2 (negative control). Teeth were sectioned and prepared for the scanning electron microscopy. The amounts of residual Ca(OH)2 were evaluated in the middle and apical thirds using a 5-score system.
None of the techniques completely removed the Ca(OH)2 dressing. No difference was observed between SAF and ProTaper in removing Ca(OH)2 in the middle (P=0.11) and the apical (P=0.23) thirds.
The SAF system showed similar efficacy to rotary instrument for removal of Ca(OH)2 from mandibular incisor root canals.
本研究旨在评估 Self-Adjusting File（ SAF ）和 ProTaper 清除根管内氢氧化钙（ Ca(OH)2 ）的效果。
36 颗下颌切牙用 ProTaper 系统根管预备至 F2 ，并用 Ca(OH)2 基糊剂填充。7 天后，根据 Ca(OH)2 去除方法将标本分为两组（ n =15 ）。组 I （ SAF ）用 5 mL 的 NaOCl 冲洗，并用 Vatea 冲洗装置在持续 5 mL 的 NaOCl 冲洗下用 SAF 冲洗 30 秒，然后用 3 mL 的 EDTA 和 5 mL 的 NaOCl 冲洗。组 II （ ProTaper ）用 5 mL 的 NaOCl 冲洗，用 F2 器械冲洗 30 秒，然后用 5 mL 的 NaOCl 、 3 mL 的 EDTA 和 5 mL 的 NaOCl 冲洗。3 颗牙未去除 Ca(OH)2 （阳性对照），3 颗牙未用 Ca(OH)2 填充（阴性对照）。牙齿被切片并准备用于扫描电子显微镜检查。使用 5 分制系统评估中、根尖 3 段残留 Ca(OH)2 的量。
没有一种技术能完全去除 Ca(OH)2 糊剂。在去除中（ P=0.11 ）和根尖（ P=0.23 ） 3 段的 Ca(OH)2 时， SAF 和 ProTaper 之间没有差异。
SAF 系统在去除下颌切牙根管内的 Ca(OH)2 方面与旋转器械具有相似的效果。
