Zorzin José, Wießner Jessica, Wießner Thomas, Lohbauer Ulrich, Petschelt Anselm, Ebert Johannes
Dental Clinic 1, Department of Operative Dentistry and Periodontology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.
Dental Clinic 1, Department of Operative Dentistry and Periodontology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.
J Endod. 2016 Apr;42(4):637-40. doi: 10.1016/j.joen.2016.01.005. Epub 2016 Feb 20.
The purpose of this study was to evaluate the amount of calcium hydroxide (Ca[OH]2) removed by irrigation with different volumes and activation methods.
One hundred thirty extracted straight, single-rooted human teeth were instrumented to size 45/.04. One hundred twenty teeth were filled with radioactively marked Ca(OH)2 and a gutta-percha point; 10 teeth with only gutta-percha served as a negative control. All specimens were stored in saline solution (7 days at 35°C). After storage, teeth were randomly divided into 12 groups (n = 10). The gutta-percha was taken out, and Ca(OH)2 was removed either by irrigation with different volumes (0 mL, 0.5 mL, 1 mL, 2 mL, 4 mL, or 8 mL) or mechanical activation with a 2- or 4-mL volume using a file (Instr) (FlexMaster size 45/.04; VDW, Munich, Germany), a brush (CanalBrush [CB]; Coltène/Whaledent, Langenau, Germany), or passive ultrasonic irrigation (PUI, smooth wire). Irrigation was performed by alternating 40% citric acid and 3% sodium hypochlorite. Residual Ca(OH)2 was measured by scintillation and expressed as a percentage of the original Ca(OH)2.
Increasing the irrigation volume led to a significant decrease (P < .05) of residual Ca(OH)2 (0 mL [98.5%], 0.5 mL [21.7%], 1 mL [16.5%], 2 mL [12.9%], 4 mL [8.7%], 8 mL [5.0%], and negative control [0.0%]). Activation led to less residual Ca(OH)2 (2 mL Instr [12.0%], 2 mL CB [11.7%], 2 mL PUI [9.1%], 4 mL Instr [8.5%], 4 mL CB [7.4%], and 4 mL PUI [6.2%]), with significant differences according to the PUI (P < .05).
No irrigation procedure was able to remove Ca(OH)2 completely. PUI was the most effective activation method. However, irrigation with an 8-mL volume was the most effective.
本研究的目的是评估不同冲洗量和激活方法冲洗去除的氢氧化钙（Ca[OH]₂）量。
选取130颗拔除的人直单根牙，预备至45/.04号。120颗牙用放射性标记的Ca(OH)₂和一根牙胶尖充填；10颗仅充填牙胶的牙作为阴性对照。所有标本置于盐溶液中（35°C下7天）。储存后，将牙齿随机分为12组（n = 10）。取出牙胶尖，通过不同冲洗量（0 mL、0.5 mL、1 mL、2 mL、4 mL或8 mL）冲洗或用锉（Instr）（FlexMaster 45/.04号；VDW，慕尼黑，德国）、刷（根管刷[CB]；Coltène/Whaledent，朗根瑙，德国）或被动超声冲洗（PUI，光滑锉）以2 mL或4 mL的量进行机械激活来去除Ca(OH)₂。冲洗交替使用40%柠檬酸和3%次氯酸钠。通过闪烁法测量残余Ca(OH)₂，并以原始Ca(OH)₂的百分比表示。
增加冲洗量导致残余Ca(OH)₂显著减少（P <.05）（0 mL[98.5%]、0.5 mL[21.7%]、1 mL[16.5%]、2 mL[12.9%]、4 mL[8.7%]、8 mL[5.0%]，阴性对照[0.0%]）。激活导致残余Ca(OH)₂减少（2 mL Instr[12.0%]、2 mL CB[11.7%]、2 mL PUI[9.1%]、4 mL Instr[8.5%]、4 mL CB[7.4%]、4 mL PUI[6.2%]），根据PUI有显著差异（P <.05）。
没有冲洗程序能够完全去除Ca(OH)₂。PUI是最有效的激活方法。然而，8 mL冲洗量是最有效的。
