Removal of Radioactively Marked Calcium Hydroxide from the Root Canal: Influence of Volume of Irrigation and Activation

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• 作者：José ; Zorzin ; Dr med dent ; Jessica Wieß ; ner ; Dr med dent ; Thomas Wieß ; ner ; Dr med dent ; Ulrich Lohbauer ; Prof Dr Ing ; Anselm Petschelt ; Prof Dr med dent ; Johannes Ebert ; Dr med dent ; ^{ebert@dent.uni-erlangen.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：calcium hydroxide ; CanalBrush ; intracanal medicament ; passive ultrasonic irrigation ; radioactively marked glucose
• 刊名：Journal of Endodontics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：4
• 页码：637-640
• 全文大小：182 K

文摘

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.

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.

Results

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).

Conclusions

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.