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http://dx.doi.org/10.5395/JKACD.2006.31.3.186

Effect of two different calcium hydroxide paste removal techniques on apical leakage: an electrochemical study  

Park, Chan-Je (Department of Conservative Dentistry, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Jeon, Kyung-A (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
Kwon, Ho-Beom (Department of Prosthodontics, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Publication Information
Restorative Dentistry and Endodontics / v.31, no.3, 2006 , pp. 186-191 More about this Journal
Abstract
This study evaluated the effect of two different calcium hydroxide ($Ca(OH)_2$) paste removal techniques on the apical leakage of canals obturated with gutta percha cones and sealer after removing a $Ca(OH)_2$ dressing using an electrochemical method. Seventy extracted single-rooted teeth were instrumented on with Profile rotary files under NaOCl irrigation. Fifty-eight canals were filled with calcium hydroxide paste, which was then removed using one of the following two techniques. In group A, calcium hydroxide was removed using only NaOCl irrigation, and in group B, the canals were re-prepared with a Profile rotary files-one size larger than the previous instrument and were irrigated with NaOCl. In both groups, the root surfaces were coated twice with nail varnish from CEJ to an area 4 mm away from the apex after canal obturation. Apical leakage was measured using an electrochemical method for 24 days. All the specimens showed leakage that increased markedly in the first three days. There was no significant difference between the two groups (p>0.05). The effect of two calcium hydroxide paste removal techniques on the apical leakage was not different during a short period.
Keywords
Calcium hydroxide; Removal technique; Apical leakage; Electrochemical method;
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