In vitro comparison of three different lengths of remaining gutta-percha for establishment of apical seal after post-space preparation

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The quality of apical seal with regard to the length of remaining gutta-percha following post-space preparation is still controversial. The purpose of this <I>in vitro</I> study was to compare three different lengths of remaining gutta-percha for apical seal after post-space preparation. A total of 126 single-rooted extracted maxillary human anterior teeth with intact apices, straight roots, and without resorption were used in this study. The root canals were prepared and filled with gutta-percha and AH26 sealer. The post-space preparation was accomplished. Ninety-six teeth were randomly divided into three groups (4, 5 and 6 mm of gutta-percha was retained in group 1, 2 and 3, respectively).Thirty teeth were considered for the control groups in which 5 teeth served as positive and 5 teeth served as negative controls. The specimens were placed in India ink for 48 hours and then divided into two halves. The amount of leakage was observed and measured with a stereomicroscope at × 16 magnification and 0.1 mm accuracy. The results showed that there were significant differences among the three experimental groups (<I>P</I> < 0.05). The best apical seal after post-space preparation was associated with the maximum length of remaining gutta-percha in the apical portion of the treated teeth. (J. Oral Sci. 50, 435-439, 2008)