Kokkas Andreas B, Boutsioukis Asterios Ch, Vassiliadis Leonidas P, Stavrianos Christos K
Department of Endodontology, School of Dentistry, Aristotle University, Thessaloniki, Greece.
J Endod. 2004 Feb;30(2):100-2. doi: 10.1097/00004770-200402000-00009.
The effect of the smear layer on the penetration depth of three different root canal sealers into the dentinal tubules was examined in 64 recently extracted single-rooted teeth. After chemomechanical preparation, the samples were randomly divided in two equal groups. The smear layer remained intact in group A, whereas complete removal of the smear layer was performed in group B. Two roots from each group were used as controls. Ten roots from each group were obturated with laterally condensed gutta-percha points and sealers AH Plus, Apexit, and Roth 811, respectively. Examination in scanning electron microscope revealed that the smear layer obstructed all the sealers from penetrating dentinal tubules. In contrast, smear layer removal allowed the penetration of all sealers to occur to a varying depth. These findings suggest that smear layer plays an important role in sealer penetration into the dentinal tubules, as well as in the potential clinical implications.
在64颗近期拔除的单根牙中，研究了玷污层对三种不同根管封闭剂渗入牙本质小管深度的影响。化学机械预备后，将样本随机分为两组，每组数量相等。A组玷污层保持完整，而B组则完全去除玷污层。每组各取两根牙根作为对照。每组分别用侧向加压牙胶尖和封闭剂AH Plus、Apexit及Roth 811充填10根牙根。扫描电子显微镜检查显示，玷污层阻碍了所有封闭剂渗入牙本质小管。相反，去除玷污层后，所有封闭剂均能不同程度地渗入。这些发现表明，玷污层在封闭剂渗入牙本质小管以及潜在的临床意义方面起着重要作用。
