AUTORI: Lussi A, Imwinkelried S, Stich H
Aim To evaluate and compare the sealing quality of hand and vacuum obturated root canals after hand preparation or hydrodynamic cleansing of root canals, respectively.
Methodology After assessing root curvature, 96 single-rooted deep frozen teeth were divided into eight comparable groups. The root canals of four groups were instrumented with the balance forced technique. The remaining uninstrumented teeth were connected to a reduced-pressure device (NIT) and the root-canal system perfused with 2.5% NaOCl under under alternating pressure fields. This dissolved the pulpal tissues and removed debris from the root-canal system. The canals of the hand instrumented groups were obturated using the cold lateral condensation method with gutta-percha and one of four different sealers (AH26, AH Plus, Apexit and Pulp Canal Sealer EWT). The teeth treated with the alternating pressure device (NIT) were obturated by a vacuum obturation method (NIT) with the same four sealers. The quality of the coronal seal was assessed using a dye penetration method. In order to minimize errors the roots were perfused with water b efore e3xposure to the dye, under vacuum. The teeth then rendered transparent and the depth of penetration of the dye between the wall of the canal and the obturation material was measured with a stereomicroscope.
Results The canals cleaned and filled by NIT showed statistically significantly less dye penetration than those obturated by lateral condensation (P < 0.05). Within the NIT group, Pulp Canal Sealer EWT exhibited significantly more dye penetration than Apexit. Amongst the control lateral condensation groups no significant differences were found between the various sealers.
Conclusions The present investigation demonstrated the validity of the NIT obturatio method in combination with commonly used root-canal sealers.
Clanak u celini mozete preuzeti ovde.