Root-end cavity preparation using the MicroMega Sonic Retro-prep Tip™. SEM analysis |
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Authors: | A LLOYD A JAUNBERZINS P M H DUMMER S BRYANT |
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Institution: | Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, UK |
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Abstract: | The objective of this laboratory study was to compare root-end cavities prepared with sonic Retro-prep tips in a MM 1500 Sonic Air handpiece with those created by burs in a conventional handpiece. A total of 80 single-rooted extracted human teeth with mature apices and straight canals were included in the study. Four groups of 20 extracted teeth were prepared as follows: I, a 3-4 mm root-end resection perpendicular to the long axis of the root, with a size 40 sonic Retro-prep tip creating an apical cavity 3 mm into root canal system; II, a 45° bevel of the root-face removing a 3-4 mm root segment and root-end preparation as per group I; III, root-end resection as per group I, with an apical cavity prepared using a size 010 inverted cone bur 3 mm down the long axis of the root; IV, resection as per group II, followed by an apical cavity preparation with a size 010 inverted cone bur 3 mm into the root canal system. The apical root portion and root-end cavities were replicated and prepared for SEM analysis at × 20 and × 80 magnification. The degree of chipping associated with the margin of the root-end cavities, as evaluated with a standard grading system, and the incidence of root-face cracks were noted. Marginal chipping of root-end cavities prepared using sonic instrumentation was significantly worse than that produced by burs (P<0.001). Perpendicular root-end resections showed significantly better scores than bevelled root-end resections (P<0.005). The incidence of root-face cracking was low with no significant difference between the experimental groups. |
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Keywords: | endodontic surgery marginal chipping root-end resection root-end cavity Retro-prep tip root-face cracking sonic |
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