Document Detail

Root-end cavity preparation using the MicroMega Sonic Retro-prep Tip. SEM analysis.
MedLine Citation:
PMID:  9206411     Owner:  NLM     Status:  MEDLINE    
The objective of this laboratory study was to compare root-end cavities prepared with sonic Retro-prep tips in a MM1500 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 degrees 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 x 20 and x 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.
A Lloyd; A Jaunberzins; P M Dummer; S Bryant
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  International endodontic journal     Volume:  29     ISSN:  0143-2885     ISO Abbreviation:  Int Endod J     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1997-07-10     Completed Date:  1997-07-10     Revised Date:  2008-08-07    
Medline Journal Info:
Nlm Unique ID:  8004996     Medline TA:  Int Endod J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  295-301     Citation Subset:  D    
Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, UK.
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MeSH Terms
Dental Instruments*
Dental Pulp Cavity / injuries,  ultrastructure*
Evaluation Studies as Topic
Microscopy, Electron, Scanning
Retrograde Obturation / instrumentation*
Root Canal Preparation / instrumentation*
Sonication / instrumentation
Statistics, Nonparametric
Tooth Apex / injuries,  ultrastructure*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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