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Effect of retained fractured instruments on tooth resistance to vertical fracture with or without attempt at removal
Author(s) -
Madarati A. A.,
Qualtrough A. J. E.,
Watts D. C.
Publication year - 2010
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2010.01783.x
Subject(s) - mineral trioxide aggregate , dentistry , root canal , premolar , fracture (geology) , gutta percha , coronal plane , orthodontics , materials science , significant difference , mathematics , medicine , molar , composite material , radiology , statistics
Madarati AA, Qualtrough AJE, Watts DC. Effect of retained fractured instruments on tooth resistance to vertical fracture with or without attempt at removal. International Endodontic Journal , 43 , 1047–1053, 2010. Abstract Aims To investigate the effect of retained fractured endodontic instruments on root strength and to evaluate the effectiveness of several root filling materials in reinforcing roots that had undergone unsuccessful attempt at removal of fractured instruments. Methodology Seventy five mandibular premolar roots were divided into five groups. In group A ( control ), canals were prepared to a size F5‐ProTaper instrument and filled with gutta‐percha and TubliSeal sealer fragments. In the experimental groups (B, C, D and E), 4 mm of F5‐ProTaper instruments were fractured in the apical one‐third of the canal and then treated as follows: in group B, the fragments were left in situ without attempt at removal, and canals were filled with gutta‐percha and TubliSeal sealer ( GP No Removal ). In groups C, D and E, an attempt at removal of the fragment was simulated by preparing a staging platform coronal to the fragment using modified Gates Glidden burs (No 2–5). Canals in group C were filled with gutta‐percha and TubliSeal sealer ( GP Removal ), group D filled with Resilon ( Resilon Removal ) and group E with mineral trioxide aggregate ( MTA Removal ). Roots then underwent vertical fracture. Data were analysed using the one‐way anova at P < 0.05. Results Roots in the GP Removal group had significantly lower values for mean force for fracture (404.9 N). There was no significant difference between the control group and GP No Removal (765.2 and 707.8, respectively). Resilon Removal and MTA Removal groups (577.3 and 566.6 N) were not significantly different from the GP No Removal group. Conclusions Leaving fractured instruments in the apical one‐third of the canal does not appear to affect the resistance of the root to vertical fracture; Resilon and MTA appear to compensate for root dentine loss that occurred as a consequence of attempts at retrieval of fractured instruments when used as canal filling materials.