Influence of therapeutic cancer radiation on the bond strength of an epoxy- or an MTA-based sealer to root dentine

Aim To evaluate the influence of radiation on root canal sealer push‐out bond strength to dentine and sealer/dentine interface in teeth filled with AH Plus (Dentsply Ind. Com. Ltda, Petrópolis, RJ, Brazil) and MTA Fillapex (Angelus Ind. Prod. Odontológicos S/A, Londrina, PR, Brazil). Methodology Thi...

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Published in:International endodontic journal Vol. 49; no. 11; pp. 1065 - 1072
Main Authors: Martins, C. V., Leoni, G. B., Oliveira, H. F., Arid, J., Queiroz, A. M., Silva, L. A. B., Sousa-Neto, M. D.
Format: Journal Article
Language:English
Published: England Blackwell Publishing Ltd 01-11-2016
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Summary:Aim To evaluate the influence of radiation on root canal sealer push‐out bond strength to dentine and sealer/dentine interface in teeth filled with AH Plus (Dentsply Ind. Com. Ltda, Petrópolis, RJ, Brazil) and MTA Fillapex (Angelus Ind. Prod. Odontológicos S/A, Londrina, PR, Brazil). Methodology Thirty‐two maxillary canines were selected and randomly assigned to 2 groups (n = 16): one group was not irradiated, and the other was subjected to a cumulative radiation dose of 60 Gy. Root canals were prepared with the Reciproc system (VDW GmbH, Munich, Germany), and each group was divided into 2 subgroups (n = 8) according to the sealer – AH Plus or MTA Fillapex – using the single‐cone filling technique. Then, 1‐mm‐thick dentine slices were obtained from each root third for the push‐out test to evaluate sealer bond strength to dentine and for scanning electron microscopy (SEM) to examine the sealer/dentine interface. Failure mode after debonding was determined with a stereomicroscope at ×25 magnification. Bond strength data were analysed by two‐way anova with a split‐plot design and post hoc Tukey's test (α = 0.05). Results Significantly lower bond strength (P < 0.0001) was obtained after irradiation (0.71 ± 0.20 versus 0.97 ± 0.29 MPa) and in specimens filled with MTA Fillapex (0.70 ± 0.18 MPa) compared with AH Plus (1.00 ± 0.27 MPa). Percentage of adhesive failures increased after radiation in all root thirds in the teeth filled with AH Plus. SEM revealed more gap‐containing regions and fewer tags at the sealer/dentine interface in irradiated specimens, with more tag formation and fewer gaps with AH Plus sealer. Conclusions Radiation was associated with a decrease in the push‐out bond strength of sealers to intraradicular dentine and formation of more gaps and fewer tags at the sealer/dentine interface regardless of the sealer.
Bibliography:ark:/67375/WNG-Q605L6WD-M
istex:8777F9E221DE2323B4AEF7126B1A8B3C3AAC02CD
ArticleID:IEJ12556
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0143-2885
1365-2591
DOI:10.1111/iej.12556