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Influence of Therapeutic Cancer Radiation on the Push out Bond Strength of Three Root Canal Sealers
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  • Keerthana Kunaparaju,
  • Karthik Shetty,
  • PU Prakash Saxena,
  • Dilson Lobo,
  • Srikant Natarajan
Keerthana Kunaparaju
Manipal College of Dental Sciences
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Karthik Shetty
Manipal College of Dental Sciences

Corresponding Author:[email protected]

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PU Prakash Saxena
Kasturba Medical College Manipal
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Dilson Lobo
Kasturba Medical College Mangalore
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Srikant Natarajan
Manipal College of Dental Sciences
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Abstract

Objectives: The current in-vitro study evaluated the push out bond strength of three root canal sealers and the sealer/dentine interface under SEM in teeth subjected to radiation. Methods: Eight mandibular single rooted premolars were selected and divided into irradiated and non-irradiated groups. Three middle third root sections from each tooth were obtained and three canal like holes were drilled followed by immersion in 2.5% NaOCl for 15 minutes and distilled water. Each hole in the sample was filled with a different sealer and incubated at 37°C for 7 days. After setting, push out bond strength test was performed using universal testing machine followed by failure mode analysis under compound microscope and SEM. The results were subjected to the normality tests (Shapiro–Wilk). The bond strength values were evaluated by two way ANOVA with a split-plot design and Post hoc Tukey’s test (a = 0.05) using the SPSS 20 software (SAS, Cary, NC, USA). Results: The bond strength test revealed a higher bond strength value for the non – irradiated group compared to the irradiated group. Among the three sealers tested, BioRoot RCS showed the highest bond strength value followed by AH Plus and least by MTA Fillapex. BioRoot RCS showed least number of failures among the sealers tested. Conclusion: Bio Root RCS showed the maximum bond strength values with least failures irrespective of radiation, thus it can be considered the choice of sealer in patients undergoing radiotherapy. Clinical implications: It was known that therapeutic radiation affected the dentin ultrastructure and the bonding ability of sealer. In this study, BioRoot RCS showed better bond strength than AH Plus and MTA Fillapex which could be due to the type of bonding as well the elimination of EDTA from the irrigation protocol.