Restor Dent Endod.  2021 May;46(2):e22. 10.5395/rde.2021.46.e22.

Effects of radiation therapy on the dislocation resistance of root canal sealers applied to dentin and the sealer-dentin interface: a pilot study

• Yaduka P
• Kataki R
• Roy D
• Das L
• Goswami S

• KMID: 2548066
• DOI: http://doi.org/10.5395/rde.2021.46.e22

Abstract

Objectives
This study evaluated and compared the effects of radiation therapy on the dislocation resistance of AH Plus and BioRoot RCS applied to dentin and the sealer-dentin interface.
Materials and Methods
Thirty single-rooted teeth were randomly assigned to 2 groups (n = 15 each): AH Plus (Dentsply DeTrey) and BioRoot RCS (Septodont). Each group was subdivided into control and experimental groups. The experimental group was subjected to a total radiation dose of 60 Gy. The root canals of all samples were cleaned, shaped, and obturated using the single-cone technique. Dentin slices (1 mm) were sectioned from each root third for the push-out test and scanning electron microscopy (SEM) was done to examine the sealer-dentin interface. The failure mode was determined using stereomicroscopy. Bond strength data were analyzed by the independent t-test, 1-way analysis of variance, and the Tukey post hoc test (α = 0.05).
Results
Significantly lower bond strength was observed in irradiated teeth than nonirradiated teeth in the AH Plus group (p < 0.05). The BioRoot RCS group showed no significant reduction in bond strength after irradiation (p > 0.05) and showed a higher post-irradiation bond strength (209.92 ± 172.26 MPa) than the AH Plus group. SEM revealed slightly larger gap-containing regions in irradiated specimens from both groups.
Conclusions
The dislocation resistance of BioRoot RCS was not significantly changed by irradiation and was higher than that of AH Plus. BioRoot RCS may be the sealer of choice for root canal treatment in patients undergoing radiation therapy.

Keyword

Bond strength; Dislocation resistance; Radiation therapy; Root canal sealers; Sealer penetration; Therapeutic radiation

Figure

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  Figure 1 Arrangement of samples in the water phantom with distilled water (front and side view).

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  Figure 2 Arrangement of the water phantom with samples on the right and left side of the linear accelerator machine in order to receive bilateral radiation.

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  Figure 3 Bar chart showing the mean bond strength (MPa) of the 2 sealer groups at the coronal, middle, and apical levels in the non-irradiated and irradiated samples.

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  Figure 4 Failure mode analysis using a stereomicroscope at ×40 magnification. (A and B) represent images of control group. (C and D) represent images of experimental group.

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  Figure 5 Qualitative analysis of the sealer-dentin interface by field-emission scanning electron microscopy (Gemini 300) at ×3,000 magnification. (A and B) represent images of the control group. (C and D) show larger gaps at the interface after irradiation (experimental group).D, dentin; F, filling.

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