Canal disinfectants: Potassium titanyl phosphate laser, magnesium oxide nanoparticles, and aloe-emodin PDT on smear layer removal and bond strength of glass fiber post to root dentin

Abstract

AIM

To assess the influence of different root canal disinfectants i.e., Potassium titanyl phosphate laser (KTPL), Aloe-emodin (AE) mediated Photodynamic therapy (PDT), Magnesium oxide (MgO) nanoparticles (NPs) on smear layer (SL) removal and push out bond strength (PBS) of Glass fiber post (GFP) to the canal dentin.

MATERIAL AND METHOD

Forty-eight extracted premolars, having a single root and a solitary canal were included. A root canal procedure was performed on each tooth and subsequently, post-space preparation was executed using peeso-reamers leaving approximately 4 mm of gutta percha in the canal. According to the type of disinfection used the samples were categorized into 4 groups (n = 11). Group 1 (2.5 % NaOCl + EDTA), Group 2 (KTPL+ EDTA), Group 3 (AE mediated PDT+ EDTA), and Group 4 (MgONPs+ EDTA). Cementation of fiber posts was performed using a self-adhesive resin cement. Scanning electron microscope (SEM) assessed the SL removal from the canals (n = 2). Failure mode and PBS were assessed with a stereomicroscope and universal testing machine respectively(n = 10). One-way analysis of variance and Tukey posthoc test at p-value  ≤ 0.05 were used to compare the mean scores of PBS and SL removal.

RESULT

The cervical region in Group 4 (MgONPs + EDTA) samples showed the highest PBS scores (10.41±0.38 MPa) and the maximum level of SL removal (1.55±0.10). Conversely, Group 3 at the apical third of the root (AE mediated PDT ₊EDTA) displayed the least efficacy for SL removal (2.81±0.09) and lowest PBS(7.69±0.19 MPa).

CONCLUSION

MgO nanoparticles, when paired with Ethylenediaminetetraacetic acid as a final irrigant, offer a promising alternative to conventional root canal sterilants.