Antimicrobial Potency and Bond Strength of Glass Ionomer Cement Following Cavity Disinfection with Er, Cr: YSGG Laser, and Iron Oxide Nanoparticles in Deciduous Molars
DOI:
https://doi.org/10.12669/pjms.42.7.15717Keywords:
Caries-affected dentin, SEM, Disinfection, NanoparticlesAbstract
Objectives: To find out the effect of dentin surface disinfectants (Chlorhexidine (CHX), Er, Cr: YSGG laser (ECYL), and Iron oxide nanoparticles (Fe₃O₄NPs) on the inhibition of Streptococcus mutans (S.mutans) and the shear bond strength (SBS) of glass ionomer cement (GIC) to the caries-affected dentin (CAD) of primary molars.
Methodology: The present in vitro trial was approved by King Khalid University. The study was completed in four months, August 15, 2025 to December 15, 2025. Forty mandibular primary second molar teeth exhibiting a score of four as per the International Caries Detection and Assessment System (ICDAS) were obtained. The criteria employed to procure CAD included visual inspection, evaluation of surface hardness, and staining. Subsequently, the teeth were distributed into four cohorts (n=10) based on different methods of disinfection. Group-1: No disinfection, Group-2: CHX, Group-3: ECYL, and Group-4: Fe₃O₄NPs. The agar diffusion test was employed to evaluate the antibacterial efficacy of the tested agents against S. mutans. GIC restoration was built up on the samples and artificially aged. The assessment of SBS and fracture patterns was conducted utilizing a universal testing apparatus and a stereomicroscope, respectively. The parametric One-Way ANOVA alongside Tukey’s post hoc tests were employed to enable comparisons among the tested groups, p < 0.05.
Results: The widest zone of inhibition was presented by Group-2 (CHX) (15.95±1.54 mm). The narrowest zone was displayed by Group-1 (No disinfection) (6.24±1.13 mm). Group-3 ECYL (7.33±0.34 MPa) presented the highest bond SBS. Group-4 (Fe₃O₄NPs) exhibited the lowest bond strength (4.02±0.25 MPa).
Conclusion: Er, Cr: YSGG laser demonstrated satisfactory antimicrobial potency and shear bond strength when used as a cavity sterilant on caries-affected dentin of primary molars.
