DOI: 10.4103/jcde.jcde_347_26 ISSN: 2950-4716

Microtensile bond strength of high-viscosity glass ionomer cements and nanoceramic composite to normal and caries-affected dentin: An in vitro study

Amireddi Venkata Siva Durga Prasad, Ravikumar Konagala, Jyothi Mandava, Gembali Sandeep Kumar, Sowmya Muduganti, Vedamani Chandolu
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Abstract

Background:

Modern caries management involves the removal of the carious dentin after selective removal of soft dentin while retaining the firm dentin and restoring with an appropriate restorative.

Aim:

To evaluate and compare the microtensile bond strength (μTBS) of high-viscosity GC Glass Hybrid and Glass Ionomer FX Ultra cements with Ceram.x nanoceramic composite on normal dentin (ND) and artificially induced caries-affected dentin.

Materials and Methods:

After collecting 90 extracted human mandibular molar teeth, the occlusal enamel was removed. Vestibulolingually teeth were sectioned into two halves, in which the distal half samples ( n = 90) were subjected to pH cycling. Both mesial ND and distal artificial carious dentin (ACD) tooth halves were assigned to three groups ( n = 15 each) depending on the restorative material tested. After undergoing thermomechanical cycling, dentin–restorative beams were subjected to μTBS testing, and the fracture type was analyzed under a scanning electron microscope. The bond strength data were assessed with one-way ANOVA and Tukey’s multiple post hoc test by establishing α =0.05 significance.

Results:

The mean μTBS of Ceram.x composite for both ND and ACD was significantly higher when compared to both high-viscosity glass ionomer cements (GICs) examined ( P = 0.0001). The μTBS of GC Hybrid and FX Ultra Tested were not different from each other in both the substrates ( P = 0.6518 in ND and P = 0.9603 in ACD). Nanocomposite exhibited more adhesive failures, whereas the tested GICs showed a cohesive mode of failures.

Conclusion:

Caries-simulated dentin has substantially lower μTBS values than ND. The μTBS values of the two tested GICs were much lower than the mean bond strength of the nanocomposite.

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