Effect of Nanoparticles Modified Glass Ionomer Cement on the Colour and Shear Bond Strength of Lithium Disilicate Ceramic

Abstract

The effect of glass ionomer cement modified by nanoparticles on the bond strength and colour of lithium disilicate ceramic was studied. Glass ionomer cement modified by nanosilver or nanogold, glass ionomer cement and IPS e.max CAD A2 were used. Thirty e.max CAD discs were constructed. The samples were divided into 3 groups, the first group, 10 samples (control group) used non modified glass ionomer cement (GIC), the second and third groups, 10 samples each used modified glass ionomer cement : nano silver (NSGIC), nanogold (NGGIC). The samples were then subdivided according to the test to which they will be subjected: colour test-shear bond strength test (5 samples each).The samples subjected to colour test were cemented to a composite discs with a shade A2 while those subjected to shear bond strength test were cemented to dentine, using the 3 tested types of glass ionomer. Results showed that ΔE of all the tested samples recorded values in the range of clinical acceptability. NGGIC group showed less ΔE than NSGIC group compared to the control group. Also, the results showed no statistical significant difference in shear bond strength between the control group (GIC) and the two experimental groups (NSGIC) and (NGGIC). Conclusion: The addition of nanoparticles to glass ionomer cement resulted in ΔE within the clinical acceptance. Also, they showed no significant difference as regards to shear bond strength.

Evaluation of the effect of nano‐graphene oxide on shear bond strength of conventional and resin‐modified glass ionomer cement

“…Nevertheless, we used 10% polyacrylic acid to condition the dentin, which causes the partial removal of the smear layer and the demineralization of the upper surface dentin, thereby enabling the establishment of micromechanical adhesion and the formation of a shallow hybrid layer, which leads to the improvement of the bond strength (Nicholson, 2016 ). It is also worth noting that we used the SBS test because chewing forces around the mouth are a combination of compressive, tensile, and shear that are applied to the restorative material and tooth tissue, but most of them include shear forces (Salem & Asaad, 2019 ). It can be predicted that if micro‐tests are used instead of macro, much higher bond strength values are obtained (Ismail et al, 2021 ).…”

Estimation of some properties of Glass Ionomer Luting Cement reinforced with Zirconium oxide Nanoparticles

“…Evaluation of the shear bond strength is significant specially when dealing with considerably brittle materials like GICs (33) .In the present study, the obtained results showed a slight but statistically insignificant increase in the value of shear bond strength with increasing concentration of ZrO 2 NPs and this agree with previous study done by Rezvani (33) and Garcia -contreras et al (34) , who explained that addition of nanoparticles to GIC cement basic powder, does not influence the shear bond strength, this could be explained by the presence of low attraction ionic force between additive particles and luting cement base powder, And this could be due to the fact that the nanoparticles may act as an inert particle forming obstacles that enhance crack formation, Nanosized particles can occupy and fill the empty gaps and spaces between the larger sized glassionomer powder particles (35) and provide extra site for bonding with the polymer matrix (36) or the added nano-size particle allows their dispersion without any significant geometric matrix change between and around polymer chains of the cement.…”

Shear Bond Strength Assessment of Vita Suprinity Ceramic to Enamel and Dentine Using Three Different Resin Cements

“…A lot of factors affect the durability of the restoration as; structure of tooth surface, preparation and design, the used ceramic type, the type of cement used, tooth morphology and functional and parafunctional activities of the patient (5) .…”