Abstract
INTRODUCTION: The aim of adding chlorhexidine (CHX) to glass ionomer cements (GIC) is to improve their antibacterial property, but it may interfere with their bond to dentin. OBJECTIVE: To evaluate the influence of adding chlorhexidine diacetate at different concentrations to a high-viscosity GIC on its bond to sound and artificial caries-affected dentin. MATERIAL AND METHOD: Eighty human third molars were used, on which an area of dentin was exposed on the occlusal surface. Half of the specimens were kept sound and the other half were subjected to artificially induced caries. CHX was mixed with GIC powder at 0.5%, 1% and 2% (w/w). GIC without CHX was used as control. On each dentin surface a specimen measuring 1 mm in diameter and 1 mm high was made. The samples were kept at 37 °C and 100% humidity for 24 hours and subject to microshear testing. The results were analyzed using Kruskal-Wallis and Mann Whitney tests (α=0.05). RESULT: There was no significant difference between bond strength of sound and caries-affected dentin (p>0.05). For both substrate conditions, groups GIC, GIC+0.5% CHX and GIC+1% CHX showed statistically similar bond strength (p>0.05), and higher than that of GIC+2% CHX (p<0.025). Cohesive and mixed failures were predominant in all groups. CONCLUSION: The addition of 0.5% and 1% chlorhexidine did not result in negative changes in the bond strength of GIC to caries-affected and sound dentin.
Highlights
The aim of adding chlorhexidine (CHX) to glass ionomer cements (GIC) is to improve their antibacterial property, but it may interfere with their bond to dentin
As studies of the bond strength of GIC associated with chlorhexidine are scarce[12] and there are no studies testing this property in caries-affected dentin, the aim of this study was to evaluate the influence of the addition of different concentrations of CHX diacetate, on the bond strength of a high viscosity GIC to sound and caries‐affected dentin
Previous studies have shown that the values of shear bond strength of GICs to sound dentin are low, generally between 1 and 3 MPa and they rarely exceed 5 MPa20-22
Summary
The aim of adding chlorhexidine (CHX) to glass ionomer cements (GIC) is to improve their antibacterial property, but it may interfere with their bond to dentin. Result: There was no significant difference between bond strength of sound and caries-affected dentin (p>0.05). Conclusion: The addition of 0.5% and 1% chlorhexidine did not result in negative changes in the bond strength of GIC to caries-affected and sound dentin. The low mechanical strength of the conventional formulations of this material[5] is a limiting factor for its use in cavities subjected to high masticatory stresses, such as extensive Class I and Class II restorations. This has led to the development of a new category of GICs with enhanced physical properties. The effects of this lower fluoride ion release on the inhibition of residual caries lesions are not yet known, various researchers[10,11,12,13,14] have proposed the association of anti-septic agents with GICs, in order to improve their antibacterial properties
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