Abstract
INTRODUCTION:For presenting wide antibacterial activity, chlorhexidine (CHX) has been extensively used in dentistry and can be easily incorporated into the glass ionomer cement (GIC) and consequently released into the oral cavity.AIM: The aim of this study was porosity and compression strength of a GIC, that was added to different concentrations of CHX.MATERIAL AND METHOD: Specimens were prepared with GIC (Ketac Molar Esaymix) and divided into 4 groups according to the concentration of CHX: control, 0.5% and 1% and 2% (n = 10). For analysis of pores specimens were fractured with the aid of hammer and chisel surgical, so that the fracture was performed in the center of the specimens, dividing it in half and images were obtained from a scanning electron microscope (SEM) analyzed in Image J software. The compressive strength test was conducted in a mechanical testing machine (EMIC - Equipment and Testing Systems Ltd., Joseph of the Pines, PR, Brazil). Statistical analysis was performed by ANOVA, Tukey test. Significance level of 5%.RESULT: No statistically significant changes between the study groups was observed both for the number of pores as well as for the compressive strength.CONCLUSION: The use of GIC associated with CHX gluconate 1% and 2% is the best option to be used in dental practice.
Highlights
For presenting wide antibacterial activity, chlorhexidine (CHX) has been extensively used in dentistry and can be incorporated into the glass ionomer cement (GIC) and released into the oral cavity
Prior to evaluation of the porosity, the samples were stored in an oven for 1 hour at 37oC and 90% relative humidity, fractured aided surgical chisel and hammer, so that the fracture was performed in percent of the test body, dividing it in half and submitted to scanning electron microscopy (SEM)
According to Jedrychowski et al.[7 ], CHX digluconate increases the antibacterial activity when added to GIC, since it diffuses more rapidly than the cement as the latter is in powder form (CHX diacetate)
Summary
Glass ionomer cements (GICs) have the potential of preventing caries disease and possess important properties, such as biocompatibility, chemical adhesiveness to dental structures, fluoride-releasing capacity, reabsorption of fluoride from oral environmen[1,2,3]. Adding CHX to GIC can result in changes in the material’s mechanical properties because its micro-structure is affected[5] Factors such as integrity of the interface between glass particles and polymeric matrix, size of the particles, amount and size of the pores in the material all play an important role in determining the mechanical properties[7,10] such as compressive strength[10]. The hypothesis to be tested is that the addition of different concentrations of CLX not promote changes in the number and size of pores, as well as the strength of compression resistance
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