THE STUDY OF CORRELATION BETWEEN COMPRESSIVE STRENGTH AND FLUORIDE RELEASE OF FLUORIDE CONTAINING DENTAL CEMENTS
Keywords:
Dental cement, Compressive strength, Fluoride releaseAbstract
Objective: To evaluate compressive strength (CS) and ability to release fluoride (CumF) of dental cements containing fluoride. The correlation between compressive strength and fluoride release in 24 h also is studied.
Materials and Methods: Fluoride containing dental cement used in this study are Zinc Phosphate cement (ZnP), Polycarboxylate cement (ZnPoly), Conventional glass ionomer cement (GIC) and Resin-modified glass ionomer cement (RMGIC). CS was evaluated following International Standard Organization (ISO 9917-1:2007) by universal testing machine (LLOYD instrument, England). Cumulative fluoride ions (CumF) were determined by Fluoride Ion Selective Electrode (F-ISE) (HI-4110 electrode and HI-5222-02 meter, HANNA instruments, UK). Data analysis were performed by using one-way ANOVA, Scheffe's Method (p<0.05) and correlation between the two properties.
Results: The average compressive strength of cement is between 45-165 MPa and the average of fluoride release in 24 hours is between 2.3-7.9 ppm. From the statistical analysis found that the GIC with improving of glass hybrid had the highest compressive strength (165 MPa) while the fluoride release at 24 h of RMGIC was significantly lower than all cement groups (p=0.00). The fluoride release at 24 h of GIC was significantly higher than all cement groups (p=0.00). A negative linear correlation was found between the compressive strength and fluoride release (r = -0.698).
Conclusions: CS of fluoride containing cements had an inversely variation to the fluoride releasing.
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