Saturday, February 19, 2011

The incorporation of casein phosphopeptide–amorphous calcium phosphate into a glass ionomer cement

Here is an interesting study on reminerilzation and reduction of caries.This may have significant future implications for MID.  MJ

Dental Materials Volume 27, Issue 3, Pages 235-243 (March 2011)
Hanan Al Zraikata, Joseph E.A. PalamarabCorresponding Author Informationemail address, Harold H. Messerb, Michael F. Burrowb, Eric C. Reynoldsb

Abstract 

Objectives
The aim of this study was to measure the effect of incorporating CPP–ACP into an autocure GIC on physical and mechanical properties, ion release and enamel demineralization inhibition.
Methods
Physical and mechanical properties were evaluated using tests specified by the International Organization for Standardization (ISO). Concentrations of fluoride, calcium and inorganic phosphate in deionized water (pH 6.9) and lactic acid (pH 4.8) were measured up to five months. Cavities on human extracted molars were prepared, restored with GIC (control), CPP–ACP modified GIC or resin composite, then stored in 50mM lactic acid solution at pH 4.8 for 4 days. Sections of demineralized enamel were examined using polarized light microscopy followed by lesion area measurement.
Results
The incorporation of up to 5% CPP–ACP into Fuji VII decreased the cements’ strength and prolonged setting time. However, values remained within ISO limits. The incorporation of 3 or 5% CPP–ACP significantly decreased fluoride release, while higher calcium and inorganic phosphate release occurred. The demineralized enamel area adjacent to GIC with 3 or 5% CPP–ACP was significantly smaller compared to GIC control.
Significance
The incorporation of 3% CPP–ACP into GIC has the potential to improve its anticariogenic ability without adversely affecting its mechanical properties.

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