Abstract
Objective: To evaluate the compressive, diametral tensile, shear bond strength, and setting time of sol-gel formulated glass-ionomer cement (FGIC) (60%SiO2, 35%CaO, 5%P2O5) with and without incorporation of nano-fluorapatite (nano-FAp) in comparison with commercial glass-ionomer cement (CGIC).Material and methods: glass powder was prepared by sol-gel method and nano-FAp was added into the prepared glass powder with four different concentrations (1wt.%, 2wt.%, 3wt.%, and 4wt. %). A total number of 432 samples were used in this study. samples were grouped into six groups; group 1; CGIC (negative control), group 2; FGIC (positive control), group 3; FGIC/1wt.% Nano-FAp, group 4; FGIC/2wt.% Nano-FAp, group 5; FGIC/3wt.% Nano-FAp; and Group 6; FGIC/4wt.% Nano-FAp. Each group was subdivided into four subgroups of (18) samples each according to type of the test. The samples were characterized and mechanically tested for compressive, tensile, shear bond strength, and setting time. Rsults: Prepared GIC recorded the lower compressive, tensile ,and shear bond strength, and the higher setting time when compared to the commercial GIC. While, these results improved with the increases of the concentration of the added nano-FAp from 1wt. % to 3wt. % and then decrease again at 4wt. %. Conclusions: The preparation of GIC with sol-gel method has lower compressive , tensile, and shear bond strength, and longer setting time than GIC. However, the addition of 1-3 wt. % nano-FAp to the prepared GIC improve its mechanical properties and setting time. While the use of higher concentration than 3wt.% resulted in decrease in the tested properties.