The purpose of this study was to evaluate the effect of the amount of 3-Met[acryloxypropyl- trimethoxysilane (T-MPS) coupling agent on some properties of an experimental resin composite for understanding the optimum arnount of silanization\" Apatite glass ceramic nano-particles which were synthesized in our laboratory by specific rnicrostructures, used as filler. Moreover the flour release of these components prohibits the dental decay\' Flour apatite powders were treated with y-MpS using standard techniques in both polar and non polar systems. Fourier Transform spectroscopic Infraed (Frlny results showed that the optimum amount of silane is about 2-4vo silane. Series of experimental composites consisting of Biphonel\'a-glysidyl methacrylate (BisGMA) based resin and treated flour apatite filler were produced. In order to study the progress of polymerization process, F-IIR test was employed. Since the presence of water leads to the degradation of silane bonds, in order to simulate the oral condition mentioned composites were stored in water for specific tirnes and temperatures. In the next step in order to investigate the bonding changes, FTIR test was used\' The micro hardness test showed that the maximum hardness value about 350-450 vHN\" based on FTIR and micro hardness results, the non polar system showed more suitable properties; more mechanical analysis including Diametral Tensile Strength (DTS) and flexural strength tests were employed. The results of flexural test showed the value around g0-90 MFa

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