bis-GMA modified oligomers synthesis and their influence upon the dental-use diacrylic composites properties

In the present work, a mixture of oligomers called (modified bis-GWA)(0-2) has been synthesized using the mixture of three components bis-GMA(0-2) hav ing 83 mol % bis-GMA(0) nionomer- 2,2-bis[4-(2-hydroxy-3-methacryloyloxypro poxy) phenyl]-propane-, 16 mol % bis-GMA(1) dimer, 1 mol % bis-GMA(2) and m ethacryl chloride. The (modified bis-GMA)(0-2) oligomers mixture, bis-GMA(0 -2) and triethyleneglicol dimethacrylate have been used to formulate some e xperimental self cured arid light cured dental composites. The paper studie s the influences of the (modified bis-GMA)(0-2) oligomers upon the gel time , polymerization shrinkage, compressive strength, tensile strength, and wat er sorption of the cured experimental composites. We came to the conclusion that the composites originated from the synthesized (modified bis-GMA)(0-2 ) oligomers mixture have higher gel times and polymerization shrinkage than the composites originated from bis-GMA(0-2) oligomers. The strength proper ties were higher and water sorption values were lower for the (modified bis -GMA)(0-2)-based composites, proving the utility, of using the (modified bi s-GMA)(0-2) oligomers as comonomer in the monomer mixtures of dental diacry lic composites.