A study of spectral, mechanic and thermal properties of bulk fill resin dental composites

Bulk fill resin dental composites have excellent features as easy to dispense with minimal handling, improved physical and mechanical characteristics. In this thesis, thermal behaviors, spectral, surface, water sorption and microhardness properties of Surefill SDR, Xtra Base, Xtrafill and, Quixfill bulk fill resin dental composite polymerized by halogen light were studied by in vitro. It is determined that the degradation temperature, residue, glass transition temperature, particle size range, degree of conversion, microhardness and water sorption properties of the composites changed due to their different organic resin matrix, inorganic filler and interphase. Composites should have a high degree of conversion, low water sorption value, high microhardness number, low surface roughness, high glass transition temperature and best thermal stability for dental application. As a result, XB composite has the highest Tg value and degree of conversion. XF composite has the highest microhardness number. Also, all composites have similar and little amount of water sorption value. Consequently, the water sorption and solubility values of all materials are found clinically appropriate according to the ISO 4049 standards.