Thermal behavior of direct resin composites: glass transition temperature and initial degradation analyses

Thermal, spectral, and surface properties of LED light-polymerized bulk fill resin composites

“…The heat of cure of resin cements was 33.9-58.7 J/g using a chemical cure without light exposure and 37.5-60.1 J/g using a light cure [26]. The high content of inorganic filler corresponded with the residual amounts of the composites [41]. The manufacturer reported organic contents of 68 wt% for SDR, 75 wt% for XB, 86 wt% for XF, and 85.5 wt% for QF, which agrees with our experimental results.…”

“…Results acquired using this method enable determination of the T g values of LED-polymerized resin composites. Above the T g , the DC can increase once the monomers are given further opportunity to react [11,41,44]. Rojas et al [38] studies the thermal and structural properties of different commercial dental resins -Filtek™ Z-350, Grandio, Tetric Ceram, and TPH Spectrum -cured by blue LEDs.…”

“…The DSC results showed that Tetric Ceram dental resin presented the highest T g values and that dental resin displays the best stability when compared with the other commercial resins. Santana et al [41] investigated the T g and initial degradation temperatures of five commercial direct resin composites (FillMagic, Glacier, Te-Econom, Prisma APH, and Natural Look) using DSC and TGA. Look.…”

“…The type, Brought to you by | Stockholms Universitet Authenticated Download Date | 7/6/15 10:23 PM amount, particle size, and distribution of the fillers influence DC. Light may be scattered between matrix and particle interfaces and absorbed by both, which results in a continuous decrease in light intensity during the cure reaction in dental resin composites [41]. The larger filler size and lower filler concentration (68 wt%) in SDR resulted in almost the same curing rate as QF, which has a smaller filler size and higher filler concentration (85.5%).…”

“…Although some thermal analysis studies of RBCs have been conducted [15,26,33,38,41], there is little information about bulk fill composites that includes micromechanical properties such as indentation modulus [7,10,20], Vickers hardness [10,20], and macromechanical properties (flexural strength and flexural modulus) [10,16,18,20,27], creep deformation [14], bulk compressive creep [13], determination of the hardness and elastic modulus of resin composites by nanoindentation [12], depth of cure [2,17], shrinkage behavior [21], effect of bulk-filling high-C-factor posterior cavities on adhesion to cavity bottom dentin [46], effects of bulk fills on cell viability, cellular damage, and expression of mesenchymal markers on dental stem cells [37], marginal adaptation [8], and curing behavior [22].…”