Influence of Various Irradiation Processes on the Mechanical Properties and Polymerisation Kinetics of Bulk-Fill Resin Based Composites

摘要: Abstract Objectives To assess the effect of irradiation time and distance light tip on micro-mechanical properties polymerisation kinetics two bulk-fill resin-based composites at simulated clinically relevant filling depth. Methods Micro-mechanical (Vickers hardness (HV), depth cure (DOC) indentation modulus ( E )) (real-time increase degree (DC)) (Tetric EvoCeram ® Bulk Fill, Ivoclar Vivadent x-tra base, Voco) were assessed varying (0.1–6 mm in 100 μm steps for HV 0.1, 2, 4 6 mm DC), (10, 20 or 40 s, Elipar Freelight2) distances from (0 7 mm). Curing unit's irradiance was monitored 1 mm up to 10 mm away a laboratory-grade spectrometer. Results Multivariate analysis α  = 0.05), Student's t -test Pearson correlation considered. The influence material measured mechanical significant η 2  = 0.080 0.256 HV), while parameters , emphasise stronger Tetric Fill. could be described by an exponential sum function, distinguishing between gel glass phase. above mentioned strongly influenced start (gel phase), less importance Conclusions Both materials enable least 4 mm thick increments cured one step under curing conditions. Clinical significance susceptibility variation dependent, thus conditions might vary different extent those ideal