Polymerization shrinkage by investigation of uv curable dental restorative composites containing multifunctional methacrylates

Abstract

Typical commercial restorative dental compositions in the form of medical resins contain in-organic fi llers, multifunctional methacrylates and photoinitiators. The currently used resins for direct composite restoratives have been mainly based on acrylic chemistry to this day. The main problem with the application and radiation curing process is the shrinkage of photoreactive dental materials during and after UV curing. Shrinkage of restorative radiation curable dental composites is a phenomenon of polymerization shrinkage, typical behavior of multifunctional methacrylates during the polymerization process. The important factors in curing of dental composites are: the kind and concentration of the used methacrylate, its functionality, double bond concentration, the kind and concentration of the added photoinitiator and UV dose emitted by the UV-lamp. They are investigated multifunctional 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), triethylene glycol dimethacrylate (TEGDMA), trimethylolpropane trimethacrylate (TMPTMA), 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl) phenyl]propane (Bis-GMA), ethoxylated Bis-GMA (EBPDMA) and dodecandiol dimethacrylate (DDDMA). Reduction of polymerization shrinkage of restorative dental compositions is at the moment a major problem of dental technology. This problem can be solved through an application of photoreactive non-tacky multifunctional methacrylates in the investigated dental adhesive fi llings.

Effect of modulated photo‐activation on polymerization shrinkage behavior of dental restorative resin composites

“…Furthermore, unlike Esthet X flow, Rebilda DC contains dodecanediol dimethacrylate (DDDMA) in its resin matrix. This monomer has been shown to cause low shrinkage during polymerization as a result of the presence of a long organic spacer between two reactive end methacrylate groups .…”

Digital Light Processing‐3D Printing of Thermoset Materials with High Biodegradability from Amino Acid‐Derived Acrylamide Monomers

“…Moreover, this graphic indicates that the irradiation per layer should be in the range of 20 s. The values found for the shrinkage are in the usual range for common acrylates. [ 43 ] For comparison, the experiment was repeated using a gap of 400 µm, obtaining practically analogous time to start the reaction and proving that the shrinkage is not dependent on the sample gap used (Figure S7b, Supporting Information).…”

Synthesis of bio-sourced liquid resins and their photopolymerization with poly(ethylene glycol) diacrylate in the roadmap to more sustainable digital light processing technologies

“…In all cases, the copolymers maintained a reduced shrinkage behaviour after the complete irradiation (∼10-13%), which is in agreement with the usual range for common photopolymerizable polymers. 42,43 Furthermore, these results indicate that, in particular for the case of DAS, the irradiation time should not be lower than 400 s per 50 µm layer thickness to ensure the maximum compaction of the successive layers in the printer machine.…”