Kinetic studies of a new photoinitiator hybrid system based on camphorquinone-N-phenylglicyne derivatives for laser polymerization of dental restorative and stereolithographic (3D) formulations

The new photoinitiating system based on camphorquinone-N-phenylglycine and its derivatives is proposed for replacing widely used photoinitiator camphorquinone-amines for photocuring of polymeric dental formulations. The most important advantage of this new system is that these amino acids should be biologically less harmful than amines. However, it is hard to differentiate between the two for dental purposes without detailed studies. The kinetics of photoinitiated polymerization shows that the electron-proton transfer occurs via formation 'collision' and 'excited charge-transfer complexes', and can be described either by the classical Marcus equation or by the reactivity of free radicals formed. This new photoinitiating system can also be used for the photocuring of stereolithographic (3D) formulations. Copyright (C) 1996 Elsevier Science Ltd.