A physico-chemical explanation of the post-polymerization shrinkage in dental resins
Truffier-Boutry, D × Demoustier-Champagne, S Devaux, Jacques Biebuyck, JJ Mestdagh, M Larbanois, P Leloup, G #
Elsevier sci ltd
Dental materials vol:22 issue:5 pages:405-412
The main problem of a methacrytated dental resin's photopolymerization is the shrinkage phenomenon. This occurs, as expected, during light irradiation but also, unexpectedly, during about 24 h after photopolymerization (i.e. during the so-called 'post-polymerization' stage). During this period, the conversion degree does not change significantly (no more initiation, very limited, if any, propagation reaction) but free radicals concentration decreases.