CHEMICAL CATALYST
Polymerization of resin requires initiation by a free radical. Initiation starts propagation or continued joining of molecules at double bonds until termination is reached. Chemical activation of peroxides produces free radicals. Chemical accelerators are often not color stable and have been improved for this reason.
The term self cure or dual cure (when combined with photo chemical initiation) describes chemical cure materials. Chemical composites mix a base paste and a catalyst paste for self cure. Bonding agents mix two liquids. Mixing two pastes incorporates air into the composite. Oxygen inhibits curing resulting in a weaker restoration.
Chemical accelerators include:
Dimethyl p-toludine
N,N-bis(hydroxy-lower-alkyl)-3,5-xylidine
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