Photopolymerization of poly(melamine-co-formaldehyde) acrylate for dental restorative resins
✍ Scribed by Nie, Jun; Rabek, Jan F; Lindén, Lars-Åke
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 180 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
This paper describes the investigation of photoinitiated polymerization of poly(melamineco-formaldehyde) acrylate (PMFA) by camphorquinone (CQ) and amines (AMH) by visible light (k > 400 nm). It was shown that as the concentration of CQ and/or AMH increases, the rate of polymerization reaches a maximum and then decreases. The double bond conversion of PMFA was 20-35% , whereas monomer conversion was 90-96% , depending on the polymerization conditions. Addition of inorganic üller up to 70 wt% did not signiücantly inýuence the polymerization kinetics. The ünal hardness of the photocured samples (with 70 wt% üller) was about half that found in a commercial dental restorative composite. The shrinkage of a composite with 70 wt% üller was 2.12% . Dental formulations based on photocuring of PFMA can be considered for clinical applications, after biological and toxicological evaluation.