Development and practical application of low viscous dual cure impression material

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Light and chemical dual cured impression materials were experimentally made to cover the weak point of chemical cured silicon impression materials on the market.1. Set and the degree of cross-linking polymerization of the addition type silicon rubber impression materials adding CQ or QTX and changing the ratio of base and catalyst were tested. Polymerization reaction of these materials was delayed and it showed no sign of improvement in spite of increasing the irradiation time or adding metylmethacrylate, HEMA.2. Polymerization reaction did not occur in silicon acryl emulsion DK-7500 adding photo initiator, Hydrogen Hexachloroplatinate (IV) Hexahydrate and dibutyltin dilaulate.3. Polymerization of PGHDDT (polypropylene glycol, hexamethylene diisocianate, dibutyl tin dilaulate, 2-HEMA) was observed by the 60 seconds irradiation, but elastic properties of these experimental products were not sufficient.4. Silicon acryl emulsion DK-7500 was used instead of polypropylene glycol in PGHDDT. Polymerization reaction of this experimental product did not occur.5. PGIEDT (polypropylene glycol, isocianate ethylmethacrylate, dibutyl tin dilaulate) adding various ratio of CQ and MED, or another photoinitiator QTX was tested. The degree of polymerization reaction of these experimental products was not sufficient.6. Polyurethane impression materials of various ratio of polypropylene glycol 2000, Diphenylmethane diisocianate, methyl imidazole were made and tested. The degree of polymerization reaction and elasticity were not sufficient.Light cured materials were successfully made but the elasticity was still lacking. We have a plan to develop dual cure silicon impression materials possessing the elasticity, and test the working and setting time, elastic deformation, permanent deformation and detail reproduction in near future.