1991 Fiscal Year Final Research Report Summary
Development of Non-Shrinkage Composite Resins : Expansible Monomers for Radical Polymerization
| Project/Area Number |
01571071
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Meikai University |
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Principal Investigator |
ARAI Koichi Meikai University, Dept. of Dental Materials Science, Associate Professor, 歯学部, 助教授 (90049396)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Expansible monomers / Bicyclic ortho ester / Non-shrinkage composite resins / Radical polymerization / Microspherical inorganic filler / Filler with improved surface |
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| Research Abstract |
In this study, two kinds of expansible monomers, isophorone and trimethyl hexamethylene diisocyanate containing bicyclic ortho ester structures were synthesized, and various expansible composite resins, which had each expansible monomer/dilute monomers (triethylene glycol dimethacrylate and two mixtures (isophorone diisocyanate or trimethyl hexamethylene diisocyanate : hydroxyethyl methaerylate=2 : 1) ratio and trial microspherical filler with improved surface (75wt%) were prepared. The physical properties of various expansible composite resins were examined, and the following results were obtained.
1. In cases of two radical catalysts, tert-butyl peroxy maleic acid・N, N-dihydroxy ethyl-p-toluidine F1-cyclohexyl-5-ethyl barbituric acid-4-acryloxy ethyl trimellitic acid system (BMA catalyst) and benzoyl peroxide-N, N-dihydroxy ethyl-p-toluidine・1-benzyl-5-phenyl barbituric acid・4-acryloxy ethyl trimellitic acid anhydride system (BPO catalyst), setting time of expansible composite resins were tended to behind time and to decrease compressive and tensile strength in proportion to increase additive volume (more than 20wt%) of expansible monomer respectively. Therefore, their composite resins had not been become practicable.
2. In case of BMA catalyst, composite resins with two expansible monomers (range from 5 to 20 wt%) were tended to behind time and to decrease compressive and tensile strength. However, in case of BPO catalyst, their composite resins had been same setting time and maximum values of compressive and tensile strength of composite resins with expansible monomers (5 or 10 wt%) respectively.
In the future, it is necessary that new kinds and additive volume of expansible monomers, catalysts and accelerator are investigated, in order that expansible composite resins become practicable.
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