1987 Fiscal Year Final Research Report Summary
A Study on Development of Expansible Composite Resins Containing Microspherical Filler with Improved Surface
| Project/Area Number |
60570907
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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 | JOSAI DENTAL UNIVERSITY |
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Principal Investigator |
ARAI Koichi 452290049396, 歯学部, 助教授 (90049396)
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| Project Period (FY) |
1985 – 1987
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| Keywords | Expansible monomer / Non-shrinking composite resin / Expansible composite resin / Bicyclic ortho ester / Ionic polymerization / Cationic polymerization / Radical polymerization / Microspherical inorganic filler / 微球状フィラー |
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| Research Abstract |
In this study, three kinds of expansible monomers,1-vinyl-4-ethy1-2,6,7-trioxabicyclo [2,2,2] octane, isophorone diisocyanate and trimethyl hexamethylene diisocyanate containing bicyclic ortho ester structure were synthesized, and various expansible composite resins, which had various expansible monomer/dilute monomer [triethylene glycol dimethacrylate or di (methacryloxy ethyl) trimethyl hexamethylene diurethane] ratio and trial microspherical filler with improved surface (75wt% const.) were prepared. The physical and mechanical properties of various expansible composite resins were examined, and the following results were obtained.
1. In the examination of mixing time, expansible composite resins tended to take a long time in proportion to increase additive volume of expansible monomer. 2. In the examination of curing time, expansible composite resins tended to behind time in proportion to increase additive volume of expansible monomer. 3. In the examinations of compressive and tensile strength, expansible composite resins tended to decrease in proportion to increase additive volume of expansible monomer. 4. Cationic catalyst, (C_2H_5)_2O・BF_3 which used this study, had a short life time and more late in rate of polymerization than radical catalyst benzoyl peroxide.
In the future, it is necessary that kinds and additive volume of expansible monomers, catalysts and accelerator are investigated,in order that expansible composite resins become practicable.
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