試作並びに市販支台築造用コンポジットレジンの機械的性質に関する基礎的研究

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Composite resins have progressively been used in dental practice for building crown abutments. For the restorative use as the filling material they have a longer history than for the abutment, and their properties required for the fommer (such as abrasion) have been investigated fairly well. But the investigation on the properties required for the latter (such as impact strength) seem to be few. So the mechanical properties of the experimental composite core resins were investigated and compared with those of commercial composite core resins. The experimental composite core resins were prepared with the following ingredients : Bis-phenol A diglycidilmethacrylate (as matrix), ethyleneglycol dimethacrylate (as diluent), benzoyl peroxide (as catalyst), N, N-dimethyl paratoluidine (as accelerator), quartz glass (as filler) and trichlorovinylsilane (as coupling agent of filler). The filler content was always between 60 to 70 wt% to the sum of the base and the diluent. Three different particle sizes were adopted for the filler. Specimens were examined on their impact strength, compressive strength, elastic modulus (in compression) and hardness (KHN) under the condition close to the clinical. Impact strength increased by making the filler size smaller and the filler amount lesser, within a certain limit, respectively. And the specimen prepared with Bis-GMA (50 mol%) as the base and tetra-EDMA (50 mol%) as the diluent, surface treated quartz glass powder (60 wt% to the sum of the base and the diluent) as the filler showed the highest impact strength (1.48 kgf・cm/cm^2). This value was about the same as that of commercial resins. Compressive strength, elastic modulus (in compression) and Knoop hardness number increased by making the filler amount greater within a certain limit. Compressive strength and Knoop hardness increased by making the filler size smaller within a certain limit. Elastic modulus (in compression) was not influenced by the filler size. And the specimen prepared with Bis-GMA (20 mol%) as the base and EDMA (80 mol%) as the diluent, surface treated quartz glass powder (70 wt% to the sum of the base and the diluent) as the filler showed the highest compressive strength (2811 kg/cm^2), elastic modulus (in compression) (2.99×10^<11>dyn/cm^2) and Knoop hardness number (63.7).
九州歯科学会の論文
1980-01-25

試作並びに市販支台築造用コンポジットレジンの機械的性質に関する基礎的研究

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