Segerström Susanna, Ruyter I Eystein
NIOM, Nordic Institute of Dental Materials, Haslum, Norway.
Dent Mater. 2009 Jul;25(7):845-51. doi: 10.1016/j.dental.2008.12.007. Epub 2009 Feb 20.
To determine flexural strength and modulus after water storage and thermal cycling of carbon-graphite fiber-reinforced (CGFR) polymers based on poly(methyl methacrylate) and a copolymer matrix, and to examine adhesion between fiber and matrix by scanning electron microscopy (SEM).
Solvent cleaned carbon-graphite (CG) braided tubes of fibers were treated with a sizing resin. The resin mixture of the matrix was reinforced with 24, 36, 47 and 58wt% (20, 29, 38 and 47vol.%) CG-fibers. After heat polymerization the specimens were kept for 90 days in water and thereafter hydrothermally cycled (12,000 cycles, 5/55 degrees C). Mechanical properties were evaluated by three-point bend testing. After thermal cycling, the adhesion between fibers and matrix was evaluated by SEM.
Hydrothermal cycling did not decrease flexural strength of the CGFR polymers with 24 and 36wt% fiber loadings; flexural strength values after thermocycling were 244.8 (+/-32.33)MPa for 24wt% and 441.3 (+/-68.96)MPa for 36wt%. Flexural strength values after thermal cycling were not further increased after increasing the fiber load to 47 (459.2 (+/-45.32)MPa) and 58wt% (310.4 (+/-52.79)MPa). SEM revealed good adhesion between fibers and matrix for all fiber loadings examined.
The combination of the fiber treatment and resin matrix described resulted in good adhesion between CG-fibers and matrix. The flexural values for fiber loadings up to 36wt% appear promising for prosthodontic applications such as implant-retained prostheses.
测定基于聚甲基丙烯酸甲酯和共聚物基体的碳石墨纤维增强（CGFR）聚合物在水储存和热循环后的弯曲强度和模量，并通过扫描电子显微镜（SEM）检查纤维与基体之间的粘附力。
用浸润树脂处理经溶剂清洁的碳石墨（CG）编织纤维管。基体的树脂混合物用24、36、47和58wt%（20、29、38和47vol.%）的CG纤维增强。热聚合后，将试样在水中保存90天，然后进行热循环（12000次循环，5/55摄氏度）。通过三点弯曲试验评估力学性能。热循环后，通过SEM评估纤维与基体之间的粘附力。
对于纤维含量为24%和36wt%的CGFR聚合物，热循环并未降低其弯曲强度；热循环后的弯曲强度值，24wt%的为244.8（±32.33）MPa，36wt%的为441.3（±68.96）MPa。将纤维含量增加到47%（459.2（±45.32）MPa）和58wt%（310.4（±52.79）MPa）后，热循环后的弯曲强度值并未进一步提高。SEM显示，在所检查的所有纤维含量下，纤维与基体之间均具有良好的粘附力。
所述的纤维处理和树脂基体的组合导致CG纤维与基体之间具有良好的粘附力。对于高达36wt%的纤维含量，其弯曲值对于诸如种植体固位修复体等口腔修复应用似乎很有前景。
