Yoshida K, Matsumura H, Tanaka T, Atsuta M
Shika Zairyo Kikai. 1989 Sep;8(5):629-35.
Titanium dioxide-polymethacrylate composites were prepared with triethyleneglycol dimethacrylate (TEGDMA), 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimeth ylexane (UDMA) and rutile structure titanium dioxide. The coupling agents used were isopropyldimethacrylisostearoyl titanate (KR7), isopropyltri (dioctylphosphate) titanate (KR12) and 4-methacryloxyethyl trimellitate anhydride (4-META). Compressive and transverse strengths of composites were determined under various experimental conditions. Compressive strength of composite with KR 7-treated titanium dioxide was higher than that with untreated titanium dioxide. Transverse strength of the composite with 4-META-treated titanium dioxide was higher than that with untreated titanium dioxide. Both compressive and transverse strengths increased when the titanium dioxide was treated with the mixture of KR7 and 4-META. Scanning electron microscopic observations of fractured composite surfaces showed titanium dioxide polymer interface failure with untreated specimens and polymer cohesive fracture with KR7 + 4-META-treated specimens. The results suggest that titanium dioxide treated with both KR7 and 4-META is useful as a pigment of the opaque material of fixed prosthodontic composite.
采用二缩三乙二醇二甲基丙烯酸酯（TEGDMA）、1,6 - 双（甲基丙烯酰氧基 - 2 - 乙氧基羰基氨基）- 2,4,4 - 三甲基己烷（UDMA）和金红石结构的二氧化钛制备了二氧化钛 - 聚甲基丙烯酸酯复合材料。使用的偶联剂为异丙基二甲基丙烯酰异硬脂酰钛酸酯（KR7）、异丙基三（二辛基磷酸酯）钛酸酯（KR12）和偏苯三酸酐甲基丙烯酸氧乙酯（4 - META）。在各种实验条件下测定了复合材料的抗压强度和横向强度。经KR7处理的二氧化钛复合材料的抗压强度高于未经处理的二氧化钛复合材料。经4 - META处理的二氧化钛复合材料的横向强度高于未经处理的二氧化钛复合材料。当二氧化钛用KR7和4 - META的混合物处理时，抗压强度和横向强度均增加。对断裂的复合材料表面进行扫描电子显微镜观察发现，未经处理的试样出现二氧化钛 - 聚合物界面破坏，而经KR7 + 4 - META处理的试样出现聚合物内聚断裂。结果表明，经KR7和4 - META处理的二氧化钛可作为固定义齿复合材料不透明材料的颜料。
