Dickens-Venz S H, Takagi S, Chow L C, Bowen R L, Johnston A D, Dickens B
American Dental Association Health Foundation, Paffenbarger Research Center, Gaithersburg, MD 20899, USA.
Dent Mater. 1994 Mar;10(2):100-6. doi: 10.1016/0109-5641(94)90048-5.
The purpose of this study was to improve the handling and physical properties of a self-setting, water-based calcium phosphate cement by combining it with polymerizable resins and to study the setting reactions involved.
Dual-cured composite cements were prepared from a calcium phosphate cement powder and dental monomers that contain carboxylated hydrophilic resins or resin/water mixtures. The setting reaction of the calcium phosphate cement in the presence of the resins was evaluated by pH measurements, infrared spectroscopy, diametral tensile strength, x-ray diffraction analysis, and scanning electron microscopy.
Carboxylated resins were chosen because they can form ionic bonds to the mineral filler, which was confirmed by appearance of an infrared absorbance peak at 1552 cm-1 within 24 h after mixing due to the formation of a carboxylate salt. Hydroxyapatite did not develop in composites prepared from resin and calcium phosphate cement. However, composites from calcium phosphate cement, resin and water showed approximately 40% hydroxyapatite. The resulting composite cements have moderately high DTS of 14-15 MPa and high pH.
Hydrophilic acidic resins allows mixing with water and/or allow rapid diffusion of water into the resinous cement so that the dissolution and reprecipitation processes required for the conversion of the calcium phosphate components to hydroxyapatite can occur. The characteristics of the resulting composite cements suggest that the materials may be useful in pulp capping and/or cavity lining.
本研究的目的是通过将自凝水基磷酸钙骨水泥与可聚合树脂相结合来改善其操作性和物理性能，并研究相关的凝固反应。
用磷酸钙骨水泥粉末与含有羧化亲水性树脂或树脂/水混合物的牙科单体制备双重固化复合骨水泥。通过pH测量、红外光谱、径向拉伸强度、X射线衍射分析和扫描电子显微镜评估树脂存在下磷酸钙骨水泥的凝固反应。
选择羧化树脂是因为它们能与矿物填料形成离子键，混合后24小时内在1552cm-1处出现红外吸收峰，这证实了羧酸盐的形成。由树脂和磷酸钙骨水泥制备的复合材料中未形成羟基磷灰石。然而，由磷酸钙骨水泥、树脂和水制成的复合材料显示出约40%的羟基磷灰石。所得复合骨水泥具有14-15MPa的中等较高径向拉伸强度和高pH值。
亲水性酸性树脂允许与水混合和/或使水快速扩散到树脂骨水泥中，从而使磷酸钙成分转化为羟基磷灰石所需的溶解和再沉淀过程能够发生。所得复合骨水泥的特性表明这些材料可能可用于牙髓盖髓和/或窝洞衬层。
