Sidhu S K, Shah P M, Chong B S, Pitt Ford T R
Department of Conservative Dentistry, United Medical and Dental Schools, Guy's Hospital, London, England.
Quintessence Int. 1996 Sep;27(9):639-43.
This in vitro study compared the relative radiopacities of three commercially available resin-modified glass-ionomer cements (Vitremer, Fuji II LC, and Photac-Fil), an experimental resin-modified glass-ionomer (V-66), two conventional glass-ionomers (ChemFil and Fuji Cap II), and amalgam (as the control). Radiopacity was assessed densitometrically and expressed as equivalent thicknesses of aluminum. All the glass-ionomer cements were more radiopaque than enamel and dentin, with the exception of ChemFil and Photac-Fil. Apart from the control material, the experimental resin-modified glass-ionomer material, V-66, had the highest radiopacity of all the materials tested. Of the three resin-modified glass-ionomer materials tested, Fuji II LC was the most radiopaque and Photac-Fil the least. For the radiopacity of restorative glass-ionomer materials to exceed that of enamel, it should be greater than 1.5 mm of equivalent thickness of aluminum.
这项体外研究比较了三种市售树脂改性玻璃离子水门汀（Vitremer、Fuji II LC和Photac-Fil）、一种实验性树脂改性玻璃离子水门汀（V-66）、两种传统玻璃离子水门汀（ChemFil和Fuji Cap II）以及汞合金（作为对照）的相对射线不透性。通过密度测定法评估射线不透性，并表示为铝的等效厚度。除ChemFil和Photac-Fil外，所有玻璃离子水门汀的射线不透性均高于牙釉质和牙本质。除对照材料外，实验性树脂改性玻璃离子材料V-66在所有测试材料中具有最高的射线不透性。在所测试的三种树脂改性玻璃离子材料中，Fuji II LC的射线不透性最高，Photac-Fil最低。对于修复性玻璃离子材料，若要使其射线不透性超过牙釉质，则其等效铝厚度应大于1.5 mm。
