In Vitro Study Comparing the Marginal Leakage of Different Powder/Liquid Ratios of ZOE.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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This study assessed the marginal leakage of three powderliquid ratios of a temporary cement ZOE, which was inserted into simulated endodontic access preparations placed in tooth structure, as well as in amalgam and composite resin. Class V cavity preparations with a 90 degrees vacosurface angle were made in 110 anterior and bicuspid extracted human teeth. Thirty of these teeth were set aside to await placement of the temporary mixes. Forty of the teeth were restored with amalgam and the remaining 40 with composite resin. Ten each from the amalgam and composite resin groups served as controls. All specimens were aged two weeks before the temporary cement was placed. All 30 experimental teeth in each of the three groups had simulated access preparations placed into tooth structure or through the restorative material. In each group, 10 teeth were then restored with a thin ZOE mix, 10 with a medium mix, and 10 with a thick mix.
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