Zinc oxide-eugenol mixt ures have bee n used in dentistry for a number of years. The setting m echanism of these mixtures was investigated. X-rav diffraction dat a and electron photomicrovaphs g ive ~vid~n ce that a crystll:lline compound is formed. Analysis and molecular-weight dettrml.nat lons show t hat th,s compound corresponds t o the empirical formula (OIOH l.' O2) 2 Zn, ztn C euge nolate. Infrared data, as well as t he nonreactivity of meta and I?ara substituted phe nols as compared to the ortho isomers, suggest that t he zinc e ugenolate IS a chelate. The hardened mass consists of zinc oxide e mbedded in a matrix of long sheath-like crystals of zin c eugenolate. The excess eugenol is sorbed by bot h t he zinc e ugenolate and the zinc oxide.
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