Abstract
Z inc phosphate cement has been used as a standard luting agent for cast restorations for many years. The retentive force of the cement measured 13% surface adhesion and 87% interlocking force when analyzed by Fusayama et al.’ with cylindric inlays. Polycarboxylate cement proved to be superior to zinc phosphate cement in adhesion to tooth substances and in pulpal compatibility.’ The technical and chemical properties of this type of cement were improved by the development of a water-settable cement.3 A new type of polycarboxylate cement (HY Bond Carbocement, Shofu Dental Mfg. Co., Kyoto, Japan) was recently developed by adding HY agent, a cariespreventing agent that contains zinc fluoride, strontium fluoride, tannic acid, and other components prescribed by Yamaga.4 When tested by Yamada et a1.,5 the addition of the HY agent did not significantly alter the compressive strength, diametral tensile strength, or film thickness, but it slightly decreased disintegration in lactic acid. The three above-mentioned types of cements (Table I) were compared for surface adhesion to tooth substances and dental casting alloys, as well as retentive force of cemented restorations.
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