| Dental bonding agents provide the link between the fixed prosthesis and the prepared tooth structure. Traditional zinc phosphate cement has been the most popular material, despite its well-documented disadvantages, particularly solubility and lack of adhesion. Therefore As a result of the development of dental materials, a variety of adhesive material has emerged, for exampla, polycarboxylate cement, glass ionomer cement(GIC) and resin composite. GIC combine the inherent ability to release fluoride with the desirable characteristics of biocompatibility and adhesion to tooth structure. The composite resin can not only color, and also has high mechanical strength, wear resistance and better surface properties. The compomer combines the advantages of both, so in recent years it is in extensive clinical use.The study was to assess the solubility of three kinds of dental bonding agents by Paffenbarger's weight test, to determine whether time of immersion and pH value have any influence on the solubility behavior of cements. To provide a theoretical basis of the selection of clinical bonding material and the long-term observation and evaluation of the bonding effect.Results: Significant differences in solubility and stability were found among the three kinds of cements(P<0.05).The sequence of stability from top to end is compomer, glass ionomer luting cement and zinc polycarboxylate cement. The pH value of solution seems to have an influence on the solubility behavior of the three test materials especially when it is 4.0. The time of immersion seemed to have influence on the solubiliaty behavior of the three test materials. For all of the observed cements, the copomer behaved best stability.
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