The Study On The Comparison Of The Stability Of Five Kinds Of Dental Cements

Dental bonding agents provide the link between a 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 many alternative materials have been introduced ,for example, polycarboxylate cement, glass ionomer cement(GIC), resin-modified glass ionomer cement(RMGIC).Glass ionomer cements are very popular in clinical treatment, principally because they combine the inherent ability to release fluoride with the desirable characteristics of biocompatibility and adhesion to tooth structure. Although used as restorative materials, cavity liners, and bonding cements, early glass ionomer materials had unfavorable physical properties such as poor wear resistance, brittleness, low compressive strength, poor esthetics, and sensitivity to moisture contanmination, especially its great susceptibility to contamination by moisture. Contacting with water at an early stage during setting changes the setting reaction of GICs, which will change the cement properties.