# The mechanism of adhesion of glass ionomer cement restoration with tooth surface is by means of:
A. Carboxyl group of polymer chains
B. Chelates with metal ion
C. C=C double bond
D. Hydroxyl group
The correct answer is A. Carboxyl group of polymer chains.
Glass ionomers bond to tooth structure by chelation of the carboxyl groups of the polyacrylic acids with the calcium in the apatite of the enamel and dentin, in a manner similar to polycarboxylate cement.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 321
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