Dental Materials - Zinc Polycarboxylate and Glass Ionomer Cements

Flashcards covering key vocabulary and concepts related to dental materials, specifically focusing on Zinc Polycarboxylate and Glass Ionomer Cements.

Zinc Polycarboxylate Cement

The first dental cement to exhibit chemical bonding to tooth structure.

Setting Reaction of Zinc Polycarboxylate Cements

Begins with dissolution of powder by acid, releasing zinc and magnesium ions, resulting in a cross-linked polycarboxylate matrix.

Compressive Strength of Zinc Polycarboxylate Cement

Approximately 55 MPa, which is lower than zinc phosphate cement.

Glass Ionomer Cement (GIC)

Materials based on the reaction of glass powder and polyacrylic acid, capable of bonding to tooth structures.

Classification of Glass Ionomer Cements

Includes Type I (luting cements), Type II (restorative), and Type III (lining or base cements).

Advantages of Glass Ionomer Cements

Bond chemically to tooth structure, release fluoride, and are biocompatible.

Cavity Varnishes

Materials used to coat freshly cut tooth structure, preventing pulp irritation.

Calcium Hydroxide Liner

Most used liner due to its therapeutic effect on the pulp, stimulating the formation of secondary dentin.

Applications of Zinc Polycarboxylate Cements

Used for cementation of inlays, crowns, bridges, cavity lining, and temporary fillings.

Disadvantages of Zinc Polycarboxylate Cements

Short working time (2.5 min) and adhesion to stainless steel instruments, complicating cleanup.