Final answer:
Polycarboxylate cement is supplied in the form of Powder and Liquid, with the powder usually containing zinc oxide and the liquid containing polyacrylic acid.
Step-by-step explanation:
Polycarboxylate cement is commonly supplied in two forms: A) Powder and liquid. This dental cement is widely used for the cementation of prosthetics and orthodontic appliances. The powder component is generally composed of zinc oxide, magnesium oxide, or a combination of both, and sometimes includes additives to modify the properties of the cement.
The liquid component typically contains polyacrylic acid, which reacts with the powder to form the cement upon mixing. This reaction leads to the creation of semi-flexible polymers and polymer gels, which provide the cement with its desirable characteristics, such as elements of elasticity and the adhesion desirable for the long-term retention of dental appliances.