Operative Dentistry - Dental liners and bases - Part 2
Dental Liners and Bases Polyc arboxylate cement Was the first adhesive material developed for use in dentistry supplied as: Powder + liquid - The powder is zinc oxide and magnesium oxide. (Stainless steel fibres + alumina to increase the strength) - The liquid is a weak solution of polyacrylic acid (30-50%) which is very viscous Or supplied as: Water hardening cement or water setting P: zinc oxide or glass powder is mixed with the powdered anhydrous, freeze, dried, polyacrylic acid. L: water Properties - Polycarboxylate cement is not as acidic as ZPC because of the PH of polycarboxylate rises more rapidly than that of ZPC. - The large size of the polyacrylic aci...