Plastic restorations - Introduction to dental cements Flashcards
How are dental cements formed?
acid + base reaction
= liquid and powder
What do the properties of the cement depend on?
the constituents
What are the 3 acids?
poly (acrylic acid)
phosphoric acid
eugenol
What are the 2 bases?
zinc oxide
pluro-alumino silicate glass
Poly (acrylic acid) and zinc oxide make what?
zinc polycarboxylate cement
What does poly (acrylic acid) and fluro-alumino silicate glass make?
glass ionomer cement
What does phosphoric acid and zinc oxide make?
zinc phosphate cement
What does phosphoric acid and fluoro-alumino-silicate glass make?
silicate cement - not used now
What does eugenol and zinc oxide make?
zinc eugenolate (zinc oxide eugenol cement)
Is the general structure of cements the same?
yes, basically the same
What part of the particles react with the acid?
only surface particles
What are the features of set cement?
composed of unreactive cores of powder surrounded by the matrix of the reaction product
cored structure
When would you use cement?
dressing/temporisation (patient has lost a filling, temporary filling material)
semi/definitive restorations
luting cast restorations (hold cast on to restoration)
What are the 4 traditional cements still in use?
zinc polyalkenoate cement
glass polyalkenoate cements (glass ionomer cements)
zinc phosphate cement
zinc eugenolate (zinc oxide eugenol cement)
what is the liquid part?
liquid
