Cements

Question 1

What are the two most important factors in an ideal cement?

Answer 1

High compressive strength

-High elastic modulus

Question 2

What is film thickness?

Answer 2

-A measure of viscosity

Question 3

When using a powder/liquid cement what is an important concept that you need to remember?

Answer 3

-No powder remnants in mix

Question 4

What are the characteristics of zinc polycarboxylate?

Answer 4

• Kind to pulp
• Quite soluble
• Good intermediate strength
• Inexpensive
• Easy to mix
• Not technique sensitive
• Acidic (large acidic polymer molecules cannot penetrate dentinal tubules
• Weak Chelation bonds to calcium ions of enamel and dentin
• Unlimited shelf life
• Distilled water is the liquid component

Question 5

What are characteristics of zinc phosphate?

Answer 5

• Technique sensitive
• Early acidity can be irritating to pulp
• Inexpensive
• Excellent compressive strength
• Long history of success
• Time consuming to mix
• Moderately soluble when mixed properly

Question 6

What type of cement do you mix on cold glass slab to slow exothermic reaction and done incrementally?

Answer 6

-Zinc phosphate

Question 7

What are the properties of adhesive resin cements?

Answer 7

• Usually chemical cure
• Limited shades
• Bonds to many surfaces
• Strongest of bonds

Question 8

Which of the resin cements do you use with a separate bonding agent?

Answer 8

-Esthetic

Question 9

What do you use esthetic resin cement for?

Answer 9

• Veneers
• Lithium disilicate onlays
• Lithium disilicate crowns
• Zirconia crowns

Question 10

Do you apply both the base shade and the catalyst when cementing veneers?

Answer 10

-Just the base shade, no catalyst