Cements

Question 1

what are Dental cements used for?

Answer 1

Cements create a connecting layer to adhere to the 2
surfaces

Question 2

what are the different types of cements?

Answer 2

• Type I: Luting agents.
  -Permanent and temporary
• Type II: Restorative materials
• Type III: Liners or bases placed within the cavity preparation

Question 3

Luting cements are made of

Answer 3

water based, oil based or resin based

Question 4

Permanent cement is used for

Answer 4

For the long‑term cementation of inlays, crowns, bridges, laminate veneers, and orthodontic fixed
appliances

Question 5

what is temporary cement used for

Answer 5

Provisional coverage to protect the tooth until the permanent restoration is ready to be cemented

Question 6

what are resin-based cements?

Answer 6

Resin cements are low-viscosity versions of restorative composites

Question 7

what is used in the one paste system for resin based cements?

Answer 7

Methacrylate monomers, initiator

Question 8

what is used in the two paste system for resin based cements?

Answer 8

• Base paste: methacrylate monomers, fillers
• Catalyst paste: methacrylate monomers, fillers, activator (for
  chemical-cure)

Question 9

how are resin based cements cured?

Answer 9

• Light (less common due to incomplete polymerization)
• Chemical reaction

Question 10

Temporary Resin Cements Eliminates the problem of

Answer 10

potential contamination of teeth
by eugenol and other oil-based cements when bonding
agents and resin cements (easy to mix/clean, low compressive strength)

Question 11

what is the composition of 3M-ESPE ReyX veneer cement?

Answer 11

• The resin BisGMA and TEGDMA
• Fillers: Zirconia/silica and fumed silica ~66% by weight
  (0.6 mm)

Question 12

Are bases or cements stronger?

Answer 12

bases are strongest and provide better mechanical support, thermal protection

Question 13

low strength bases act as a

Answer 13

barrier to irritating chemicals and provide therapeuti benefit to pulp

Question 14

what are some uses for cements?

Answer 14

luting, temporary filling materia, base (Protection to the pulp from
irritants), Liner (Pulp-capping agent)

Question 15

Glass Ionomer Cements (GIC)
(Water-Based) are used as:

Answer 15

• As restorative material
  -Class III and V
  -Intermediate restorations
• As luting material
  -Luting cements
  -Adhesives for orthodontic appliance
• As base
  -Pit and fissure sealants
  -Core buildup materials

Question 16

what is the composition of GICs?

Answer 16

• Liquid: Polymeric-water soluble acid
• e.g., polyacrylic or polycarboxylate acids
• Powder: Glasses (aluminosilicate)
• Water

Question 17

what is the rxn of GiCs?

Answer 17

formation of a cross-linked gel
matrix that surrounds the partially reacted powder particles

Question 18

what is the setting rnx of GICs?

Answer 18

–Acid starts to dissolve the
glass (powder), releasing
calcium, aluminum, sodium,
and fluorine ions
–Polyacrylic acid chains are then
cross linked by Ca 2+
–Fluorine ions are dispersed in matrix

Question 19

ended at 5.38