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Patient Care II > Exam 2: Dental Cements > Flashcards

Exam 2: Dental Cements Flashcards

1
Q

What are the types of cements?

A
  • ZINC PHOSPHATE
  • ZINC OXIDE EUGENOL
  • ZINC POLYCARBOXYLATE
  • GLASS IONOMER
  • RESIN-MODIFIED GLASS IONOMER
  • PROVISIONAL CEMENTS
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2
Q

It is important to note that no cement will perform to it’s optimal level clinically without an _____________

A

ADEQUATE PREPARATION

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3
Q

What are the important characteristics to consider about cements?

A

 BIOCOMPATIBILITY
 RETENTION
 MECHANICAL PROPERTIES
 MARGINAL SEAL
 LOW FILM THICKNESS
 EASE OF USE
 RADIOPACITY
 ESTHETICS

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4
Q

What are the important mechanical properties of cements?

A

withstand occlusal forces, high tensile strength

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5
Q

The first cement in dental literature was…

A

zinc phosphate

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6
Q

Which cement is the gold standard?

A

zinc phosphate

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7
Q

What are the advantages of zinc phosphate?

A
  • thin film thickness
  • proven reliability
  • low solubility (resists breakdown in mouth)
  • low thermo-conductivity (less sensitivity)
  • long shelf life
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8
Q

What are the disadvantages of zinc phosphate?

A
  • initial low pH (pulpal irritation)
  • no chemical adhesion/bond
  • no antibacterial properties
  • poor esthetics (for all porcelain)
  • long setting time (2.5-8 minutes)
  • exothermic (chilled glass slab when mixing)
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9
Q

What is the setting time for zinc phosphate?

A

2.5-8 minutes

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10
Q

How do you overcome the exothermic properties of zinc phosphate?

A
  • mix on a chilled slab
  • small amounts of powder added to liquid
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11
Q

What are the two types of zinc oxide eugenol (ZOE) cement?

A

Type 1: Temp-bond
Type 2: IRM

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12
Q

What are the properties of type 1 zinc oxide eugenol cement?

A
  • less strong
  • used for temporary restorations and for temporary cementation
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13
Q

What are the properties of type 2 zinc oxide eugenol cement?

A
  • reinforced and stronger
  • intermediate restorative
  • lasts 6-12 months in the mouth
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14
Q

What are the benefits of zinc oxide eugenol cement?

A
  • neutral pH
  • sedative or soothing effect on the dental pulp
  • protective/insulating base or liner is not required
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15
Q

What can you not use zinc oxide eugenol cement under?

A

not used under composite or acrylic restorations becuase eugenol is incompatible with these materials (retards the setting process)

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16
Q

What is the mixing time of zinc oxide eugenol cement?

A

30-60 seconds

17
Q

What is the setting time of zinc oxide eugenol cement?

A

3-5 minutes

18
Q

What is the first cementing system to obtain an adhesive agent that bonds to enamel and dentin?

A

zinc polycarboxylate

19
Q

What are the advantages of zinc polycarboxylate?

A
  • bonds to enamel and dentin
  • antibacterial action
  • shorter working time (2.5 min)
  • not as fragile as zinc phosphate
20
Q

What are the disadvantages of zinc polycarboxylate?

A
  • poor marginal sealing due to film thickness
  • doesn’t always support occlusal stress well
  • does not bond to gold
  • difficult to remove excess cement (rubbery)
  • has to be mixed fast (30-40 sec)
  • not used as often
21
Q

What is the working time of zinc polycarboxylate?

A

2.5 minutes

22
Q

What is the mixing time of zinc polycarboxylate?

A

30-40 seconds

23
Q

What is important about dental materials?

A

bitches are expensive

don’t waste the shit

love the earth (unlike dom)

24
Q

What are glass ionomers also known as?

A

acid-base cement

25
Q

What are the characteristics of glass ionomer?

A
  • very thin film thickness
  • extremely moisure tolerant
  • fairly soluable
  • fluoride release over time
  • working time affects film thickness
26
Q

What is the mixing and palcement time for glass ionomers?

A

2-2.5 minutes

27
Q

How long for the final set of resin-modified glass ionomers?

A

24 hours

28
Q

What is added to make a resin-modified glass ionomer compared to the regular version?

A

hydrophilic methyacrylate monomers

29
Q

What is the disadvantage of resin-modified glass ionomer?

A

low early strength and moisture sensitive during setting

30
Q

What is the key role for keeping the temporary restoration on the tooth while waiting for the final to return from lab?

A

provisional/temporary cements

31
Q

What are the characteristics of provisional/temporary cements?

A
  • needs to be easily removed from prepared tooth
  • most have eugenol (ZOE) which provides antibacterial effect
  • ex: temp-bond, ultra-temp, relyx temp
32
Q

What should you consider when selecting a provisional/temporary cement?

A
  • How long?
  • How retentive?
  • What will permanent cement be?
  • Working in esthetic zone

Patient Care II (10 decks)

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