Operative Final Exam - Lectures: Amalgam Restorations and Quadrant Dentistry Flashcards Preview

AU13 - Operative Final Exam > Operative Final Exam - Lectures: Amalgam Restorations and Quadrant Dentistry > Flashcards

Flashcards in Operative Final Exam - Lectures: Amalgam Restorations and Quadrant Dentistry Deck (49)
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1

If the mouth was divided into a sextant, how many sections would there be and name their location.

- 6 sections
- maxillary left, right, and anterior
- mandibular left, right, and anterior

2

What is quadrant dentistry?

treating all of the affected teeth in 1 quadrant/sextant during the same visit as opposed to 1 tooth at a time

3

What are the advantages of quadrant dentistry?

- less number of appointments for patient
- less discomfort for patient
- more efficient and productive for dentist

4

What are the disadvantages of quadrant dentistry?

- increased chairside time
- does not follow the ideal treatment sequence (3 phases: get the patient out of pain, remove caries, and then restorative care)

5

What are some reasons to perform (indications) quadrant dentistry?

- adjacent interproximal caries ("kissing caries)
- multiple faulty restorations
- pediatric dentistry
- medically compromised patients

6

What are some reasons not to perform (contraindications) quadrant dentistry?

- lack of dental experience
- patient who have TMJ dysfunction syndrome
- patients who cannot stay in a reclined position for a long time

7

What is the formula of a low-copper amalgam?

Ag3Sn (gamma) + Hg --> Ag2Hg3(gamma1) + Sn7-8Hg(gamma2) + Ag3Sn (unreacted gamma)

8

What is the weakest phase of low-copper amalgam?

gamma2

9

What is the most corrosion-prone phase in low-copper amalgam?

gamma2

10

Which type of amalgam (high or low copper) has high creep? Why?

low-copper because gamma2 doesn't prevent gamma1 from sliding

11

What is creep?

the tendency of a solid material to flow or permanently deform under constant cyclic loading over time

12

What percentage of copper is considered a low-copper amalgam? A high-copper amalgam?

- low-copper amalgam = 6% Cu

13

What is the difference in phases between high-copper and low-copper amalgams?

high-copper amalgam has a n' phase of Cu6Sn5 so there is no gamma2

14

What is the composition of gamma?

Ag3Sn

15

What is the composition of gamma1?

Ag2Hg3

16

What is the composition of gamma2?

Sn7-8Hg

17

What is the composition of n'?

Cu6Sn5

18

What are the two types of high-copper amalgams?

- admixed alloy (lathe-cut and spherical)
- unicompositional (spherical)

19

What is the difference in the reaction formula of admixed alloy and unicompositional high-copper amalgams?

- admixed alloy has two steps: first step in which gamma2 forms and then second step in which n' forms so no gamma2 is left
- unicompositional is only one step in which n' forms (in addition to gamma1)

20

How is creep minimized in high-copper amalgam?

the n' phase prevents the sliding of gamma1 to minimize creep and marginal breakdown

21

Which amalgam particle shape (lathe-cut or spherical) requires less condensation forces since it has looser contact?

spherical

22

Which amalgam particle shape (lathe-cut or spherical) has a low packing density with more spaces?

lathe-cut

23

Which amalgam particle shape (lathe-cut or spherical) has a higher surface area so more Hg and more expansion?

lathe-cut

24

Which amalgam particle shape (lathe-cut or spherical) packs more efficiently and slides easier to make less voids and higher strength?

spherical

25

Which amalgam particle shape (lathe-cut or spherical) is difficult to achieve proximal contact?

spherical

26

Which amalgam particle shape (lathe-cut or spherical) requires a large diameter condenser for proper condensation?

spherical

27

What type of amalgam is used at OSU? Describe it.

- Permite C
- high-copper amalgam
- admix type (spherical and lathe-cut)
- zinc-containing (0.2%)

28

What is the problem with zinc-containing amalgams?

if moisture contaminates, it will cause delayed expansion

29

What is the difference between direct and indirect restorations?

- direct restorations are placed directly in the oral cavity as a soft plastic material to build lost structure before they set hard
- indirect restorations are fabricated outside the oral cavity (like crowns)

30

True or false: A rubber dam is not necessary in quadrant dentistry.

FALSE. A rubber dam is a prerequisite of quadrant dentistry.