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Dental materials 1 > finishing and polishing > Flashcards

finishing and polishing Flashcards

1
Q

what is the purpose of finishing and polishing

A

they are meant to remove excess material and smooth roughened surfaces

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2
Q

what is the purpose of cleansing

A

cleansing techniques are meant to remove food and other debris from a surface without damaging it

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3
Q

what are dentifrices

A

pastes or powder used to clean the teeth

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4
Q

what is abrasion

A

a wearing process

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5
Q

are the materials used for finishing and polishing abrasive

A

yes they primarily are

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6
Q

what dose abrasion result from

A

it results whena hard rough surface such as sandpaper disk plows grooves into a softer material and cause material from such grooves to be removed from the surface

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7
Q

what are the 3 factors that primarily affect the rate of abrasion

A

speed at which the abrasive material travels across the surface being abraded
size
pressure

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8
Q

what is the surface roughness and what is its symbol

A

the measure of the irregularity of the finished and polished surface and is measured in micrometers,Ra

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9
Q

what is the Ra of a SMOOTH surface

A

the surface roughness is less than 0.2 micrometers and is desirable to reduce retention of bacteria and to have a shiny appearance

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10
Q

what is gloss

A

the measure of the reflection of light from a surface

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11
Q

how many GU (gloss units) does a totally non-reflective surface have
and glass

A
  1. 0 GU

2. glass has 1000 GU

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12
Q

when is it low-gloss,semi-gloss-and high-gloss respectively

A

less than 10,10-70,greater than 70 is considered high gloss

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13
Q

what are the 3 types of abrasives

A

finishing,polishing,and cleansing abrasives

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14
Q

classify dental abrasives from most to least rough

A

finishing, polishing, cleansing

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15
Q

what abrasives are used in AIR-ABRASION units commonly used for finishing

A

aluminum oxide

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16
Q

name 7 types of abrasives

A
  1. aluminum oxide
  2. quartz(sio2)
  3. sand( a form of quartz)
  4. garnet
  5. DIAMOND
  6. SILICON CARBIDE(SIC)
  7. pumice
17
Q

how is an amalgam restoration polished

A

polishing is perflrmed with a creamy paste of extra fine silex abd water applied gently in an unwebbed rubber cup with a slowspeed hanpiece for 30 sec per surface

18
Q

why is the roughness of finished and polished Gic higher than that of composites and hybrid inomers

A

because of the larger particle sizes of the filler

19
Q

what does MTA stand for and what is its purpose

A

mineral trioxide aggregate, used in a single step procedure as an apical barrier, allowing obturation-sealing- in the same appointment

20
Q

what is mta used for

A

MTA is used for creating apical plugs during apexification, repairing root perforations during root canal therapy, and treating internal root resorption.

21
Q

what is apexification

A

it is a procedure a dentist or endodontist performs to close the end of an open tooth root. It’s often required for treating permanent teeth with incompletely formed roots that require root canal therapy

22
Q

what is the best material to use when it comes to restoration that are in proximity to the gingiva

A

GIC

not composite

23
Q

how can we measure smoothness by color,give ab example

A

closer to white-> smooth
closer to black->rough

so yellow is smoother than orange
black is more coarse than brown

24
Q

when is the process of finishing and polishing done for

  1. amalgam
  2. composite
  3. compomer
  4. GIC
  5. Hybrid inomer
A
  1. the next day
  2. directly after application
  3. directly after application
  4. after 24 hrs
  5. after 24hrs
25
Q

what can and cannot be used as a prophylaxis if amalgam restoration is present

A

what can be used are products containing pumice or khaffan but zirconium silicate cannot be used for its large rough particles.

26
Q

what ingredient in grey MTA is responsible for tooth discoloration

A

ferrous oxide, the replacement of it by magnesium oxide in white MTA

27
Q

why does MTA have antibacterial properties

A

because of it high PH level, very basic

Dental materials 1 (4 decks)

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