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Resto > Dental amalgam > Flashcards

Dental amalgam Flashcards

1
Q

Functions of Wedges

A
  1. adapt the cervical part of the mb closely to prevent cervical overhangs (which are plaque retentive)
  2. retract the gingiva during cav prep
  3. for temporary separation of the ts: separation shd be = mb thickness
  4. so that the ts will come in contact w/ each other. If there is no wedge, there is a space <0.0015 once the mb is removed (where food and bacteria can go in)
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2
Q

what does undercarving do?

A
  1. may raise the bite (with prematurities) w/c may cause discomfort if not relieved
  2. poor occ anatomy results
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3
Q

functions of matrix bands

A
  1. provide for missing wall
  2. provide general contour of the proxl surf of resto
  3. places the contact area at the desired level
  4. imparts good finish to the resto
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4
Q

what is the most commonly used matrix band?

A

universal matrix or the tofflemire

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5
Q

where do you place the the retainer holder of tofflemire?

-what is the advantage of tofflemire?

A
  • buccall to the th you are working on bec there is more space
  • can be used even when there are 2 or more walls missing [MODB]
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6
Q

retainerless system and often used when you have to fill a large cav prep where 2 or more cusps are missing

*what is the disadvantage?

A

automatrix

*difficult to contour

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7
Q

Tofflemire:

  • if gingival flr is ideal/supragingival use:
  • if subgingival use:
A
  • use type 1

- type 2

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8
Q

the position for a typical interprxl cav prep is approx. 1-2mm above the proposed margl ridge OR
same level as the highest cusp [occlusally], and 1mm below gingv margin [cervically]

A

when placing the band

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9
Q

what is the main purpose of the careful resto of contact areas

A

to protect gingival tissues

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10
Q

long axis shd be parallel w/ the dental arch. its slot shd be towards the gingival bec you will remove it occlusally.
-the slot corresponds to the concave side

A

mb holder

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11
Q

the polished layer of a resto is

A

‘Beilby layer’

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12
Q

what are the advantage of polishing?

A
  1. less susceptible to tarnish and corrosion

2. resto lasts longer

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13
Q

polishing done at low speed becoz:

A
  1. danger of elevating temp of resto and then th w/c may cause pulp or resto damage
  2. danger of rubber cup flying apart at hi-spd
  3. brings Hg to the surface w/c would lead to corros’n of Am and loss of strength
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14
Q

What are the order of procedures dental amalgam?

A
  1. Trituration
  2. Condensation
  3. Pre-carve Burnishing
  4. Carving
  5. Restore the Occlusion
  6. Post-carve burnishing
  7. Polishing
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15
Q

Trituration mix shd produce:

A

a smooth, non granular, plastic mass of Am

*not to wet and not too dry

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16
Q

low Hg-to-alloy mixing ratio

e. g. 1 pellet: 1 drop from Hg dispenser
- aka ‘no squeeze cloth technique

A

Eames technique

17
Q

enhances the uniformity and plasticity of the mass; a continuation of tritur’n

A

mulling

18
Q

special note about condensation

*why

A

before titration, prepare everything for condensation

*because a delay in condensation leads to decreased plasticity and perhaps greater Hg in the final resto

19
Q

Objectives to Condensation

A
  1. to adapt Am intimately to the prepared walls and margins
  2. to compact the Am mass, thereby producing as uniform and void-free a resto as possible
  3. to reduce the Hg content to as low a level as possible
20
Q

4 phases of Am:

  1. gamma
  2. gamma 1
  3. gamma 2
  4. voids or air pockets
A
  1. Ag and Sn (strongest)
  2. Ag and Hg
  3. Sn-Hg
  4. undesirable bec non uniformity or lack of compactness decreases the strength
21
Q

what needs to be controlled

A
  • saliva
  • tongue, lips, cheeks, gingiva
  • contacting ts and restos
  • debris and water coolant
22
Q

what can be used as salivary control?

A
  1. pharmacologic
    - antisialogogues-drugs that suppress saliva
    - anesthetics-px less sensitive to stimuli and less anxious producing less saliva
  2. Fluid and debris evacuating equipments
    - high-volume evacuators
    - saliva ejector
  3. Fluid absorbing materials
    - cotton rolls: needs to be changed frequently bec are easily saturated
    - gauze: throat shields
    - absorbant cotton pads and wafers: to retract cheeks and provide absorbancy
  4. Rubber dam
    - mildy retracts the gum
23
Q

a rubber guard stretched tightly around a tooth

  • absolute dyness for a long time
  • mildly retracts gums, lips, cheeks, tongue
  • saves a lot of time in long run
  • not for asthmatic px if breathing is difficult
A

rubber dam

24
Q

what to do w/ rubber dam sheet?

A

punch holes in the rubber dam sheet and slide tooth in while clamping it, w/ help of r.d forcep, the frame keeps r.d. in place

25
Q

what are some Tissue Retraction and protection?

A
  1. mouth mirror
  2. rubber dam
  3. special types of sal. ejec. and HVE tips
  4. gingival tissue management
26
Q 
gingival tissue management
techniques
1. mechanical 
2. chemomechanical
3. surgical
A
  1. if cervical lesion not deep use r. dam
    - also can use wedge
  2. not only retracts gingiva, but also controls hemorrhage
    - retraction cords
  3. surgical: scalpel blades used to cut off gum tissue, or electrosurgery, to cauterize gums
27
Q

where are retraction cords placed?

and to do what?

A
  • tucked into gingival sulcus

- to obtain minimal lateral displacement of free gingiva and not force apically

28
Q

how to insert retraction cords

A

use thin, blunt-edged blade or side of explorer or spoon excavator
-ideally used w/ anesthesia

29
Q

what do retractions cords have on them?

A
  • astringents (allum, ZnCl, tannic acid)

- vasoconstrictors (epinephrine)

30
Q

what do retraction cords do?

A
  • constricts bld vessels so gum tissue decreases in volume

* but may be contraindicated in pxs w/ hypertension, hyperthyroidism, diabetes

31
Q

method used to achieve adequate control of operative field

A 
A. Saliva control
B. Tissue Retraction and Protection
C. Illumination and Viewing
1.overhead light
2. mouth mirror
3. light attached to handpiece
D. Use of air-water spray syringe

Resto (2 decks)

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