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From Flashcardlet > impressions > Flashcards

impressions Flashcards

0
Q

What is a study model?

A

Positive life sized production of the teeth and surrounding tissues

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1
Q

What is a dental impression?

A

Negative imprint of oral structure used to make a positive replica

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2
Q

What are study models used for?

A

Study or oral condition
Prep for tx planning
Pt instruction

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3
Q

What impression should be taken first?

A

Mandibular

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4
Q

What is alginate impression material?

A

Irreversible hydrocolloid

Carboxylated polysaccharide based on alginate acid gels cross linking with calcium ions

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5
Q

What is alginate composed of?

A 
Sodium alginate
Calcium phosphate 
Sodium phosphate
Zinc carbonate
Ph indicators
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6
Q

What component acts as retarder?

A

Sodium phosphate

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7
Q

What component acts as filler?

A

Zinc carbonate

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8
Q

What is ideal gelation time re. Alginate

A

3-4 minutes

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9
Q

What is spatulation time re. Alginate?

A

1 minute

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10
Q

What is working time re. Alginate ?

A

30 seconds

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11
Q

What is ideal technique to load trays?

A

From one end to other, careful not to trap air bubbles

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12
Q

With regards to tray size.. What is suitable?

A

Length to cover retromolar area and tuberosity of maxilla
Clear most protruded anterior incisor
Wide enough to allow appropriate thickness of material

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13
Q

From what position should we work re mandibular impression?

A

From front of patient

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14
Q

From what position should we work re. Maxillary impression?

A

Work from behind patient

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15
Q

What solution should be used to disinfect?

A

Sodium hypochlorite for 5-10 mins

16
Q

What happens if soaked in sodium hypochlorite fro too long?

A

Distortion of impression

17
Q

How many actichlor tablets for how long?

A

10 tabs per litre for 2 mins

18
Q

What is the purpose of the inter occlusal record/wax bite?

A

Registration of normal positional relationship of opposing teeth

19
Q

How would you deal with a patient who has bad gag reflex?

A

Approach with confidence
Work quickly and efficiently
Instruct patient to breathe through nose
Allow patient to sit forward

From Flashcardlet (22 decks)

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