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removable > Lecture 2 > Flashcards

Lecture 2 Flashcards

1
Q

what is important to tell the patient went making a denture

A

Let them know the shortcominges

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2
Q

what are the characteristics of an Ideal MAxillary ridge

A 
Abundant keratinized attached tissue
Square arch form
Firm, broad and tall residual ridges
Moderate Palatal vault
Low frena attachments
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3
Q

what are the characteritisc of an ideal mandibular ridge

A 
Well-defined retromolar pad
abundant attached keratinized mucosa
Firm, braod and tall residual ridges
Deep retromylohyoid space
Low frena attachments
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4
Q

what is the problem with high frena attachments

A

will pull denture away

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5
Q

what can be done if you have poor retentive features in a patient for a denture

A

Place implants to aid in holding

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6
Q

what do you tell paitent to do when selecting an edentulous stock stray

A

Direct patient to pucker and smile after seating tray and alginate
- then relax while material sets

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7
Q

where should a maxillary edentulous stock tray extend

A

Beyond the pterygomaxillary (hamular) notch and vibrating line onto the soft palate

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8
Q

what do you tell the pateient to do when selecting a mandibular edentulous stock tray

A

Have patient protrude tongue and touch upper lip while material sets

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9
Q

what must a mandubular impression tray cover

A

Retromolar pads

extend to capture retromylohyoid fossa

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10
Q

how should a well-made preliminary impression lok

A

must have proper border extensions and all relevent anatomy captured

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11
Q

Diagnostic cast requirements

A

4-5mm land area
2-3mm deth of peripheral roll
15mm thickness

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12
Q

why should a diagnositic cast be a certain thickness

A

To avoid breaking

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13
Q

what is a custom impression tray

A

An individualized tray specific to eachpatient used for final impression purposes

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14
Q

what is the purpose of a custom tray

A
  • Minimize impression material distortion (uniform thickness= accuracy
  • Prevent tissue distortion (less viscous material = more accurately adapted tray)
  • allow for accuracy by molding the borders resulting in better retention
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15
Q

how should a custom impression tray be addapted

A

to the contours of the preliminary cast with the borders approximating the outline of the complete denture

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16
Q

what is the goal of border molding

A

Allows for formation of the peripheral seal

17
Q

what does a custom impression tray need to capture

A

Borders and movements

18
Q

how far should a Custom tray go into the vestibule

A

2-3 mm short of the dept of the vestibule

19
Q

goal of wax thickness for a custom tray

A

minimal wax thickness

20
Q

how thick should a custom tray be

A

2-3mm tray thickness

21
Q

how should the handle be shapped

A

45 degree handle

- not impinge on the vestible or distort the lipd

22
Q

presence of finger rests on custom impression trays

A

on the 1st molar and 2nd premolar as to not distort the vestibule when border molding and making the mandibular final impression

23
Q

how many layers of wax should be used on edentuous patients

A

1 layer just short of the vestible

24
Q

why leave tray 2-3mm above the vestible

A

to allow for movements

25
Q

what is the purpose of the wax spacer

A

Provide room for the impression material and ensure a consistently repeatable positioning during tray placement

26
Q

what is the problem with a too large handle

A

Can hurt border molding

27
Q

what is the other way of providing tray relief

A

Placing stops in the custom tray
maxilla: posterior alveolar ridge
Mandible: buccal shelves and posterior alveolar ridge

28
Q

how many layers of triad tray material should you use

A

1 layer

29
Q

size of the handle

A

9mm height
10mm wide
- a small roll of material over the incisive papila region

30
Q

why place stops on mandibular trays

A

hold the tray inplace when border molding

31
Q

should the wax spacer be melted

A

No

32
Q

what is the advantage of using a wax spacer/tissue stop

A
  • creates tissue relief for impression material
  • center and stabilize the tray on an edentulous ridge
  • clinician has predictable positing on tray reinsertion to prevent over seating during border molding
33
Q

should wax come all the way to edge of the custom tray

A

no, 2mm away from the edge of the custom tray

34
Q

why shouldn’t wax come all the way to the edge of the custom tray

A

allow for border molding amterial to overlap the edge o the tray and form a U shaped joint
-holds the impression material in tray

35
Q

how should a custom impression tray look

A

No shap edges
Tray is stable on preliminary cast
Flat edges of tray
Uniform tray and wax spacer thickness

36
Q

should a tray touch the depth of the vestible

A

No

37
Q

what should the first border molding account for

A

The movements of the mouth

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