6. Record bases and occlusion rims Flashcards Preview

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Flashcards in 6. Record bases and occlusion rims Deck (29)
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1
Q

Define record base

A

-interim denture base used to support the occlusion rim materials

2
Q

Whats another name for a record base?

A

base plate

3
Q

What type of impression is used for record base in favorable cases?

A

mucostatic impressions

4
Q

What type of impression is used for record base in unfavorable cases?

A

functional impressions w/custom tray

5
Q

Record bases are used in these stages… (4)

A
  1. cast mounting
  2. arragement of denture teeth
  3. trial placement (wax try in)
  4. Flasking
6
Q

Record base purpose when carrying an occlusal rim? (4)

A

◦ Centric relation.
◦ Vertical dimension.
◦ Location of denture teeth.
◦ Occlusal plane.

7
Q

Recordbase thickness?

A

2mm

8
Q

Record base dimensional stability?

A

Acrylic resin shrinks over time, so they must be

made 24h before being used

9
Q

Record base materials? (4)

A
  • self curing resin
  • light curing resin
  • truwax (fragile, goodfit)
  • heat curing resin (volume changes w/curing)
10
Q

Record base manufacturing border design: Anatomical impressions, what class? up to where? (2)

A
  • class I & II

- mucogingival junction of cast

11
Q

Record base manufacturing border design: functional impressions, what class? up to where? (2)

A
  • class III & IV

- up to bottom of vestibule of cast

12
Q

Record base manufacturing border design: Anatomical impressions, where is the survey line? Where do we draw? (3)

A
  • greatest prominence of contour in relation to the planned path of placement of a restoration
    ◦ Draw line 1-2 mm passed survey line.
    ◦ If there is no survey line: draw line 2-3 mm shorter than bottom of the vestibule.
13
Q

Record base manufacturing border design: upper base design? (3)

A

◦ Draw line 1-2 mm passed survey line.
◦ Safety distance from frenuli.
◦ Posteriorly: Up to hamular notches and palatine foveae.

14
Q

Record base manufacturing border design: lower base design?

A

◦ Draw line 1-2 mm passed survey line.
◦ As usually there is no survey line: draw line
2-3 mm shorter than bottom of the vestibule.
◦ Safety distance from frenuli, retromolar trigone and retromylohyoid space.

15
Q

How do we adapt the record base to the cast when making it?

A

sponge

16
Q

Making a record base is similar to..?

A

making a custom tray

17
Q

Where do we trim the record base up to?

A

up to the free functional area of mucosa

18
Q

What do we do with the patient for the clinical assessment of the record base? (5)

A

◦ Pull lips.
◦ Thrust tongue.
◦ Open mouth.
◦ Move mandible laterally. ◦ Say letter “A”, “K”, “G” (ensures proper baseplate extension)

19
Q

Define occlusal rim:

A

Occluding surfaces fabricated on interim/final denture bases for MAXILLOMANIDUBLAR relation records & arranging teeth

20
Q

An occlusal rim determines what esthetic information? (6)?

A
  • Location of upper incisal edges.
  • Location of upper lip while smiling and at rest.
  • Occlusal plane.
  • Dental midline.
  • Location of the canines.
  • Tooth size.
21
Q

An occlusal rim determines what functional information? (4)

A
• Vertical dimension.
• Centric relation
• Cast mounting:
◦ Help in facebow transfer.
◦ Help in intermaxillary relation record.
22
Q

Occlusal rim material can NEVER be…?

A

SOFT waxes

23
Q

Material for occlusal rims? (2)

A
  • Hard waxes: Moyco type.

* Godiva: Rigid & Hard to handle.

24
Q

Height of upper occlusal rims?

A
  • 12 mm anteriorly

- 8 mm posteriorly

25
Q

Thickness of upper occlusal rims?

A
  • 5mm anteriorly

- 8mm posteriorly

26
Q

Inclination of upper occlusal rim?

A
  • anteriorly 15-20 degrees

- posteriorly 45 degrees

27
Q

Lower occlusal rim height and thickness?

A

8mm

28
Q

Finishing touches of occlusal rim: what materials do we use for hard wax? (2)

A

◦ Hot wax knife.

◦ Venetian plaster spatula

29
Q

Finishing touches of occlusal rim: what materials do we use for Godiva? (2)

A

◦ Blades (cutter).

◦ X-acto blade.