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Remo > CH4: VDO > Flashcards

CH4: VDO Flashcards

1
Q

UPPER rim IS SLIGHTLY ______ (BUCCAL/CENTERED/LINGUAL), WHILE THE LOWER RIM IS ____ (BUCCAL/CENTERED/LINGUAL) TO RIDGE

A

UPPER : BUCCAL

LOWER: CENTERED
TO RIDGE

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2
Q

Posterior extent of Maxillary wax rim ?

A

Anterior to tuberosity

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3
Q

Posterior extent of Mandibular wax rim ?

A

1/2 to 2/3 height RMP and ends at RMP

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4
Q

Incisal edges approx. ____ forward of the incisive Papilla

A

6mm

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5
Q

We use the ______ as a landmark & reproduce the tooth position of the Maxillary centrals with the Occ Rim

A

Inc Papilla

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6
Q

Do teeth show at rest position?

A

Y. 1-2mm teeth show at rest position

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7
Q

Location of High Smile line

A

High Smile line is at the CEJ of the Centrals

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8
Q

Midline should come from the ____

A

Face

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9
Q

The Lateral Plane is always parallel to the _____

A 
The Antero-Posterior Plane is
initially parallel to the Ala-Tragus Line
then modified upward as needed
during rim adjustment for the
Occlusal Plane
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10
Q

________ permits viewing
of both planes on Maxilla
simultaneously

A

Fox Occlusal Plane

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11
Q

Fricative Sounds:

A

Fricative Sounds: “F” and “V”

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12
Q

What position do Fricative Sounds determine in CDs?

A

Position of Incisal edges of Central Incisors

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13
Q

Position of Incisal edges of Central Incisors

A

Hits at or near the Wet-Dry Line

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14
Q

Area “A” on wax rim determines ____

A

Lip length & Fricatives

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15
Q

Once area A has been adjusted for esthetics

and phonetics, we do not touch it. T/F

A

T

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16
Q

Reveal of area “A”

A

.5-2mm reveal

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17
Q

Occlusal plane of

Area “D” is parallel to the _______ initially when we first insert the upper wax rim in the patient’s mouth

A

Ala-tragus line

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18
Q

Occlusal plane of area “C” is determined by _____

A

Height of Retromolar Pad *1/2 or 2/3 (depends on the type of tooth setup)

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19
Q

Occlusal plane of

Area “B” is determined by _____

A

Lip length & Dorsum of tongue

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20
Q

Mandibular occlusion rim is LOW to ____

A

stabilize the denture

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21
Q

Mandibular occlusion rim is SHORT to ____

A

distribute stress

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22
Q

1) Each occlusion rim is adjusted individually
2) both rims are NOT inserted simultaneously after adjusting them

T/F

A

1) T
2) F

After each rim has been adjusted
individually , both rims are inserted
simultaneously

*Rims must be FLAT & FLUSH

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23
Q

If rims not flush at Initial contact…change which area?

A

Area “D”

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24
Q

How to change “D” if rims are not flush?

A
  1. Lubricate lower rim
  2. Remove upper & warm area “D”
  3. Reseat & close until A contacts B
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25
Q

The rims must be flush to maintain ___

A

VDO

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26
Q

What is VDO

A

Vertical Dimension of Occlusion

– during Occlusal Contact

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27
Q

What is VDR ?

A

VDR = Vertical Dimension of Rest

– during Muscular Rest

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28
Q

____(Anterior/Posterior) teeth hold the VDO

A

Posterior

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29
Q 
When natural
teeth are in
occlusion,
ridge crests are
approximately a
minimum of
\_\_\_\_\_mm apart in the
anterior
A

12 mm

(Or:
The height of a tongue
blade – (Anterior)
+)

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30
Q

Minimum Inter-ridge Space: Anterior

A

12 mm

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31
Q

Minimum Inter-ridge Space: Anterior wrt tongue blade

A

The height of a tongue

blade

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32
Q

Minimum Inter-ridge Space: Posterior wrt tongue blade

A

The thickness of a

tongue blade

33
Q

Minimum Inter-ridge Space: Posterior

A

1-2 mm

34
Q

Freeway Space

A

The Freeway Space is the space

between the teeth when the mandible is at rest (VDR)

35
Q

____ (VDO/VDR) occurs during swallowing

A

VDO

36
Q

___ (VDO/VDR) occurs at the end of swallowing

A

VDR

37
Q

___ (VDO/VDR) occurs at the end of the “Emma” sound

A

VDR

38
Q

The mandible moves _____ (downward/upward) from VDR to VDO traveling a distance of about _____ mm

A
  • upward

- 2-3 mm

39
Q

The Freeway Space has an Anterior/Posterior ratio of ___

A

Freeway Space has an Anterior/Posterior ratio of 3:1

40
Q

Freeway Space increases with age – Averages ~____ mm

A

~2-3 mm

41
Q

FWS calculation

A

FWS = VDR -VDO

Avg ~3mm

42
Q

Free way space is ____ mm

A

2-3 mm

43
Q

Closest Speaking Space

A

The Closest Speaking Space is the small space

between the occlusal surfaces during sibilant sounds

44
Q

sibilant sounds

A

1) “S” sounds (Mississippi, 66, “s”)
2) “ch” – church, Massachusetts,sandwich
3) “j” – jelly, judge
4) “Z”

45
Q

Teeth ____(should/should not) contact during sibilant “S” sounds

A

Teeth should NOT contact during sibilant “S” sounds

46
Q

What results in clicking during sibilant sounds

A

Upper and lower tooth contact.

Teeth should not contact during sibilant “S” sounds
or “clicking” of the teeth together will result

47
Q

Clicking of teeth is NOT normal when VDO is correct.

T/F

A

T
Clicking of teeth is NOT normal when VDO is
correct, even if the patient is wearing porcelain teeth

48
Q

“S” sound determines:

A
  • Incisor position
  • Premolar position
  • VDO
49
Q

Closest speaking space is about ____mm

A

0.5-1 mm

50
Q

Neutral Zone

A

the potential space between the lips and cheeks
on one side and the tongue on the other; that area or position
where the forces between the tongue and cheeks or lips are equal.

51
Q

The denture teeth should be positioned in the ______ zone so the dentures
remain in equilibrium

A

Neutral Zone

52
Q

Space of Donders

A

Space of Donders is the
space between the palate
& tongue during VDR.

53
Q

Space of Donders is the
space between the palate
& tongue during ____ (VDO/VDR).

A

VDR

54
Q

↑VDO → _____(↓/↑)Space of Donders

A

↑VDO → ↑Space of Donders

55
Q

↓VDO → _____(↓/↑)Space of Donders

A

↓VDO → ↓Space of Donders

56
Q

Independent of VDO…
if the palate is too THICK, ______ will be decreased
and the patient will have trouble swallowing

A

Space of Donders

57
Q

Ant-post guidelines for anterior teeth:

A
  • Lip support
  • Naso-labial Fold
  • Vermillion border of the lip
  • Fricatives
58
Q

Incisal-occlusal plane orientation guidelines:

A
  • 1/2 -2/3 RMP

* Inter-pupillary Line

59
Q

Area A functions

A
  • Esthetics
  • Lip support
  • “F” sound
  • Inter-pupillary line
60
Q

Area B functions

A
  • VDO adjust

* “S” sound

61
Q

Area C functions

A

Retromolar pad

62
Q

Area D functions

A
  • VDO adjust

* “S” sound

63
Q

What areas may not be altered to change VDO?

A

areas “A” and “C”
“A” = Esthetics + Phonetics
“C” = Anatomy of Retromolar Pad

64
Q

What areas determine the Occlusal Plane?

A

areas “A” and “C”

65
Q

What areas determine VDO?

A

“A” + “B” and “C” + “D”

66
Q

What areas may be altered to

change VDO?

A

areas “B ” and “D”

“B” = Sibilants with “A”
“D” = Sibilants with “C”
67
Q

Sibilant areas

A 
“B” = Sibilants with “A”
“D” = Sibilants with “C”
68
Q

If rims not flush, ____ area is changed and this raises the plane from the ala-tragus line

A

D

69
Q

2/3 Retromolar Pad is used for ______(Curved/Flat) Occlusal Planes

A

Flat

70
Q

1/2 Retromolar Pad is used for ______(Curved/Flat) Occlusal Planes

A

Curved

71
Q

VDO & Plane are changed by tapering the rims

T/F

A

T.
VDO & Plane are changed by tapering the rims
(by adding or removing a wedge of wax).

72
Q

Does changing the VDO

always change the plane? (y/n)

A

Y
Changing the VDO
ALWAYS changes the plane

73
Q

Does changing the plane

always change the VDO? (y/n)

A

No.

Changing the plane doesn’t always change the VDO

74
Q

VDR (summary)**

A
  • Rest position
  • Postural position
  • Physiologic position
  • Muscular equilibrium
  • At end of swallow
  • At end of “Emma”
  • Helps determine VDO: (VDR-FWS=VDO)
  • Ant FWS : Post FWS = 3:1
75
Q

VDO (summary)**

A 
• Occlusal position
• During swallow
• Determined by:
1. pre-extraction records
2. old dentures
3. phonetics (Closest Speaking Space)
4. neuromuscular memory
5. swallow
6. inter-ridge distance (12mm minimum)
7. when the ridges are parallel to one another
8. VDR (VDR-FWS=VDO)
76
Q

Consequences of Insufficient VDO**

A
  • Angular chelitis
  • Possible loss of some muscle tone
  • Possible hearing problem/tinnitus
  • Some loss of chewing efficiency
  • Esthetic problems
77
Q

Consequences of Excessive VDO**

A
  • ↑ Ridge Resorption
  • Facial muscle strain
  • Possible TMD
  • Trouble with speech
  • Clicking of teeth during speech
  • Trouble swallowing
  • Esthetic problems
  • Sore ridges
  • Sore muscles
78
Q

______ (Insufficient/Excessive) VDO causes bone loss!

A

Excessive VDO

79
Q

Which is better… worse…?
Insufficient VDO
or
Excessive VDO

A
  • Better: Insufficient VDO

- Worse: Excessive VDO (causes bone loss)

Remo (6 decks)

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