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Remo > CH4: VDO > Flashcards

CH4: VDO Flashcards

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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
The rims must be flush to maintain ___
VDO
26
What is VDO
Vertical Dimension of Occlusion | – during Occlusal Contact
27
What is VDR ?
VDR = Vertical Dimension of Rest | – during Muscular Rest
28
____(Anterior/Posterior) teeth hold the VDO
Posterior
29
``` When natural teeth are in occlusion, ridge crests are approximately a minimum of _____mm apart in the anterior ```
12 mm (Or: The height of a tongue blade – (Anterior) +)
30
Minimum Inter-ridge Space: Anterior
12 mm
31
Minimum Inter-ridge Space: Anterior wrt tongue blade
The height of a tongue | blade
32
Minimum Inter-ridge Space: Posterior wrt tongue blade
The thickness of a | tongue blade
33
Minimum Inter-ridge Space: Posterior
1-2 mm
34
Freeway Space
The Freeway Space is the space | between the teeth when the mandible is at rest (VDR)
35
____ (VDO/VDR) occurs during swallowing
VDO
36
___ (VDO/VDR) occurs at the end of swallowing
VDR
37
___ (VDO/VDR) occurs at the end of the “Emma” sound
VDR
38
The mandible moves _____ (downward/upward) from VDR to VDO traveling a distance of about _____ mm
- upward | - 2-3 mm
39
The Freeway Space has an Anterior/Posterior ratio of ___
Freeway Space has an Anterior/Posterior ratio of 3:1
40
Freeway Space increases with age – Averages ~____ mm
~2-3 mm
41
FWS calculation
FWS = VDR -VDO | Avg ~3mm
42
Free way space is ____ mm
2-3 mm
43
Closest Speaking Space
The Closest Speaking Space is the small space | between the occlusal surfaces during sibilant sounds
44
sibilant sounds
1) "S" sounds (Mississippi, 66, "s") 2) “ch” – church, Massachusetts,sandwich 3) “j” – jelly, judge 4) “Z”
45
Teeth ____(should/should not) contact during sibilant “S” sounds
Teeth should NOT contact during sibilant “S” sounds
46
What results in clicking during sibilant sounds
Upper and lower tooth contact. Teeth should not contact during sibilant “S” sounds or “clicking” of the teeth together will result
47
Clicking of teeth is NOT normal when VDO is correct. | T/F
T Clicking of teeth is NOT normal when VDO is correct, even if the patient is wearing porcelain teeth
48
“S” sound determines:
* Incisor position * Premolar position * VDO
49
Closest speaking space is about ____mm
0.5-1 mm
50
Neutral Zone
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
The denture teeth should be positioned in the ______ zone so the dentures remain in equilibrium
Neutral Zone
52
Space of Donders
Space of Donders is the space between the palate & tongue during VDR.
53
Space of Donders is the space between the palate & tongue during ____ (VDO/VDR).
VDR
54
↑VDO → _____(↓/↑)Space of Donders
↑VDO → ↑Space of Donders
55
↓VDO → _____(↓/↑)Space of Donders
↓VDO → ↓Space of Donders
56
Independent of VDO… if the palate is too THICK, ______ will be decreased and the patient will have trouble swallowing
Space of Donders
57
Ant-post guidelines for anterior teeth:
* Lip support * Naso-labial Fold * Vermillion border of the lip * Fricatives
58
Incisal-occlusal plane orientation guidelines:
* 1/2 -2/3 RMP | * Inter-pupillary Line
59
Area A functions
* Esthetics * Lip support * “F” sound * Inter-pupillary line
60
Area B functions
* VDO adjust | * “S” sound
61
Area C functions
Retromolar pad
62
Area D functions
* VDO adjust | * “S” sound
63
What areas may not be altered to change VDO?
areas “A” and “C” “A” = Esthetics + Phonetics “C” = Anatomy of Retromolar Pad
64
What areas determine the Occlusal Plane?
areas “A” and “C”
65
What areas determine VDO?
“A” + “B” and “C” + “D”
66
What areas may be altered to | change VDO?
areas “B ” and “D” ``` “B” = Sibilants with “A” “D” = Sibilants with “C” ```
67
Sibilant areas
``` “B” = Sibilants with “A” “D” = Sibilants with “C” ```
68
If rims not flush, ____ area is changed and this raises the plane from the ala-tragus line
D
69
2/3 Retromolar Pad is used for ______(Curved/Flat) Occlusal Planes
Flat
70
1/2 Retromolar Pad is used for ______(Curved/Flat) Occlusal Planes
Curved
71
VDO & Plane are changed by tapering the rims | T/F
T. VDO & Plane are changed by tapering the rims (by adding or removing a wedge of wax).
72
Does changing the VDO | always change the plane? (y/n)
Y Changing the VDO ALWAYS changes the plane
73
Does changing the plane | always change the VDO? (y/n)
No. Changing the plane doesn't always change the VDO
74
VDR (summary)**
* 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
VDO (summary)**
``` • 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
Consequences of Insufficient VDO**
* Angular chelitis * Possible loss of some muscle tone * Possible hearing problem/tinnitus * Some loss of chewing efficiency * Esthetic problems
77
Consequences of Excessive VDO**
* ↑ Ridge Resorption * Facial muscle strain * Possible TMD * Trouble with speech * Clicking of teeth during speech * Trouble swallowing * Esthetic problems * Sore ridges * Sore muscles
78
______ (Insufficient/Excessive) VDO causes bone loss!
Excessive VDO
79
Which is better… worse…? Insufficient VDO or Excessive VDO
- Better: Insufficient VDO | - Worse: Excessive VDO (causes bone loss)

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