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Remo > CH5: FB & CR > Flashcards

CH5: FB & CR Flashcards

1
Q

A faulty occlusal plane upsets the equilibrium between

the tongue and the ______muscles

A

buccinators muscles

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2
Q

Occlusal Plane Too low:

A
  • “Denture look” or reverse smile

* Could lead to tongue and cheek biting

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3
Q

Occlusal Plane Too high:

A

• The tongue will not be able to rest on the lingual cusps of the lower
posterior teeth to prevent displacement
• The tongue will be raised up and thus raise up the floor of the mouth
allowing for partial loss of border seal
• Greater accumulation of food in the sulci

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4
Q

Function of area “A”

A

esthetic & speech

NOT functional demands

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5
Q

When viewed from the front, the occlusal plane

should be parallel to the ____ (plane/line)

A

interpupillary line

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6
Q

The _____ is the most controversial landmark in

occlusal plane orientation.

A

ala-tragus line

However, this extra-oral landmark is reliable as both
its ends do not change with age.

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7
Q

location of the condyle?

A

11 to 13 mm
anterior to the posterior border of
the tragus
on the tragus-canthus line

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8
Q

limit of negligible error for location of condyle

A

6mm radius (+/-3 mm)

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9
Q

Arbitrary hinge position

A

11-13 mm forward of tragus on the tragus-canthus line

i.e location of the condyle

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10
Q

Thus facebow permits
an ↑ or ↓ VDO of ___mm using
the original articulator
FB & CR mounting

A

3mm

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11
Q

If a Facebow is used __ mm of mand path can be predicted

A

6mm

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12
Q

If a Facebow is used __ mm of path can be predicted at ↑in VDO

A

3mm

same for ↓ VDO

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13
Q

VDO can be changed on the articulator.

T/F

A

T
(during tooth try-in or
clinical remount,
if needed)

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14
Q

Transverse Horizontal Axis of FB: An imaginary line around which the mandible may rotate
within the _______ plane

A

sagittal plane

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15
Q

Facebow

A 
Transfers the position of the maxilla in relation to
the condyle (transverse horizontal axis) and
the reference plane (based on the third point of reference)
Orientation of the incisal plane in relation to inter-pupillary line
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16
Q

problem with using simple hinge articulator

A

-puts the hinge in the wrong position in relation to the
maxillary plane – and thereby the axis of rotation.
-Mounted cases will have a different arc of closure
resulting in
-greater adjustments after insertion

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17
Q

MIP or Maximal Intercuspal Position:

A

complete intercuspation of the opposing teeth

independent of condylar position

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18
Q

MIP=best fit of the teeth regardless of the condylar position.
T/F

A

T

19
Q

In Complete Dentures,

We need a maxillomandibular relation that is:

A
  • Independent of tooth contact
  • Clinically discernable
  • Clinically reproducible
20
Q

CR

A

the Maxillomandibular relationship in which the condyles articulate with
the thinnest avascular portion of their respective disks with the complex
in the anterior-superior position against the shapes of the articular
eminencies.

21
Q

CR depends on tooth contact.

T/F

A

F

CR is independent of tooth contact.

22
Q

CR is clinically discernible when the mandible is directed ___ and
___.

A

superior and anteriorly

23
Q

It is restricted to a purely ___ movement about the

_____ axis.

A

It is restricted to a purely rotary movement about the

transverse horizontal axis.

24
Q

In Edentulous patients MIP ≠ CR.

T/F

A

F.

Edentulous pts. MIP must = CR

25
Q

In dentate patients MIP ≠ CR.

T/F

A

T

26
Q

In edentulous pts., first contact must be _______

A

In edentulous pts., first contact must be maximum contact

27
Q 
Edentulous:
If there is a
tooth out of
place it will
cause the
\_\_\_\_\_\_\_\_\_ (denture or teeth /jaw) to
move
A

Denture

28
Q 
Dentate:
If there is a
tooth out of
place it will
cause the
\_\_\_\_\_\_\_\_\_ (denture or teeth /jaw) to
move
A

Jaw

29
Q

Consequences of MIP ≠ CR in CD pts.

A

1) denture will move, causing bone loss,

2) or the jaw will move, causing joint wear

30
Q

CR is recorded ____ (before/after) rims adjusted and VDO has been established

A

after

31
Q

Pure rotation (CR) is a function of _____

A

degree of opening (VDO)

32
Q

The closer the jaws are to VDO, the less likely they will _______

A

translate

33
Q

During Interocclusal Records - ____ must precede CR

A

VDO

34
Q

After cutting a step in the mandibular rims, ___ & ___ are the only areas in contact now to maintain VDO

A

Areas A & B are the only areas in contact now to maintain VDO

35
Q

Aluwax should sit _____ mm above lower rim

A

1-2 mm

36
Q

Purpose of notches on casts

A

Notches required
for repositioning
casts on articulator
after processing

37
Q

Set the pin to ___ before mounting FB registration

A

ZERO

38
Q

A ~_____mm space must be left.

The rims must not touch at the end of the CR record

A

0.5-1 mm

39
Q

CR Registration Error Causing

Anterior Open Contact:

A
  • Record Bases may slip or lift during bite registration
  • Record Bases are touching @ the heels
  • Record Bases may tilt (anterior or posterior)
  • Tongue can push out lower Record Base
40
Q

Preventing errors during CR

A

• Stabilize the lower base during bite registration
• Adjust the record bases with a bur so they do not touch
during bite registration (heel interference!) – repeat CR
• Practice/rehearse CR first
• Use your guidelines (midline & canine lines) as a reference

41
Q

While restoring rims after mounting, Do not touch areas _____

A

A & B

42
Q

While restoring rims after mounting, why do we not touch areas A & B

A

They are holding your VDO (@36mm)

43
Q

Completed Rims Guidelines:

A

U/L rims in FLUSH (and FLAT) contact at VDO = 36mm
A= 19mm
B= 17mm
C= 1/2 RMP

Remo (6 decks)

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