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Removable Pros > Facebow and CR > Flashcards

Facebow and CR Flashcards

1
Q

purpose of facebow?

A

transfer functional components from patient to articulator efficiently, but also esthetic component

from occlusal and esthetic standpoint- the more closely the models translate the function, the less occlusal adjustment we’ll have to do when we take the restoration back to the mouth

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2
Q

can we find exact location of condyle?

A

maybe but we are using an anatomical average

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3
Q

anatomical average of condyle location

A

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

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4
Q

limit for negligable error when taking facebow

A

6mm

+/- 3 mm radius of the actual condylar location

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5
Q

two circles and what they represent and mean

A

one if we found the exact center
one if we estimated and used arbitrary point

at 2 points on the circle, the paths will cross and be identical

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6
Q

what does faceboq permit for VDO measurement?

A

+3mm or - 3mm (increase or decrease)

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7
Q

bring trial to patient but it is not fitting, problems with VDO. how much can you change it?

A

+ / - 3mm in either direction - as this is permitted by the articulator when taking facebow and CR

close it down 3mm or open it 3mm

WITHOUT RE-MOUNTING

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8
Q

what happens if we open more than 3mm on the patient?

A

CANT - Pt. will start to go into TRANSLATION

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9
Q

if the path can be predicted what else can be predicted?

A
  1. position of the mandible
  2. position of mandible at increased VDO
  3. mandibualr position at decreased VDO
  4. occlusal contacts can be predicted
  5. occlusal contacts at increased or decreased VDO
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10
Q

can VDO be changed on the articulator?

A

yes - during tooth try-in or clinical remount, if needed

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11
Q

transverse horizontal axis

A

an imaginary line around which the mandible may rotate within the sagittal plane

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12
Q

axis orbital plane is the?

A

the horizontal plane established by the transverse horizontal axis of the mandible with a point on the inferior border of the bony orbit
*used as horizontal reference point

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13
Q

orientation of the incisal plane in relation to the inter-pupillary line?

A

parallel

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14
Q

what does the facebow do?

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)

allows us to alter the vertical dimension (+/-3) with negligible error

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15
Q

how does the facebow orient the dental cast?

A

in the SAME RELATIONSHIP TO OPENING AXIS OF THE ARTICULATOR

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16
Q

implication of using a simple hinge articulator

A

yoou are “guesstimating” without a facebow which puts the hinge in the wrong position in relation to the maxillary plane – which also alters the axis of rotation
mounted casts will have a different arc of closure and the AXIS OF ROTATION IS SIGNIFICANTLY HIGHER

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17
Q

MIP

A

Intercuspation of opposing teeth
INDEPENDENT of condylar position
‘best fit of teeth’

18
Q

occlusion/ Maxo-mandibular relation we need in complete denture?

A

INDEPENDENT of tooth contact
clinically discernable
clinically reproducible

AKA
CENTRIS RELATION

19
Q

Centric Relation

A

condyles articulate in THINNEST portion of respective disks in the ANTERIOR-SUPERIOR position against eminence. INDEPENDENT of tooth contacts
clinically discernable
PURE ROTATION ABOUT TRANSVERSE HORIZONTAL AXIS

20
Q

Relationship between MIP and CR in complete denture?

A

MIP=CR

21
Q

what happens if MIP does not equal CR in complete dentures?

A

The denture will move, causing BONE LOSS, or the jaw will move, causing JOINT WEAR

22
Q

what controls the path of mandible in natural dentition

A

the inclines

23
Q

what controls the path of mandible in artificial dentition?

A

HINGE controls the path

because we set our teeth to compliment this

24
Q

first contact in edentulous?

A

must be the MAXIMUM CONTACT

25
Q

Tooth out of place in edentulous patient?

A

it will contact and cause the denture to move out of place

the mandibular path must be reproduced by teeth and hinge simulataneously
CO=CR

26
Q

tooth out of place in dentate patient?

A

it will cause the jaw to move and may not be symptamatic for patient (or could be)

27
Q

during centric relation record IN slc describe hand placement

A

the fingers are on THE BUCCAL SHELF so it doesnt move move and the thumbs are BELOW the mandible
need to stabilize lower RB while take CR record

28
Q

when do we record CR for complete dentures?

A

AFTER rims are adjusted and VDO has been established

29
Q

vertical when CR is recorded?

A

CR is always recorded at a slightly open vertical
like closest speaking space
about .5 mm

30
Q

what maintains VDO during bite registration

A

A and B must maintain it

31
Q

what maintains VDO during tooth set up?

A

C and D

32
Q

what limits the chance of pt. going into translation during capture of CR?

A

Having the jaws close to VDO

33
Q

where do you cut a notch? shape?

A

Diagonal notch cut into area D

cut on an angle so it locks into place

34
Q

where do you cut a step? size/ shape?

A

1mm STEP in area C

35
Q

which rim do you lubricate when taking CR?

A

Maxillary Rim

36
Q

Aluwax - for what - how use it? placement

A

Fan fold 2/3 times with a warm knife and will go in area of where you created the step in area C

1-2 mm above area C because this is what we need to engage the notch that we made in area D

37
Q

majority of problems in tooth try in or insertion of denture involve?

A

anterior open bites

38
Q

how do you get anterior open bites from CR registration? AKA what errors occur during CR that result in anterior open bite

A
  1. record bases may slip or lift during bite registration
  2. Record bases are touching
  3. record bases may tilt (anterior or posterior)
  4. Tongue can push out lower Record Base
39
Q

how to prevent CR registration mishaps

A
  1. Stabalize the lower tray during bite registration
  2. Adjust the record bases with a bur so they do not touch during bite registration (heel interference)
  3. Practice /test CR first
40
Q

where is pin when mounting lower cast

A

zero

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