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Occlusion > Facebow > Flashcards

Facebow Flashcards

1
Q

what is on the right side of the ear bow?

A

ANTERIOR REFERENCE POINTER will go up and down in vertical in order to align this to the point

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2
Q

metal in the holes

A

beveled

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3
Q

what do you need make sure the screw holes are…

A

PATENT - meaning unscrew enough

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4
Q

PATENT

A

can see the beveled edge

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5
Q

midline notch

A

located on the bitefork - so you can align it with the patients midline given by location of maxillary central incisors

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6
Q

where does the midline notch face?

A

ALWAYS SUPERIORLY - could use towards ceiling, faces incisal edges of the maxillary anteriors, upwards

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7
Q

what are the holes for in the bitefork?

A

RETENTION

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8
Q

what is the wax substituting?

A

PVS - these are expensive inject-able materials

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9
Q

TJA aka

A

transfer jig assembly

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10
Q

TJA parts

A

basically has three parts

1. vertical rod or shaft of transfer jog assembly

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11
Q

where does the vertical rod/ shaft go?

A

through hole number one on the TJA (transfer jig assembly)

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12
Q

parts of the vertical rod and how to adjust

A

screw to the right of it - has superior and inferior portions -

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13
Q

top and bottom cm of the vertical shaft/ rod

A

ARE BEVELED - flat side faces the patient

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14
Q

flat ends of vertical rod are placed?

A

towards the patient

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15
Q

what is hole number 2 for?

A

insertion point for the bitefork

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16
Q

which screw controls the bitfork

A

below the number two

- screw number 2

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17
Q

what goes on superior part of beveled rod?

A

Earbow

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18
Q

What goes on the inferior aspect of the beveled rod?

A

transfer jig incisal table

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19
Q

transfer jig table

A

replaces the white one that came with the articulator

  • for the purpose of doing the transfer of the facebow of articulator of the MAXILLARY
  • also has a beveled hole with screw that needs to be patent
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20
Q

which way does the thumb screw on the transfer jig table face?

A

YOU

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21
Q

where does the attachment screw on the transfer jig table face?

A

the floor

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22
Q

why are the screw holes beveled?

A

fit with the flat portions (that face the patient) on the vertical shaft/rod

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23
Q

where does the transfer jig incisal table go

A

onto the inferior aspect of the vertical rod /shaft

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24
Q

slope of the bitefork AKA

A

inclination or CANT of it

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25
Q

where is the patent open hole on the earbow?

A

underside of it

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26
Q

what attaches to the superior aspect of the rod

A

the beveled hole on the underside of the earbow

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27
Q

2 screws on ear bow and what they do

A

one tightens the ear buds that go into the internal acoustic meatus
the other tightens the ear bow to the superior aspect of the vertical rod

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28
Q

reference plane locator

A

the thin plastic ruler

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29
Q

anterior reference pointer

A

on the right side of the ear bow

- will go underneath the patients right eye

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30
Q

how many points in the maxillary spatial plane?

A

three

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31
Q

what are the maxillary spatial plane points

A

three
two of them are given by the location of the left and right external auditory meatus (opening of the left and right ear) - these are posterior

3rd = the anterior reference point

32
Q

anterior reference point

A

part of the maxillary spatial plane and goes near the infraorbital part of the right eye ball - made with marker and the anterior reference plane locator

33
Q

anterior reference pointer will align with what?

A

the anterior reference point - which is created with the anterior reference plane locator

34
Q

to take ear bow off?

sequence

A

first release from patients ear - loosen the LARGE screw in the front

  1. retract pointer
  2. loosen the ear
  3. then screw IN FRONT to detach the ear bow from the rod
35
Q

cleaning ear bow

A

cold sterile wipes

36
Q

how does the bitefork go in and out?

A

IN - through posterior so the conical end will face you through hole number 2

OUT - loosen thumb screw beneath hole number 2

37
Q

locating the anterior reference point of the spatial plane

A

anterior reference plane locator (ruler) and red marker

38
Q

describe the reference plane locator

A

flat edge of notch / 90 degrees

pointy end - goes on the patients epidermis (skin)

39
Q

what tooth and where does the reference plane locator go?

A

flat side/ 90 degrees with the incisal edge of tooth number 7 - MAXILLARY RIGHT LATERAL INCISOR
pointy part on the skin and put dot where this goes

40
Q

dont have a maxillary right lateral incisor?

A

incisal embrasure between canine and central

41
Q

what does the anterior reference plan locator approximate?

A

an average distance of 43 millimeters of the average location of an average healthy dentate adult from the incisal edge of tooth number 7 to area (superior/ above the incisal edge) and approximates the location of the infraorbital notch on the right

42
Q

what does patient need to do when taking the anterior reference point?

A

NO SMILE - any distortion to the epidermis will also offset this mark

43
Q

wax bitefork registration

A

what you take with the facebow apparatus and the TJA with bitefork assembeled

44
Q

place wax in water bath T/F

A

true - at 160 degrees and gets soft

45
Q

folding of wax

A

tri fold
take 1/3 and fold it onto itself
- place onto bitefork WITHOUT covering the notch and fold excess underneath

46
Q

placement of bitefork

A

place in like alginate and push in then ask to bite down and pierce lips
temporalis and massater to tighten the bite

47
Q

after put bitefork in

steps of setting up ear bow

A
  1. add the TJA with a preliminary tightening of screw two to hole two
  2. add the ear bow - attach to the superior rod by loosening screw 1 - locate external auditory meatus - then tighten
    add the ear bow to the suprior aspect and tighten ear bow screw
  3. loosen the right anterior reference pointer and align it
    then tighten 1 and 2 screw when in line with the red dot
48
Q

earbow is parallel to?

A

interpupillary line - if not skewed facebow

49
Q

verticality of point is given by?

A

the anterior reference pointer on the right side of war bow

50
Q

the lateralness of the accuracy of the three points on a plane is given by

A

given by screw number 2

51
Q

to disassmble from patient?

A
  1. retract reference pointer and tighten
  2. loosen big round screw to loosen earbow
  3. grasp hole transfer jig assembly
52
Q

once off the patient what should you do?

A

do a final tightening and HOLD FROM THE BOTTOM / TABLE

53
Q

after take bite registration what do you have? *

A

relationship between bitefork and vertical shaft - anatomical spatial information of the patients maxillary spacial plane

54
Q

attachment of the facebow is to what?

A

the LOWER BOW OF ARTICULATOR

55
Q

plaster mount of cookie

A

for retention - have to smear the plaster in there

56
Q

do you transfer with the ear bow?

A

no

57
Q

Facebow transfer step

A
  1. loosen screw on underside of the transfer jig table - slide onto the lower bow
  2. add t-magnetic cast support
  3. align the upper cast to the bitefork
58
Q

how to prevent movement of the bitefork when add weight of plaster?

A

T-shaped magnetic cast support - keep the rubber part at the bottom on - raise up the T until it reaches the underside of the bitefork and tighten both screws

59
Q

does the cast need to be centered on the articulator

A

NO - this is a patients actual anatomical position and set up - so doesnt matter if it is not right underneath the cookie

60
Q

slope of the arch?

A

ANTERIO-INFERIOR

61
Q

technique for plaster

A 
double plster mix technique with blob and smear 
vertical blob on the top of the cast 
engage notches with plaster 
move it around 
hand has not left upper bow
62
Q

where must plaster go

A

into the undercuts of cookie

63
Q

plaster mounting

A

filling notches and contouring

keeping pressure on upper bow

64
Q

after first mixing

A

separate upper with plaster and cast from the bitefork and then separate the cast with cookie from the articulator - do not just pull - torque sideways - check if fill notches now do second mix to fill in any voids with fingers where needed - find notches especially then and make pretty with moist toothebrush and sand paper

65
Q

1 most important tool to study and restore a patients occlusion?

A

A semi-adjustable articulator

66
Q

advantages of articulator for diagnosis

A

Improves visualization of both static and functional tooth contacts (ability to see patients movements)

restorations fit occlusal requirements

less intraoral adjustments

67
Q

what is our articulator called?

A

Mark 320 Semi-adjustable articulator

68
Q

where is our artiulator adjustable?

A

adjustable in protrusive (0-60 degrees)
ADJUSTABLE CONDYLAR INCLINATION
- 30 degrees for entire year
- adjusting the left and right inclination of the condyles when they move in a protrusive – forward right and left

69
Q

fixed (permanent) measurement on our articulator

A

FIXED INTERCONDYLAR DISTANCE

fixed bennet angle or side shift is permenately set to 15 degrees which is ‘average healthy human’ number

70
Q

arcon articulators - guidance of the condylar movement in the _____ member

A

MAXILLARY

non arcon = mandibular

71
Q

semi adjustable are only accurate for excursions if?

A

a facebow transfer is used

72
Q

facebow transfer relates?

A

HINGE axis to maxilla

73
Q

facebow registration

A

this registration relates the maxillary arch to the horizontal hinge axis of the patient

*in semi-adjustable the “ARBITRARY HINGE AXIS” is used – which is determined by the manufacturer of facebow and articulator system

74
Q

average distance from ear to the hinge axis?

A

10-13 mm

75
Q

arbitrary hinge axis

A

located with the help of the denar ruler

based upon the average location as determined by the manufacturer

Occlusion (10 decks)

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