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Prosthesis > Articulators > Flashcards

Articulators Flashcards

1
Q

What is an articulator?

A

mechanical device representing the jaw members and the TMJ to which the maxillary and mandibular casts are attached to simulate different mandibular movements

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2
Q

What are the mandibular movements?

A
  • opening and closing
  • protrusive
  • right and left
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3
Q

What is the sagittal (horizontal) condylar path?

A

path travelled by the condyles during protrusive movement (downward + forward)

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4
Q

What is the lateral condylar path?

A

path travelled by the condyles during lateral movement (downward + forward + medial)

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5
Q

What are the articulator movements?

A
  • opening and closing
  • protrusive
  • right and left
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6
Q

What are the functions of the articulator?

A
  • act as a patient in the absence of the patient
  • simulate, but not duplicate, all possible mandibular movements
  • diagnosis and treatment planning (to observe all possible movements)
  • arrangement of artificial teeth for complete dentures and removable partial dentures
  • fabrication of occlusal surface for dental restorations
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7
Q

What are the advantages of articulators?

A
  • visualisation of occlusion (lingual aspect)
  • no need for patient cooperation
  • decrease chair time and patient appointment
  • patient’s saliva, tongue and cheek are not factors when using an articulator
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8
Q

According to records accepted, articulators are classified into…

A
  • simple hinge articulators
  • mean value (fixed condylar path) articulators
  • adjustable articulators (semi and fully adjustable)
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9
Q

Is Bonwill triangle accurate?

A

No

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10
Q

Is maxillary facebow accurate?

A

Yes

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11
Q

What does Arcon stand for?

A

Articulator condyle on normal

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12
Q

What are the movements and records taken from the patient for a simple hinge articulator?

A

movements
- opening and closing
records taken from patient
- centric occluding relation

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13
Q

What is centric occluding relation?

A

centric relation + proper vertical occlusal dimension

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14
Q

What is the movement of articulator on protrusive movement?

A

Upward and backward

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15
Q

Does the mandible move in the articulator?

A

No

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16
Q

What are the movements of mean value articulators?

A
  • opening and closing
  • protrusive (fixed 30-40 degrees)
  • lateral (fixed 12-20 degrees)
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17
Q

What are the records taken for mean value articulators?

A

to mount the upper cast
- Bonwill triangle (ASA)
- facebow record )AlMahdy articulators only)
to mount the lower cast
- centric relation

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18
Q

Is the incisal angle and table fixed in mean value articulators?

A

Yes, 30 degrees incisal angle

19
Q

Are all mean value articulators Arcon?

A

No

20
Q

Is the intercondylar distance fixed in mean value articulators?

A

Yes

21
Q

What are the two types of semi-adjustable articulators?

A
  • Hanau
  • Whip mix
22
Q

What are the movements of semi-adjustable articulators?

A
  • opening and closing
  • protrusive (taken from patient)
  • lateral (Hanau’s equation with Hanau’s articulator or taken from patient with Whip mix articulator)
23
Q

What are the records taken using semi-adjustable articulators?

A

to mount the upper cast
- Bonwill triangle (unlikely)
- maxillary facebow for all designs
to mount lower cast
- centric relation

24
Q

How to record protrusive movement of semi-adjustable articulators?

A

taken from patient and adjusting horizontal condylar guidance

25
Q

How to record lateral movement of semi-adjustable articulators?

A

adjusting lateral condylar guidance using either Hanau’s equation or taken from the patient using Whip mix articulator

26
Q

What is Hanau’s equation?

A

L = H/8 + 12

27
Q

How to record lateral movement through Whip mix articulator?

A

taken from patient
- right record to adjust left lateral condylar guidance
- left record to adjust right condylar guidance

28
Q

Is Hanau articulator Arcon?

A

no

29
Q

Is Whip mix articulator Arcon?

A

yes

30
Q

Is the incisal table and angle fixed in semi-adjustable articulators?

A

no

31
Q

Is the intercondylar distance fixed in semi-adjustable articulators?

A

yes

32
Q

What are the movements of fully-adjustable articulator?

A
  • opening and closing
  • protrusive (obtained from patient)
  • lateral (taken from patient)
33
Q

What is the name of a fully-adjustable articulator?

A

Denar

34
Q

What are the records taken for a fully-adjustable articulator?

A

to mount upper cast
- facebow
to mount the lower cast
- centric relation

35
Q

How is protrusive records taken for fully-adjustable articulator?

A

from patient to adjust horizontal condylar guidance

36
Q

How is lateral records taken for fully-adjustable articulator?

A

taken from patient
- right record to adjust left lateral condylar guidance
- left record to adjust right condylar guidance
it records path of condyle from the beginning of movement to the end of the movement

37
Q

Is the incisal angle and table fixed in fully-adjustable articulators?

A

no

38
Q

Are fully-adjustable articulators all Arcon?

A

yes

39
Q

Is the intercondylar distance of fully-adjustable articulators fixed?

A

no

40
Q

What are the minimal requirements of articulators?

A
  • maintain correct horizontal and vertical relationships of patient’s cast
  • casts must be easily removed and attached to the articulator
  • have an incisal guide pin with a positive stop to preserve patient’s vertical dimensions
  • open and close in a hinge-like fashion
  • accurate, rigid and of non-corrosive materials
  • moving parts resist water
  • adjustment should be able to move freely and be definitely secured
41
Q

What are some additional requirements for articulators?

A

if the denture is fabricated with balanced occlusion (3 points of contact in centric and eccentric), the articulator should…
- accept facebow
- allow protrusive and lateral movements
- have adjustable incisal guidance

42
Q

Do all semi-adjustable articulators accept facebow records?

A

yes

43
Q

Can fully-adjustable articulators be linked to a computer using a software?

A

yes

Prosthesis (7 decks)

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