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Dentistry Module 7 > Fixed Prosthodontics > Flashcards

Fixed Prosthodontics Flashcards

1
Q

Why may a face bow record be required?

A

To allow casts to be mounted on a semi pr fully adjustable articulator

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2
Q

Why is a semi-adjustable articulator required for face-bow recording? Give two main reasons.

A
  1. To allow the relationship of the casts to be visualised in a number of functional positions during the planning stage of treatment.
  2. To allow the relationship to be reorganised by the waxing up or fabrication of restorations.
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3
Q

Define a confirmative relationship.

A

Same occlusion before and after placement of a restoration.

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4
Q

What does a face bow record?

A

The relationship of the maxillary teeth to the condylar head in a retruded position (i.e. a posterior superior position)

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5
Q

Why are there indentations on the bite fork component of a face bow recording?

A

This is for mechanical retention of the wax onto the bite-fork

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6
Q

What are the 4 types of articulators?

A
  1. Simple hinge (e.g. plane line)
  2. Average value (e.g. free plane)
  3. Semi-adjustable (e.g. denar or dentatus)
  4. Fully adjustable
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7
Q

What articulator is described:
1. equivalent to holding casts in your hand
2. Occlusal relationship only correct when casts are together

A

Simple hinge articulator

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8
Q

What articulator is described:
1. Sufficiently accurate for reproducing ICP
2. Suitable for posterior restorations where there is guidance from other teeth
3. Suitable for a complete removable prosthesis

A

Average value articulator

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9
Q

What articulator is described:
1. Mandibular condyle (arcon)
2. Used for fixed pros
3. Multiple units
4. Reorganised occlusion

A

Denar semi-adjustable articulator

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10
Q

What articulator is described?:
1. Maxillary condyle (non arcon)
2. Used for rem pros
3. Multiple units
4. Re-organised occlusion

A

Dentatus semi-adjustable articulator

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11
Q

Define the terminal hinge axis.

A

An axis through both condyles when they are in most superior and posterior unstrained position in the glenoid fossa.

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12
Q

As part of a facebow recording, what does the bite-fork record?

A

The position of the teeth

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13
Q

As part of a facebow recording, what does the bow record?

A

The position of the condyle

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14
Q

What 4 factors MUST be determined prior to preparing teeth for laboratory fabricated restorations?

A
  1. Pain from TMD
  2. Unexplained facial pain
  3. Chronic dental pain
  4. Discomfort from mobile teeth
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15
Q

What 3 ways can the “comfortable closed position where the maximum number of natural teeth meet.” Be addressed?

A
  1. ICP
  2. Centric occlusion (CO)
  3. Maximum intercuspation
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16
Q

In the case of a complete denture case, what position can be used where there is memory of the ICP from when natural teeth remained?

A

Muscular position

17
Q

What are the 5 different terms used for a retruded position? Not all of these terms mean that the retruded position has tooth contact.

A
  1. Centric relation (CR)
  2. RCP
  3. Ligamentous position
  4. Centric relation contact position (CRCP)
  5. Retruded axis position (RAP)
18
Q

Define, “a maxillomandibular relationship, independent of tooth contact, in which the condyles articulate in the anterior-superior position against the posterior slopes of the articular eminences.”

A

Centric relation

19
Q

Why is centric relation important clinically?

A

It is a repeatable, unstrained, physiological maxillomandibular relationship where the patient can make vertical, lateral or protrusive movements.

20
Q

Define, “when the condyle is in its most superior, anterior position within the glenoid fossa (terminal hinge axis position) and the mandible is elevated.”

A

Retruded position

21
Q

How many mm is the anterior slide from RCP to ICP?

A

1-2mm

22
Q

If a patient has a class 1 incisal relationship what would you expect to see in regards to incisal movement upon protrusive excursion?

A

If mandible slides forward, incisors and canines should guide mandible forward.

23
Q

If a patient has a class 2 div 2 incisal relationship what would you expect to see in regards to incisal movement upon protrusive excursion?

A

An increased overbite, when the patient tries to slide forward they will just hinge open.

24
Q

If a patient has a class 2 div 1 incisal relationship what would you expect to see in regards to incisal movement upon protrusive excursion?

A

When the mandible slides forward, it is the posterior teeth instead of the anterior guiding the movement.

25
Q

Why is it advantageous to smear Alginate on occlusal surfaces of teeth when taking impressions for fixed pros?

A

It will aim to avoid air blows which will give excess amount of stone on cast which could alter occlusion.

26
Q

When upper anterior fixed restorations involves palatal morphology, what is advantageous to do?

A

Customise the incisal guidance table

27
Q

How is a customised anterior guidance table recorded?

A

Movement of pin as it rises of table is recorded using a cold cure acrylic

28
Q

Why is recording an anterior guidnace table so important when making fixed restorations such as anterior crowns?

A

Because it is the only record of pre-existing guidance, this mist be copied when the shape of the crowns is developed by the technician.

29
Q

Describe the three main steps to fabrication of an indirect restoration incorporating a removable prosthesis.

A
  1. design the denture until special tray stage
  2. Prepare the tooth for the indirect restoration plus additional prep for the rest seat
  3. Prescribe to lab with words diagrams and verbal instructions
30
Q

Roughy how long should a set of dentures last and why?

A

Around 3-5 years, because of physiological resorption of edentulous areas

31
Q

In what % of the population is ICP coincident with RCP?

A

10%

32
Q

In what % of the population is ICP 1mm anterior to RCP?

A

90%

33
Q

What is the major muscle that pulls back the mandible when going into RCP?

A

Genioglossus

34
Q

Define, the bilateral simultaneous occlusal contact of the anterior and posterior teeth in excursive movement.

A

Balanced articulation

35
Q

What is the Daal approach for tooth wear in natural dentition to try and establish an appropriate FWS?

A

Where teeth with tooth wear are built up so that FWS is 0mm, expect to find that the FWS re-establishes itself.

36
Q

What articulator is used if a face bow recording is to be taken for making a removable prosthesis?

A

Dentatus semi-adjustable articulator

Dentistry Module 7 (14 decks)

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