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Yr 3 Restorative - Prosthetics COPY > Quizzes > Flashcards

Quizzes Flashcards

1
Q

What actions should be undertaken at the jaw registration stage during partial denture construction?

A

The centric jaw relation
Lip support and other muscular support
Mould and shade of teeth
The occlusal rim surfaces to conform to the patients existing occlusion and dentition

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2
Q

What is the definition of ‘centric jaw relation’?

A

The relation of the mandible to the maxilla which the mandible in its most retruded position
Also known as retruded jaw relation and retruded contact position

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3
Q

What is the retruded arc of closure?

A

The arc described by any point on the mandible during closing movement made with the condolences in their most posterior position

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4
Q

What is centric occlusion?

A

Maximal contact between opposing teeth

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5
Q

What is the freeway space?

A

The space between the maxillary and Mandibular occlusal surfaces when the mandible is in rest position

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6
Q

What is the neutral zone?

A

The space in the mouth, limited by the tongue, lips, cheeks and residual alveolar ridges, which dentures should occupy

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7
Q

What is an embrasure?

A

The space between two adjacent teeth which opens out from their contact point

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8
Q

What can be used to record bite registration?

A

Modelling wax

Impression material paste

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9
Q

What is the fox’s occlusal plane guide used for?

A

To aid carving the maxillary rim until it’s parallel to the line joining the inferior border if the aka of the nose to the midpoint of the tragus of the ear

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10
Q

What is the purpose of surveying dental casts?

A

To determine the optimum path of insertion for a proposed denture
To identify useable undercuts for clasping and unwanted undercuts so they can be blocked out

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11
Q

What is the use for the mounting table on a surveyor?

A

Where the cast sits

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12
Q

What is the vertical column of a surveyor used for?

A

Supports the double jointed arm

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13
Q

What is the double jointed arm of the surveyor used for?

A

Where the hand piece is held

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14
Q

What is the chuck of an articulate used for?

A

To secure various surveying instruments

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15
Q

What is support?

A

The mechanical function which reduces mucosal loading of a partial denture

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16
Q

What is bracing?

A

The mechanical function which prevents lateral shifting of a partial denture

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17
Q

What is bracing provided by?

A

Bracing arm, colleting and the rigid 2/3rds of the retentive clasp above the survey line

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18
Q

What is retention?

A

The mechanical function preventing displacement of a partial denture
(Flexible clasp tips)

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19
Q

Which factors may influence the possible pano of insertion of a partial denture?

A

Retention, guide surfaces, aesthetics

20
Q

What should be avoided when determining a path of insertion?

A

Interferences
Compromised appearance
Poor distribution of retentive undercuts

21
Q

What is the function of the active arm, reciprocal arm and occlusal rest if a clasp?

A

Active arm = engages undercut for direct retention
Reciprocal arm = prevents tooth movement
Occlusal rest = Distributed occlusal load through the teeth

22
Q

What length should direct retainers be at least in cm?

A

At least 1 cm

23
Q

What are the reasons for master cast duplication?

A

To produce a model that has unwanted undercuts blocked out
To produce an extra model retaining the original cast
To produce a model without wax on it used for blocking out undercuts, useful for later stages in denture making when casts need to be flashed and boiled

24
Q

What are the advantages of articulating casts in an average value articulator?

A

To be able to check the occlusion when the processed dentures are made
To assist in the construction of dentures
To be able to check the occlusion in the lingual aspect
To replicate simple jaw movements with measurements taken from a sample of the general population
To be able to study the patients lateral and protrusive movements

25
Q

What is the incisal guidance angle of the free plane average value articulator?

A

10 degrees on the horizontal plane

26
Q

What movements can the free plane average value articulator achieve?

A

Approximate condylar movements

27
Q

What is the condylar guidance angle of the free plane average value articulator?

A

30 degree

28
Q

Which articulator would you consider if there are sufficient teeth and the imtercuspal position is stable for constructing dentures?

A 
Average value 
(Simple hinge does not allow accurate articulation and are of limited value, you wouldn't use semi or full adjustable articulator said as they may over complicate the procedure)
29
Q

Which articulator would you consider if you wanted to replicate a patients jaw relationship and full path of border movements during denture construction?

A

Fully adjustable articulator (it’s the only one that allows full path of border movements to be replicated)

30
Q

How should the upper canine teeth be arranged on the occlusal rim?

A

From the labial view the canine is vertical
From the lateral view the canine is vertical
The incisal point is parallel but not quite at the same level as the occlusal plane

31
Q

How is the upper lateral incisor arranged on an occlusal rim?

A

From the labial view, the long axis is mesially inclined slightly
From the lateral vie the incisal edge is proclined forward slightly more than the central
The incisal edge is parallel to but not quite on the same level as the lower registration rim

32
Q

What is the definition of the curve if spee?

A

An arc of a circle 65 -70 mm radius that touches the tips of all the Mandibular teeth when the skull is viewed laterally when continued it touches the anterior surface of the condyles
= enables tooth to tooth contact during protrusive excursions

33
Q

What is the curve of monson?

A

The lateral curve of the occlusion of natural teeth in which each cusp and incisal edge touches or conforms to a segment if the surface of a sphere 4 inches (102mm) in radius with its centre in the region of the glabella

34
Q

What is cradocks classification?

A

Of support

= mucosa borne, tooth borne or tooth and mucosal borne

35
Q

What is kennedys classification?

A

Shows the number and location of saddles

36
Q

What are the considerations that need to be taken into account for mucosa borne denture designs?

A

Maximum extension
Hamular notch
Tuberosities
Retro molar pad

37
Q

What undercuts are needed for a cobalt chrome, stainless steel/cast gold and wrought gold clasp?

A
  1. 25
  2. 5
  3. 75
38
Q

What are the principles of Every design?

A

Point contact between adjacent standing and artificial teeth
Wide embrasure
No occlusal interferences
3mm gingival clearance
Correct denture extension with accurate fit and the polished surfaces to assist muscular control
Distal stop

39
Q

How is retention achieved through the every denture?

A

Friction
Cohesion
Adhesion

40
Q

What is RPI (rest, plate, I bar) system?

A

System of a clasp unit design for lower partial dentures with bilateral free end saddles to provide direct retention, it only applies to free end saddles and the mandible

41
Q

How do acrylic dentures fracture?

A

Impact or fatigue

42
Q

What is impact?

A

Where one hard blow results in instant breakage, this can be the result of an accident (dropping, stepped on or chewed by dog)

43
Q

What is fatigue?

A

When the denture base is subjected to repeated stresses

44
Q

What may fatigue fractures be associated with?

A 
The design of the denture
Oral anatomy of the patient 
It's use or abuse by the patient 
Factors introduced in the laboratory 
Previous repairs
45
Q

What is the main purpose of the bite registration during the stages of partial denture construction?

A

To be able to register the relationship between the jaws so that the master casts can be articulated

Yr 3 Restorative - Prosthetics COPY (3 decks)

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