Quizzes

Question 1

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

Answer 1

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

Question 2

What is the definition of ‘centric jaw relation’?

Answer 2

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

Question 3

What is the retruded arc of closure?

Answer 3

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

Question 4

What is centric occlusion?

Answer 4

Maximal contact between opposing teeth

Question 5

What is the freeway space?

Answer 5

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

Question 6

What is the neutral zone?

Answer 6

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

Question 7

What is an embrasure?

Answer 7

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

Question 8

What can be used to record bite registration?

Answer 8

Modelling wax

Impression material paste

Question 9

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

Answer 9

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

Question 10

What is the purpose of surveying dental casts?

Answer 10

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

Question 11

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

Answer 11

Where the cast sits

Question 12

What is the vertical column of a surveyor used for?

Answer 12

Supports the double jointed arm

Question 13

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

Answer 13

Where the hand piece is held

Question 14

What is the chuck of an articulate used for?

Answer 14

To secure various surveying instruments

Question 15

What is support?

Answer 15

The mechanical function which reduces mucosal loading of a partial denture

Question 16

What is bracing?

Answer 16

The mechanical function which prevents lateral shifting of a partial denture

Question 17

What is bracing provided by?

Answer 17

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

Question 18

What is retention?

Answer 18

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

Question 19

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

Answer 19

Retention, guide surfaces, aesthetics

Question 20

What should be avoided when determining a path of insertion?

Answer 20

Interferences
Compromised appearance
Poor distribution of retentive undercuts

Question 21

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

Answer 21

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

Question 22

What length should direct retainers be at least in cm?

Answer 22

At least 1 cm

Question 23

What are the reasons for master cast duplication?

Answer 23

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

Question 24

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

Answer 24

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

Question 25

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

Answer 25

10 degrees on the horizontal plane

Question 26

What movements can the free plane average value articulator achieve?

Answer 26

Approximate condylar movements

Question 27

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

Answer 27

30 degree

Question 28

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

Answer 28

``` 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) ```

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

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

Answer 31

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

Question 32

What is the definition of the curve if spee?

Answer 32

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

Question 33

What is the curve of monson?

Answer 33

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

Question 34

What is cradocks classification?

Answer 34

Of support | = mucosa borne, tooth borne or tooth and mucosal borne

Question 35

What is kennedys classification?

Answer 35

Shows the number and location of saddles

Question 36

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

Answer 36

Maximum extension Hamular notch Tuberosities Retro molar pad

Question 37

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

Answer 37

0. 25 0. 5 0. 75

Question 38

What are the principles of Every design?

Answer 38

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

Question 39

How is retention achieved through the every denture?

Answer 39

Friction Cohesion Adhesion

Question 40

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

Answer 40

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

Question 41

How do acrylic dentures fracture?

Answer 41

Impact or fatigue

Question 42

What is impact?

Answer 42

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

Question 43

What is fatigue?

Answer 43

When the denture base is subjected to repeated stresses

Question 44

What may fatigue fractures be associated with?

Answer 44

``` 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 ```

Question 45

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

Answer 45

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