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DMD2 > PROSTHODONTICS & OCCLUSION > Flashcards

PROSTHODONTICS & OCCLUSION Flashcards

1
Q

Define the following denture terms

Saddle
Abutment Teeth
Pontic
Flange
Retainer
Connector
Occlusal Rest
A

Saddle - space in the arch where teeth are missing and will be replaced - edentulous areas

Abutment Teeth - teeth adjacent to the saddle, teeth that will have retainers

Pontic - artificial/denture teeth

Flange - the acrylic component that is replacing soft tissue
Retainer - clasps on abutment or other supporting teeth

Connector - major and minor components which connect the denture to smaller components and/or itself

Occlusal Rest - denture component that is placed on occlusal surfaces to resist forces towards the gingiva

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2
Q

What steps do you need to take in clinically making a denture?

A

Primary impressions

Facebow and MMR

Complete any other dental treatment needed

Secondary impressions (with special tray)

Facebow, MMR and tooth shade selection

Wax rim try in

Primary denture issue

Secondary denture issue (if adjustments needed to be made based on primary)

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3
Q

A patient attends your clinic and is missing teeth 14-22

What would be the kennedy classification of this denture

A

Kennedy class IV

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4
Q

Describe a Kennedy class II

A

Kennedy class two is a unilateral edentulous area posterior to the remaining teeth

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5
Q

A patient attends the clinic with the following teeth missing;
(NB; 37 present)

36, 35, 44, 45, 46, 47

What would be the kennedy classification of this denture

A

Kennedy class II modification I

The most posterior saddle is in Q4 as all posterior teeth are missing, and there is only one additional saddle in Q3 –> 1 modification

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6
Q

Which of the following statements is correct;

A. You can have a modification on Kennedy class IV
B. If there is only one tooth missing, there is no kennedy classification
C. Kennedy class III is a unilateral edentulous area bounded by natural teeth
D. If you have a bilateral edentulous area posterior to remaining teeth this is a Kennedy class II
A

C is correct

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7
Q

What are some of the pros and cons of a CoCR denture

A

Pro’s
Strong, less bulky than acrylic, fracture resistance, tooth support with occlusal rests

Con’s
High thermal conductivity, complex and more expensive to make, difficult to repair

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8
Q

Which of the following statements is incorrect

A. The setting reaction of gypsum is hemihydrate –> dihydrate
B. The setting reaction of gypsum is an exothermic reaction
C. Die stone is the most dense material relative to plaster and stone
D. If you add more water to your mix the setting time is faster and the material is weaker

A

D - partially correct, more water:powder will result in a weaker cast BUT this will slow the setting time rather than increasing it

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9
Q

Discuss why you would need a clean bowl and spatula when mixing gypsum

A

Any gypsum slurry or set gympsum remaining in the bowel/on the spatula provides nucleation sites for the new mix and will therefore speed up the setting reaction

Also infection control

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10
Q

Which of the following materials is NOT an elastic material

A. Alginate
B. Polyether
C. Agar
D. Wax

A

D - wax in a non-elastic material

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11
Q

Differentiate between the mucostatic and mucocompressive impression techniques

A

Mucostatic
- An impression recording the undisplaced mucosa, retention without load is excellent but distribution to tissues under load may be uneven

Mucocompressive
- An impression recording the mucosa under load. Even distribution under load but fit when not under load may be compromised

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12
Q

What is the chemical formula of alginate

A

CaSO4 + 2H2O + Na-Alginate

The calcium, sulfate and alginate salt (alginate-Na) are all soluble in water

calcium binds to alginate to move the reaction from a sol–>gel

retarders are added to preferentially bind the calcium to slow the setting reaction

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13
Q

What is the chemical formula of Gypsum

A

Di-Hydrate - CaSO4+2H2O (stone)

Hemi-Hydrate - CaSO4+1/2H2O (powder)

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14
Q

What is the official definition of occlusion

A

From Pros Lectures:

The static relationship between the incising masticating surfaces of maxillary or mandibular teeth or tooth analogues

From Occlusion Lectures:

Occlusion is the dynamic, biological relationship of the teeth, jaw muscles and TMJ that determines tooth contact relationships for function

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15
Q

Which of the following are the correct measurements of the condyle

A. lateral-medial 20mm, anterior-posterior 15mm
B. lateral-medial 15mm, anterior-posterior 20mm
C. lateral-medial 10mm, anterior-posterior 15mm
D. lateral-medial 15mm, anterior-posterior 15mm

A

A

I know this a pain in the ass Q but he mentioned we NEED to know these average values

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16
Q

What are the disc ligaments in the TMJ and where do they attach

A

Discal; lateral and medial
- attach the disc to the condyle

TMJ; lateral and medial
- attaching the condyle to the skull

17
Q

Define centric relation, centric occlusion, ICP and RCP

A

CR - operator guided position, where the condyle is in the most anterior superior position

CO - how the teeth come togerther in a F/F (complete edentulous case). A reproducible, designed occlusal position

ICP - functional tooth contacts in dentate/partially dentate patient. The complete intercuspation regardless of condyle position

RCP - natural tooth contacts when the jaw is guided into CR

18
Q

Which of the following statements is incorrect

A. The condyle has a functional relationship with the articular eminence
B. Force is always applied along the thinnest most avascular portion of the disc
C. The medial pterygoid attaches to the articular disc
D. The articular disc has three regions; anterior, posterior and intermediate

A

C is incorrect, its the lateral pterygoid that inserts into the disc of the TMJ

19
Q

What jaw muscles are involved in chewing

A 
Masseter
Medial & lateral pterygoid
Buccinator
Temporalis
Inframandibular muscles
20
Q

Describe the difference between a mediotrusive contact and a mediotrusive interferance

A

A mediotrusive contact occurs when a patient is moving the jaw laterally (laterotrusion) from ICP to a chewing side and the contralateral teeth are still in contact.

Where these contacts interfere with the lateral movement they are called interferences

21
Q

In the denar face bow system the third point of reference is measured;

A. 40mm above the incisal edge of the maxillary incisors on the lip/cheek
B. 43mm above the incisal edge of the maxillary incisors on the side of the nose
C. 42mm above the incisal edge of the maxillary incisors on the side of the nose

A

C is correct

22
Q

In the verification of jaw transfer you are taking a transfer of the jaw/teeth in CR

What wax do you use?
Do you want perforation?
Which teeth are you trying to record?

A

Moyco Wax

The goal is to get an impression WITHOUT perforation, as once there is perforation the recording you have is ICP not CR

You are trying to record contacts on the molars and pre-molars

23
Q

Which of the following is correct

A. Splints are used for treating bruxism
B. Splints can be given as an initial management of TMD and myofascial pain where regular pain management has failed
C. Splints only have physiological affects
D. Splints create an “loading” effect of the TMJ via increasing the OVD

A

B is correct

A - this was a gimme
C - splints have psychological and physiological effects
D - they create an “unloading” effect on the TMJ

24
Q

What are the four most important components in occlusal splint design?

A
  1. Full arch coverage of occlusal surfaces (maxillary OR mandibular)
  2. Flat plane contact with opposing cusp tips at RCP
  3. Anterior tooth guidance for lateral and protrusive movements
  4. Bilateral and simultaneous contacts around the arch, anterior and posterior teeth at median occlusal position
25
Q

What is the adequate material thickness of an occlusal splint?

A

Posterior teeth must be separarted by at least 1mm

26
Q

What guidance are you aiming for in an occlusal splint

A

Canine guidance

27
Q

True/False

  1. When measuring the distance between RCP and ICP on occusal surfaces the RCP is always mesial
  2. When measuring the anterior overbite (on lower central incisors) using RCP and ICP, the RCP is always higher
A
  1. False - the RCP is always the more distal mark

2. True

28
Q

Discuss overbite vs. overjet

A

Overbite - in the occlusal-vertical dimension, it is the proportion of coverage of the lower incisors by the upper incisors (ie. deep bite)

Overjet - in the anterior-posterior dimension, it is the space between the upper and lower anteriors when fully closed.

DMD2 (13 decks)

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