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Past Papers > Mock 2018/2019 > Flashcards

Mock 2018/2019 Flashcards

1
Q

What are the 3 components of RPI system?

A
  • rest seat on mesial
  • distal proximal plate
  • I bar
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2
Q

RPI system is used to allow vertical rotation of a distal extension saddle into denture bearing mucosa without damaging periodontitis of abutment tooth. How is this achieved?

A
  • as saddle sinks into denture bearing mucosa, there is rotation of denture about mesial rest
  • both distal guide plate and I bar rotate downwards and mesial and disengage from the tooth
  • potentially damaging torque is avoided
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3
Q

Why is lingual bar chosen?

A
  • sufficient depth of sulcus
  • good oral hygiene
  • requirement for rigidity
  • materials could be cobalt chromium/ gold alloy
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4
Q

Name 2 fixed restorative tx options the pt may wish to consider as an alternative to lower removable partial denture?

A
  • distal cantilever adhesive bridges to replace 35 and 45 using 34 and 44 as abutments
  • implant retained restoration
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5
Q

What are the 3 main criteria must be fulfilled before the RC system can be obturated?

A
  • no symptoms
  • canal must be able to be dried
  • full biomechanical cleaning
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6
Q

3 constituents of GP cones

A
  • radiopacifier - barium salts
  • zinc oxide 59-75%
  • waxes, coloring agents, anti- oxidants
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7
Q

What is the function of root canal, sealer when used with GP?

A
  • to fill space between GP and the root canal wall
  • provide a fluid tight seal
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8
Q

Give. 3 generic type sealer that is commonly used in root canal obturation?

A
  • zinc oxide eugenol
  • resin based
  • calcium hydroxide
  • calcium silicate
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9
Q

2 options which could be provided to provisionally restore tooth whilst ends tx is performed

A
  • provisional overdenture
  • provisional post crown
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10
Q

4 materials a post core can be made of?

A
  • gold
  • ceramic
  • zirconia
  • carbon fiber
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11
Q

2 factors which will guide your decision on length of post

A
  • post will extend beyond the level of alveolar bone
  • post must be at least as long as height of crown being replaced
  • 4-5mm of GP must remain apical to post to maintain adequate apical seal
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12
Q

2 materials used to cement a definitive post and core

A
  • resin modified glass ionomer luting cement
  • composite resin luting cement with a dentine bonding agent
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13
Q

What is the likely cause of gingival recession seen in lower anterior sextant?

A
  • traumatic overbite
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14
Q

Where else may you see signs of gingival stripping from traumatic overbite?

A
  • palatal gingiva of upper anteriors
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15
Q

5 investigations you would perform after charting?

A
  • BPE
  • sensibility testing
  • periapical radiograph of lower anteriors and any other teeth with advanced attachment loss
  • mobility scores
  • clinical photographs
  • full mouth periodontal pocket chart
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16
Q

2 general approaches to patient’s initial tx

A
  • hygiene phase therapy
  • upper anterior bite raising appliance for night time use
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17
Q

At reevaluation, there are no deep pockets and OH is excellent. Lower incisors are mobile, causing patient concerns. what would you offer to manage mobility?

A
  • splinting
18
Q

To which group of chemicals does chlorhexidine digluconate belong?

A
  • bisbiguanides
19
Q

Describe the mechanism of action of chlorhexidine digluconate?

A
  • chlorhexidine binds to microbial cell walls (negatively charged phospholipids) causing cell wall damage (membrane disruption) and interfering with cell wall permeability (osmotic damage)
  • leakage of cell contents leading to cell death
  • dicationic, one ion binds to oral surfaces and one to bacterial cell wall
20
Q

The activity of an oral antiseptic depends on its substantivity. Define substantivity and provide 2 examples of factors that may influence substantivity of chlorhexidine in oral cavity?

A
  • defined as the capacity of a chemical agent to continue its therapeutic effect for a prolonged period after initial application
  • it depends on:
    • adsorption to oral surfaces
    • maintenance of anti microbial activity
    • slow neutralization of antimicrobial activity
    • concentration of chlorhexidine
    • presence/ levels of anionic neutralizing agents
21
Q

4 indications of use of chlorhexidine MW?

A
  • post surgery
  • maintain OH in patients with jaw fixation
  • acute necrotising ulcerative gingivitis
  • recurrent oral ulceration
  • denture stomatitis
  • preoperative rinsing
  • tx of dry socket
  • endodontic irrigant
22
Q

List a set of published guidelines for removal of wisdom teeth?

A
  • SIGN Scottish Intercollegiate Guidelines Network
  • NICE National Institution for Health and Clinical Excellence
23
Q

3 reasons for removal of impacted lower wisdom teeth

A
  • pericoronitis
  • caries
  • periodontal disease
  • pathology
24
Q

What is the incidence of temporary and permanent loss of sensation following wisdom teeth removal?

A
  • temp: approx 5-20%
  • perm: < 1%
25
Q

4 further post-op complications of removing wisdom teeth

A
  • pain
  • swelling
  • trismus
  • bruising
  • bleeding
  • dry socket
26
Q

8 year old child attends surgery with enamel- dentine pulp fracture to 11- what 2 things do you need to know about the injury to decide whether to pulp cap or pulpotomy?

A
  • size of exposure
  • length of time since injury occurred
27
Q

You decided to provide pulpotomy for tooth 11. Explain the stages of procedure you now carry out.

A
  • apply rubber dam
  • remove pulp tissue at 2-3mm radius around exposed area
  • assess bleeding- no bleeding then remove more tissue
  • gain hemorrhage control using saline soaked cotton wool ball
  • assess bleeding, if hyperaemic then remove more tissues
  • once bleeding stops, apply non setting CaOH
  • seal with GI
  • restore tooth with acid etched composite tip
28
Q

Pulp remained vital. What signs would you expect to see in radiograph?

A
  • continued root development
  • continued thickening of dentine in root walls
  • apical development
  • no pathology
29
Q

3 uses of URA apart from tipping and tilting of teeth

A
  • as a space maintainer
  • habit breaker
  • reduce overbite
  • retainer
30
Q

What other types of space maintainer could be used?

A
  • fixed palatal arch
31
Q

How would you gauge if the patient has been wearing their appliances as instructed? Give 8 signs of good wear.

A
  • ask them
  • can they speak with the appliances in their mouth
  • is it in when they enter the surgery
  • can they handle the appliances
  • does it look worn
  • has teeth move
  • is the active component passive
  • does it fit adequately
  • signs of wear on palate
  • no excess of salivation
32
Q

A 68 yr old has been given medication to prevent her from getting another fracture. What 2 drugs is she likely to be on?

A
  • bisphosphonate
  • calcium
33
Q

What oral condition may arise from these drugs?

A
  • osteonecrosis of jaw
34
Q

How could this condition be managed?

A
  • conservative approach
  • Antiseptic MW
  • antibiotics
  • surgical debridement
  • primary closure
35
Q

How to best avoid jaw fracture in the first place?

A
  • avoid extractions
  • avoid trauma
  • good OH
36
Q

Stage 1 of oral transport

A
  • food gathered on tongue tip
  • tongue retracts taking food back to level of posterior teeth
37
Q

Stage 2 of oral transport

A
  • sufficiently masticated food is transferred to oropharynx by a squeeze back mechanism in which the bolus is squeezed between tongue and palate
38
Q

2 biological factors that can affect masticating performance of a human being

A
  • number of occluding teeth/ occlusal contact area
  • biting force
39
Q

Shortened dental arch

A
  • dentition in which posterior teeth have been lost
  • Usually consists of 6 anteriors and 4 premolars in each jaw: 20 teeth in all
40
Q

3 aspects of oral function that are regarded by proponents of SDA as acceptable in older patients

A
  • acceptable masticatory performance
  • acceptable aesthetics
  • can maintained in healthy state by the patient

Past Papers (5 decks)

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