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BDS3 Exam Questions > 2015 paper > Flashcards

2015 paper Flashcards

1
Q

Why is non setting calcium hydroxide an ideal inter appoinment medicament

A

pH = 12.5 - contributes to antimicrobial activity
Effective in removing tissue debris
Adhere directly to dentine rather than restorative material

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2
Q

What is aim of obturation

A

Traps remaining microorganisms within the root canal
Blocks apical foramina and dentinal tubules and accessory canals#
Prevent passage of micro-organisms and fluid aling root canal

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3
Q

Components of GP

A

Radiopacifier = (15%)
Zinc Oxide (65%)
Plasticiser (5%)

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4
Q

Reasons for using sealers

A

Seals between detintal wall and core
Fills voids and irregularities in canals and between GP points
Lubricates during condensation

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5
Q

2 characterstics of biofilm ECM that enable resistance to antimicrobials?

A

Biofilm impairs diffusion of antimicrobials
Biofilm has adhesive properties which trap antimicrobials and can be destroyed by enzymes
Extracellular DNA and biofilm specific resistance gene

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6
Q

2 bacteria involved in Perio

A

P.gingivalis

Prevotella intermedia

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7
Q

2 bacteria involved in caries

A

Streptococcus mutans

Lactobacilli

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8
Q

2 key features that allow carious bacteria to adhere and survive in acidic environment

A

adhesins
binding proteins - glucan binding protein
sugar modifying factors - fructanase, dextranase

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9
Q

2 systemic diseases related to perio

A

Diabetes
CVS
Rhemuatoid arthritis

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10
Q

What are ideal thermal properties of acrylic denture base and why

A

High softening temp - must not distort during ingesitng of hot fluids or cleaning
Thermal expansion same as artifical tooth to avoid internal stresses on cooling during manufracture

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11
Q

Mould liner used in making acrylic denture

A

Reduces porosity

Easier to carry out de flasking

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12
Q

What is gasous porosity

A

Shows fine uniform bubbles/ voids in thicker regions
Occurs due to exothermic reaction of polymerisation
Need efficent polymerisation to give high molecular weight polymer
Fast curing leads to gasous porosity

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13
Q

Why do you keep denture in moist environment outside the mouth?

A 
Prevent infection
More comfortable in patients mouth
For retention
If over dried can go brittle
Shape can change and no longer fit
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14
Q

What are 2 impression materials used for lower complete dentures?

A

Alginate
Polyether
Silicone

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15
Q

What is the defnitive name for master impressions

A

Secondary/definitive impressions

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16
Q

2 factors affecting physical retention

A

Border seal

Post dam

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17
Q

2 anatomical features used for position of upper posterior border

A

Hamular notches
Palatine fovea at vibrating line
Border of hard palate

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18
Q

3 anatomical features to include on lowers

A

Buccal shelf
Residual ridge
Retromolar pad

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19
Q

Maxiallry sinus border

A

Inferior border

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20
Q

Horizontal line for OPT parallel to floor

A

Frankfort plane

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21
Q

What happens if antrior are horizontally magnified

A

Patient too far back in machine

Canine behind the guidance mark

22
Q

Posterior horizontally wider on one side

A

Patient rotated in machine

23
Q

What type of radiograph would you do for pre XLA of 48 only

A

Right half panoramic

24
Q

What type of radiograph do you do for a child that can’t tolerate BW’s

A

OPT - setting 4

25
Q

What is a null hypotheisis

A

General statement suggesting no statistical significance in set of data

26
Q

What is xerostomia

A

Reduced or absent saliva flow

When flow of saliva <0.3ml/min of unstimulated saliva flow

27
Q

What are the oral impacts of xerostomia

A 
Increased caries risk
Increased perio risk
Candidosis
Dental erosion
Sialadentitis - infection of salivery gland
28
Q

Medications that cause xerostomia

A 
Diuretics 
Beta blockers
Anti covulsants
Antidepressants
Anti psychiotics
29
Q

What are other causes of xerostomia

A 
Radio and chemo
Parkinsons
Sjorens Syndrome
Cystic fibrosis
Rheumatoid Arhtritis
30
Q

2 modifications to enable wheelchair patient to get to first floor surgery

A

ground floor access
Handrails for support
Wide doors and corridors for wheelchairs
Wheelchair turning circle within surgery

31
Q

2 methods to communicate if cant write etc

A

Makaton
Picture boards
Talking mats

32
Q

How to get patient into suitable position for exam

A

Stand aid
Hoist
Banana Board
Wheelchair recliner

33
Q

Mouth access with cerebral palsy is difficult why?

A

Due to random and uncontrolled and muscle weakness/stiffness

34
Q

2 non pharmocological management for mouth access problem

A

Bedi shield
Open wide mouth rests
Toothbrush

35
Q

XLA 45 - what nerves are anaesthetised?

A

Inferior dental nerve

Lingual nerve/mental nerve

36
Q

How do you test anaesthesia?

A

Numbness of tongue and lower lip

Gently probe around area of tooth and determine if any pain felt

37
Q

3 possible nerve deficity

A

Anaesthesia (numbness)
Paraesthesia (tingling)
Dysaesthesia (unpleasant sensation/pain)

38
Q

What are 3 causes of nerve damage?

A

Crushing on removal of tooth
Cutting/shredding due to LA
Damage to nerve in surgery
Damage due to LA

39
Q

Upper 1 not erupting after decidious fell out due to trauma

What do you do on first interaction with patient

A 
Take medical and dental history
Radiographs and exams
Palpate the buccal sulcus
Maintain space
Monitor for 1 1/2 years
Refer for ortho
Surgical exposure - bond with ortho gold chain
40
Q

2 causes of failed eruption of permanent tooth

A

Trauma
Unerupted supernumary preventing eruption
Abnormal developmental position

41
Q

4 principles of ortho management for non eruption of 11

A 
Create space
Bonded retainer
Surgical exposure
Remove supernumary
Monitor 1 1/2years
42
Q

When is a suitable XLA time for lower 6’s

A

Bifurcation of 7’s
Presence of 5’s and 8’s on xrays
Class 1 incisor relationship

43
Q

TX plan for non carious upper 6’s

A

Compensating XLA

44
Q

What are 2 advantages of XLA 6’s at right time?

A

Caries free dentition
Spontaneous eruption of 7’s and space closure
Reduction of ortho

45
Q

2 disadvantages of XLA 6’s

A

Bad experience for child
Loss of a permanent tooth
GA risk

46
Q

3 PPE for carrying out manual cleaning and why?

A

Marigold gloves - protect hands from detergent which is iriitant
Plastic disposable apron - protect clothes from splashes when washing
Plastic visor to protect against aerosol during washing contaminated instruments

47
Q

When do you degas an ultrasonic and why?

A

Degas after filling from empty to remove air/oxygen from water
You degas oxygen asd can have affect cavitation and instrumentes may not be cleaned correctly

48
Q

2 examples of manual cleaning

A

Immersion - non lumen devices, mirros, probes

Non immmersion - lumened devices, handpieces

49
Q

Why use deionised water in sterilisers?

A

Prevents deposists of minerals on machine and instruments

50
Q

4 reasons that make you suspect trauma is non accidental

A 
Delay in seeking help
Account not compatible with story
Injuries to both sides of the body
Injuries with a particular pattern
Injuries to soft tissues
51
Q

2 effects of trauma on decidous teeth

A

Discolouration
Discolouration and infection
Delayed exofoliation of tooth

52
Q

4 effects of trauma on permanent successor

A 
Hypoplasia
Hypomineralisation
delayed eruption
Ectopic eruption
Damage to crown development
Damage to root development (dilaceration)

BDS3 Exam Questions (13 decks)

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