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3 Past Papers > 2013 Resit MSA > Flashcards

2013 Resit MSA Flashcards

1
Q

What 4 factors can cause tooth mobility?

A

PDL width
PDL height
Inflammation
Number, shape and length of roots

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2
Q

In what 2 circumstances of tooth mobility would you intervene?

A

If mobility is progressively increasing
If mobility is symptomatic

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3
Q

If a patient with moderate/advanced perio had successful HPT, would their mobility increase or decrease and why?

A

Decrease
HPT removes any bacteria that caused loss of attachment and promotes attachment of long junctional epithelium to the root, increasing stability

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4
Q

Patient has mobile lower incisors causing discomfort but refuses XLA. Advise treatment and disadvantages of this.

A

Splinting
It can create hygiene difficulties

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5
Q

What are 2 aims when retracting a flap?

A

Access to operative field
Protect soft tissues
Direct vision

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6
Q

Give 4 factors that influence the design of a flap

A

Location of surgical site
Post-operative aesthetics
Retraction
Surgical procedure being carried out

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7
Q

What instrument is used to remove bone?

A

Straight electric handpiece with saline cooled bur

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8
Q

What are the 3 methods of debridement?

A

Irrigation - saline into socket and under flap
Physical - bone file to remove soft tissue debris
Suction - aspirate under flap

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9
Q

What 3 blood tests can be used to investigate a bleeding disorder?

A

FBC - full blood count
INR
aPPT - activated partial thromboplastin time

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10
Q

Name an inherited coagulation disorder

A

Haemophilia A
Haemophilia B
Von Williebrand’s disease

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11
Q

Name a disorder of platelet numbers?

A

Thrombocytopenia

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12
Q

What LA technique is used for XLA of 47 when the patient has a bleeding disorder?

A

Articaine infiltration as risk of bleed into pterygomandibular space with IDB

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13
Q

Name 2 clotting factors affected by warfarin

A

Vitamin K dependent clotting factors - II, VII, IX and X

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14
Q

What LA technique should be used for XLA of 47 in a patient with warfarin?

A

IDB

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15
Q

Name 3 forms of candidosis

A

Erythematous
Pseudomembranous
Hyperplastic

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16
Q

Name a polyene antifungal and its mechanism of action

A

Nystatin
Binds to ergosterol, leading to increased membrane permeability and eventually cell death

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17
Q

Give 2 resistance mechanisms of candida

A

Biofilm formation - production of ECM makes it difficult for drugs to penetrate the biofilm
Fungal cells increase the expression of efflux pumps that actively pump antifungal drugs out of the cell

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18
Q

Name 1 species of candida other than albicans and how to differentiate the 2?

A

Candida. glabrata - it is resistant to azole antifungals, which candida. albicans is not

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19
Q

Before prescribing F- mouth rinse, what should you check before prescribing?

A

Fluorosis
Allergy

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20
Q

What is the daily strength of F- mouth rinse?

A

230ppm

21
Q

How do you decide between conventional vs post and core?

A

Post and core when remaining tooth tissue doesn’t provide enough retention for conventional crown to be prepared
Depends on root canal shape, length, diameter and presence of ferrule

22
Q

What is the function of a post?

A

Core retention

23
Q

What 2 materials are used in post and cores?

A

Core - composite
Post - cast metal, steel zirconia or carbon/glass fibre

24
Q

Give 3 ways to determine post length?

A

Radiographic length of root - should be 1/2-1/3 of root length
Post should at least be height of crown
3-5mm of GP in apex of root

25
Q

What problem does a wide post give?

A

Root fracture

26
Q

What problem does a narrow post give?

A

Retention problem

27
Q

Give 3 general health effects of smoking

A

Increased cardiovascular disease risk
High blood pressure
Increased risk of respiratory diseasew

28
Q

Give 3 oral health effects of smoking

A

Halitosis
Oral cancer
Xerostomia

29
Q

Describe the margin design and reduction of a labial incisor crown prep and give the benefits of this design

A

Shoulder margin reduced by 1mm and 1.5mm where in occlusion
Allows smooth transition from porcelain to tooth, continuous colour, thick margin so colour is maintained

30
Q

Describe the margin design and reduction for a palatal incisor crown prep and give its benefits

A

All ceramic, shoulder 1-1.5mm, if MCC then chamfer palatally
Preserves tooth tissue, easy to place, thinner reduction at these areas

31
Q

Give 4 properties of impression materials suitable for crown prep

A

Dimensionally stable
Hydrophilic
High tear strength
Low rigidity

32
Q

What is xerostomia?

A

Dry mouth caused by reduced salivary flow

33
Q

Give 3 oral health problems exacerbated by xerostomia

A

Caries
Candidosis
Dysphagia

34
Q

Name 4 drugs that cause xerostomia?

A

Tricyclics
Opioids
Diuretics
Nicotine

35
Q

Give 2 non drug related causes of xerostomia

A

Sjögren’s syndrome
Radiotherapy to the head and neck

36
Q

What does ARAB stand for?

A

Active component
Resistance
Anchorage
Baseplate

37
Q

What component corrects a posterior crossbite?

A

Midline palatal screw

38
Q

Name 2 areas of primary support on a maxillary impression

A

Hard palate
Residual ridge

39
Q

Name an area of primary support in mandibular impressions

A

Buccal shelf

40
Q

What group does chlorhexidine belong to?

A

Bisguanide

41
Q

Describe the mode of action of chlorhexidine

A

Adheres to pellicle coated tooth surface and to bacterial membrane increasing cell permeability and causing cell death

42
Q

What is the substantivity of chlorhexidine?

A

12 hours

43
Q

What volume, concentration and frequency of chlorhexidine should be given?

A

0.2%, 10mg twice daily for 1 week
20mg per day

44
Q

Give 4 indications for chlorhexidine

A

Difficult OH due to trauma
Treatment of candida infection
Immunocompromised patient
Endo irrigation when NaOCl is contraindicated

45
Q

What is SIMD?

A

Scottish Index of Multiple Deprivation
Ranks data zones based on deprivation, factors include housing, crime, unemployment, and education

46
Q

What are the key links in the chain of infection?

A

Infectious agent
Reservoir
Portal of entry
Mode of transmission
Portal of exit
Susceptible host

47
Q

What can reduce chance of injury when playing contact sports?

A

Custom made bite splint absorbs initial shock form trauma

48
Q

Give 3 ways to determine if an impression is usable

A

Accuracy of capturing tooth position
Fine detail production
Material uniformity

49
Q

List 4 potential faults of an inlay impression

A

Distortions or tears
Air bubbles or voids
Poor detail reproduction
Insufficient thickness

3 Past Papers (10 decks)

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