Dental disease- Periodontal disease Flashcards

1
Q

What do we expect to see in healthy gingvia?

A

Colour: pink

Texture: stipling

Margins: defined (knife edge and scalloped)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is gingival crevicular fluid?

A

This is liquid that contains antibodies and so is used for host defence.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do you see in the mouth of a patient with gingivitis?

A

Colour: red

Texture: no stipling

Margins: inflamed.

Plaque score: high

Bleeding score: high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Compare the immune response occuring in a healthy mouth compared to one that is suffering from gingivitis?

A

Healthy mouth:

  • some gingival crevicular fluid
  • Phagocytes/ Lymphocytes and complement.

Gingivitis:

  • Increased flow of gingival crevicular fluid
  • Increased lymphocytes and monocytes.
  • Influx of neutrophils.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Why do the gingiva bleed on probing?

A

Because the Epithelium becomes uclerated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Why does cleaning teeth reverse gingivitis?

A

It removes the microbial challenge.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Compare gingivitis and periodontitis (definitions)

A

Gingivitis is inflamation of the soft tissues.

Periodontitis is inflamation of the soft and hard tissues.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

At first sight- How does a patient presenting with periodontitis differ to a patient with gingivitis?

A

At first glance, they don’t.

You need to probe in order to see the difference.

On probing a patient with periodontitis will have pockets.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Compare true and false pockets

A

True pockets are when the pockets are due to LOSS of attachment and migration of the junctional epithelium.

False pockets are due to inflamation of the tissues.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Discuss the loss of attachment in a dental patient?

A

The rate of loss of attachment can be unpredictable so we have to monitor it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the biofilm?

A

A layer of micro-organsisms found on the teeth- They interact in symbiosis.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe the biofilm in a patient suffering from periodontitis?

A

It is dysbiotic = unbalanced. Causing the inflammation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Discuss the mechansims that contribute to the mouth’s host immune response

A

Saliva- the immune response that protects the teeth (made of antiboides and enzymes e.g. S-Iga/ lyzozyme)

Gingival Crevicular fluid (will bathe the area)

Inflammatory and Immune response (neutrophils)

Epithelium (as a physical barrier which sheds cells and produces inflammatory mediators. The gingival tissues allow neutrophils to transvere through)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What determines bone resorption?

A

The inflamatory Mediators produced.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How do antibodies protect the immune system?

A

activating complement

marking bacteria (opzonisation) for phagocytosis

inhibiting adhesion and invasion

Neutralising toxins.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are MMPs?

A

Matrix metalloproteinases which are enzymes that cause matrix degradation in periodontitis.

17
Q

What is the normal level of bone?

A

1-2mm below the ADJ

18
Q

Name and compare the different patterns of bone loss

A

Vertical bone loss- This occurs in thicker bone as the diameter will not reach the full bone.

Bone depth differs on either side

Horizontal bone loss- This occurs in thinner bone as the 2mm diameter of tissue destruction damages all of the bone.

Bone depth is the same.

Furcation bone loss- when bone is lost and the furcation regions are exposed.

19
Q

Which type of bone loss has a greater chance at re-generation and why?

A

Vertical bone loss as there is a wall of bone where you can pack re-generative materials.

20
Q

Why is smoking a risk factor of periodontal disease?

A

Smoking affects your immune system. This affects your immune response. So when the bacteria change, the patient is more likely to get Periodontal disease.

Smoking also makes the treatment less succesful

21
Q

What are the local risk factors of periodontal disease?

A
  • Anatomical :Enamel pearls, grooves, furcations, gingival recession.
  • Tooth position- malalignment/ tooth crowding/ tiping/ migration and occlusal forces.

Iatrogenic- overhangs/ orthodontic appliances/defective margins and poorly designed RPDs.

22
Q

What do you see in the mouth of a patient with periodontitis?

A

Bleeding = on probing

Radiographic bone loss (mobility of teeth)

Gingival recession

Probing depth of >4mm

Splaying of teeth.

23
Q

What instrument do we use to measure peridontal pockets?

A

WHO CPITN BPE probe

24
Q

What triggers Periodontal disease?

A
  • Plaque and calculus accumulation
  • Biofilm components
  • Expression of Virulence factors
25
Q

What determines if inflammation will progress or resolve?

A

The interaction between the host immune response and the bacteria.

26
Q

Discuss P. Gingivalis.

A

ascaccharolytic- energy source is provided by proteins and peptides.

It is inflammaphillic- Inflammatory environment favours the production of these virulence factors:

Gingipans- proteases that degrade host proteins and activate mmps

Atypical LPS- do not signal through TLR 4

27
Q

Describe the pathogenesis of a patient suffering from gingivitis.

A
  1. increased TLR stimulation
  2. Increased production of pro-inflammation mediators
  3. Acute inflammatory response

Clinical- red and swollen

function- To increase vasodilation and cell migration

  1. Increased gingival crevicular fluid
  2. number of neutrophils in area increases
  3. monocytes are recruited, activated and differentiate into macrophages.
  4. Lymphocytes are recruited to fine tune the immune response.
28
Q

What causes tissue destruction by neutrophils?

A
  • Degradative enzymes (major source of MMPS)
  • Oxygen radicals and inflammatory cytokines.
29
Q

How does an immune over-reaction cause periodontitis?

A

There is an excess of neutrophils- This causes tissue destruction

30
Q

How does an immune under-reaction cause periodontitis.

A

There are not enough neutrophils.

This allows oral bacteria to run riot and cause tissue damage.

31
Q

What are the roles of adaptive immunity?

A

Protective : Prevention of systemic infection.

Destructive- Inflammation causing alveolar bone loss.

32
Q

Describe the stages leading to inflammation.

A

T & B cells present in early lesions (gingivitis)

Lesion progresses- Rich in CD4 T cells(helper)/ B cells (antibody response) and dendritic cells (antigen presenting)

Dysbiotic biofilm cannot be controlled.

Periodontitis- B cells and Plasma cells.

IgG cannot control dsybiotic

Chronic inflammation.

33
Q

Describe bone formation and resorption in health.

A

RANKL is produced by leukocytes.

RANK binds to RANKL to activate osteoclasts (bone resorption)

OPG inhibits RANK binding to RANKL

Allowing bone synthesis

34
Q

Describe bone resorption in inflammation.

A

There is high levels of RANKL and low levels of OPG.

So bone resorption exceeds bone synthesis.

35
Q

Discuss the inflammatory response in periodontitis?

A
  1. TLR stimulated. causing secretion of Cytokines chemokines and AMP.
  2. Vasodilation and selective leukocyte recruitment (mainly neutrophils)
  3. Bacterial products activate neutrophils & stimulate the secretion of inflammatory mediators.
  4. Activated lymphocytes express RANKL
  5. Alveolar bone resorption because
    - RANK binds to RANKL
    - Pro-inflammatory cytokines inhibit bone formation.
    - Elevated and dysregulated mmp activation.