SAQ

Question 1

Define Haemostasis

Answer 1

Haemostasis is the stoppage of bleeding

Question 2

Name and explain the phases of Haemostasis

Answer 2

1. Vascular phase: vasoconstriction to limit amount of blood loss
2. Formation of platelet plug via platelet activation
3. Intrinsic and extrinsic coagulation pathway. both end with liquid blood turning into a solid via conversion of fibrinogen to fibrin
4. Anticlotting mechanism are activated to remove the clot and allow healing of the blood vessel

Question 3

Describe and explain the factors that allow Haemostasis to work efficiently.

Answer 3

1. Integrity of the vessel
2. Adequate number of platelets
3. Proper functioning of the coagulation cascade
4. Proper functioning of the platelets
5. Adequate levels of clotting factors

Question 4

Describe the. ideal properties of denture polymers

Answer 4

1. Resilent
2. Tough
3. High impact strength
4. Dimensional stability
5. Repairable if breaks 6. Good thermal conductor 6. Radiopaque
6. Cheap

Question 5

Describe the ISO requirements for denture base polymers.

Answer 5

1. Bond to denture tooth
2. Biocompatible
3. High polish
4. Translucent
5. Colour/ colour stability
6. No porosity
7. Low residual monomer
8. Flexural strength >= 65 9. MPa Flexural modulus >= 2 GPa

Question 6

Explain the setting reaction of PMMA (Poly Methyl Methacrylate).

Answer 6

1. Chemcially cured by Tertiary amine (accelerator), Benzoyl peroxide (initiator) and Hydroquinone (inhibitor)
2. Light activated using blue light
3. Heat and pressure controlled

Question 7

Give soem indications for a resin retained bridge

Answer 7

1. Single tooth space
2. Motivated patient
3. Suitable abutment tooth
4. Good periodontal health
5. Plenty of enamel to bond to
6. Well positioned
7. Occlusion is favourable (the pontic won’t be in guidance)
8. Young patient

Question 8

Give soem contra indications for a resin retained bridge

Answer 8

1. Patient not motivated
2. Poor oral hygiene
3. Poor access
4. Inadequate enamel area
5. Uncontrolled caries
6. Severe bone bone or soft tissue
7. Unfavoruabel occlusion
8. Inadequate periodontal support

Question 9

ist the information needed to complete a lab prescription for manufacture of a study model.

Answer 9

1. Patient name
2. Complete design go denture/ crown
3. Shape and shade
4. Date of apppoiintemtn
5. Date of miner appointment
6. Disinfected

Question 10

Explain how the study model is articulated when the patient’s dentition includes teeth that do not come together upon biting.

Answer 10

1, Opposing arch alginate impressions required

2. Blu mousse