Manual & Ultrasonic Cleaning

Question 1

How is manual washing carried out?

Answer 1

• Water = 30-35C
• Neutral enzyme detergent
• Plastic brush
• Rinse with demin water + dry non-linting cloth

Question 2

What are the 4 types of demineralised water?

Answer 2

1. RO
2. Distilled
3. Deionised
4. Sterile for irrigation

Question 3

Why is demineralised water used?

Answer 3

Organic & mineral compounds may:

• Harm devices (limescale)
• Provide rough surfaces for microbe adhesion

Question 4

What PPE is required for manual wash?

Answer 4

• Face mask
• Gloves (marigold type)
• Disposable gown

Question 5

What devices are appropriate for manual washing?

Answer 5

Handpieces

do NOT put in ultrasonic

Question 6

What are the functions of detergents?

Answer 6

Remove soil

hydrophobic end-soil, hydrophillic end-water

Question 7

How do ultrasonic cleaners work?

Answer 7

• High frequency sound waves
• Micro-bubbles produced -> cavitation on implosion
• Energy released removes soil from surfaces

Question 8

Why must an ultrasonic bath be degassed?

Answer 8

Oxygen inhibits cavitation

Question 9

How are instruments loaded into the ultrasonic baths?

Answer 9

• Open hinged instruments

- No overlapping

Question 10

When should an ultrasonic bath be drained?

Answer 10

• Every 4 hours

- When visibly soiled

Question 11

How are instruments treated following ultrasonic cleaning?

Answer 11

Rinse with RO water + dried

Question 12

How is a DAILY test carried out for an ultrasonic bath?

Answer 12

• Printout = check correct time, temp

- Sign and log in book

Question 13

How is a WEEKLY test carried out for an ultrasonic bath?

Answer 13

• Daily test +
• Protein test strip
  
  • -> Read results and log

Question 14

How is a QUARTERLY test carried out for an ultrasonic bath?

Answer 14

Foil ablation test

• -> Erosion pattern should be similar on all strips
• -> Extent of erosion consistent