Which of the following cannot be reliably used for handwashing?

# Which of the following cannot be reliably used for handwashing?

A. Lysol

B. Cresol

C. Isopropyl alcohol

D. Chlorhexidine

The correct answer is A. Lysol.

Lysol is a phenolic compound derived from coal tar and is highly toxic to humans. It is recommended for disinfection of surfaces in hospital. 

These can be reliably used for handwashing: 

- Chlorhexidine

- Alcohols (isopropyl alcohol, ethyl alcohol)

- Iodine

- Cresol

- Chloroxylenol (dettol)

- Hexachlorophane

- Tincture of iodine

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Pseudomonal infection should not be cleaned by:

 # Pseudomonal infection should not be cleaned by:

A. Dettol

B. Hypochlorite

C. Chlorine

D. Betadine

The correct answer is A. Dettol.

Pseudomonas aeruginosa is heat-labile bacteria, readily killed at 55 degrees celcius in 1 hour. It is also highly susceptible to acid, silver salts, 2% alkaline glutaraldehyde, and disinfectants. 

Due to its sensitivity to silver salts, silver sulphonamide compounds have been used as topical cream in burns. However, Pseudomonas aeruginosa is very strongly resistant to common antiseptics and disinfectants, such as chloroxylenol (dettol), hexachlorophane and quartenary ammonium compounds. Indeed, selective media have been devised for isolation of Pseudomonas aeruginosa incorporating dettol or cetrimide. 

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Extractions can be done in ANUG patients after:

 # Extractions can be done in ANUG patients after:

A. At first appointment

B. 4 weeks

C. 4 months

D. 1 week

The correct answer is B. 4 weeks.

Unless an emergency exists, extractions and periodontal surgeries are postponed until the patient has been symptom free for a period of 4 weeks to minimize the likelihood of exacerbation.

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Mouthwash used in ANUG is:

 # Mouthwash used in ANUG is:

A. Chlorhexidine

B. Normal saline

C. Hydrogen peroxide

D. Stannous fluoride

The correct answer is C. Hydrogen peroxide.

At the first visit, treatment should be aimed at reducing the microbial load and remove the necrotic tissue. Topical anesthetics and antibiotic regimen should be recommended. Patient should be instructed to to rinse mixture of 3% hydrogen peroxide and warm water once every two hours. For the third visit, hydrogen peroxide rinses discontinued and chlorhexidine mouthwash is to be continued 2 to 3 weeks. 

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