Dentosphere : World of Dentistry

 # Set white MTA can be dissolved by adjunct solution of: A. Carbonic acid B. Normal saline C. Sodium hypochlorite D. Hydrogen peroxide The correct answer is A. Carbonic acid.  Carbonic acid can be effectively used as an adjunct to set white MTA even after 21 days. CLICK HERE FOR MORE MCQs

 Principal Indications for Prenatal Diagnosis by lnvasive Testing - Advanced maternal age (greater than 35 years) - Previous child with de novo chromosomal aneuploidy - Presence of structural chromosome abnormality in one of the parents - Family history of a genetic disorder that may be diagnosed or ruled out by biochemical or DNA analysis - Family history of an X-linked disorder for which there is no specific prenatal diagnostic test - Risk of a neural tube defect (first degree relatives of patients with neural tube defects) - Fetal abnormalities are suspected on Maternal serum screening and ultrasound examination 

 # Which of the following is not a sporicidal disinfectant? A. Glutaraldehyde B. Formaldehyde C. Ethylene oxide D. Benzalkonium chloride The correct answer is D. Benzalkonium chloride. Sporicidal agents are:  E- Ethylene oxide F- Formaldehyde G- Glutaraldehyde H- Halogens  Benzalkonium chloride is quartenary ammonium antiseptic which is not sporicidal. Only aldehydes, halogens and ethylene oxide are sporicidal disinfectants.  Formaldehyde is active against the amino group in the protein molecule. In aqueous solutions, it is marked bactericidal, sporicidal and virucidal. It is used to preserve anatomical specimens and for destroying anthrax spores in hair and wool. 10% formalin containing 0.5% sodium tetraborate is used to sterilize clean metal instruments.  Glutaraldehyde has an action similar to that of formaldehyde. It is especially effective against the tubercle bacilli, fungi and viruses.  Ethylene oxide is a colorless liquid with a boiling point of 10....

# 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 CLICK HERE FOR MORE MCQs

 # 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.  CLICK HERE FOR MORE MCQs

 # 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. CLICK HERE FOR MORE MCQs

 # 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.  CLICK HERE FOR MORE MCQs