MDS PREP
Greatest amount of cranial growth occurs by
1) Birth to five years
2) 5-6 years
3) 6-7 years
4) 7-10 years
Orthodontics
Answer: 1
The number of roots to be formed is determined by
1) Dental lamina
2) Diaphragm of epithelial sheath of Hertwig
3) Hammock ligament
4) Dental papilla
Periodontics
Answer: 2
It is difficult to obtain local infiltration anaesthesia in the presence of inflammation/infection because of
1) A decreased pH
2) Increased vascularity
3) Oedema
4) Pain
Oral Surgery
Answer: 1
Chelating agent contraindicated in iron and cadmium poisoning
1) Penicillamine
2) Des ferroxamine
3) EDTA
4) BAL
Pharmacology Answer: 4
Dimercaprol (British antilewisite; BAL)
1. Poisoning by As, Hg, Au, Bi, Ni, Sb: it is administered i.m., 5 mg/kg stat, followed by 2-3 mg/kg every 4 – 8 hours for 2 days, then once or twice a day for 10 days. It is partly oxidized and glucuronide conjugated, but mainly excreted as such in 4 – 6 hours. Earlier the treatment is instituted, the better it is. Because the dimercaprolmetal complex dissociates faster in acidic urine and the released metal can damage the kidney, urine is alkalinized during dimercaprol therapy.
2. As an adjuvant to Cal. Disod. Edentate in lead poisoning.
3. As an adjuvant to penicillamine in Cu poisoning and in Wilson’s disease – 300 mg/day i.m. for 10 days every second month.
It is contraindicated in iron and cadmium poisoning, because the dimercaprol-Fe and dimercaprol-Cd complex is itself toxic.