Interns Prosthodontics MCQs Exam

For metal ceramic restoration, investment material of choice

• Gypsum Bonded Investment
• Phosphate bonded investment
• Silicate bonded
• Gas-Air torch

Which of the following is used to remove investment from casting

• Hydrofluoric Acid
• Hydrochloric acid
• Sulphuric acid
• Nitric acid

Rough poorly polished area of pontic causes

• Halitosis
• Discomfort
• Chronic inflammation of ridge tissue
• All of above

Metal ceramic interface should be

• At centric contacts
• 0.5 mm away from centric contacts
• At least 1 mm away
• at least 1.5 mm

Metal ceramic junction should be

• 45°
• 60°
• 90°
• 120°

Minimum thickness of base metal alloy for metal ceramic

• 0.2mm
• 0.3mm
• 0.4mm
• 0.5mm

Spacer thickness for custom tray in FPD

• 0.5-0.8mm
• 1-2mm
• 2-3mm
• 4-5mm

Following medications can be used to control saliva except

• Atropine
• Dicyclomine
• Doxycycline
• Clonidine

Zinc phophate cement acts by

• Adhesion
• Adding frictional resistance
• Contacting the tooth
• increasing the film thickness

Dry cutting of non vital tooth should be avoided for

• Pulpul health
• Prevent microfractures of enamel
• prevent dehydration of dentin
• All of above