Denture Cleaning Powder

# Which of the following is the main ingredient of denture cleaning powder or tablets?
a) Hydrogen peroxides
b) Detergents
c) Sodium perborates
d) Alkaline compounds

The correct answer is C. Sodium Perborates.

All the denture cleansing powder and tablets contain detergent, flavouring agent, alkaline compounds and sodium perborate. The main component is sodium perborate. It decomposes in water to form a peroxide solution which inturn breaks down to liberate oxygen. It is this oxygen bubbles that remove the debris on the denture surfaces.

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Iron carbide in Orthodontic Wire

# The iron carbide in orthodontic wire is in the form of:
a) Martensite
b) Ferrite
c) Carbide
d) Austenite

The correct answer is D. Austenite.

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Infantile Swallowing

# The positioning of tongue in infantile swallowing is:
a) Posterior
b) Medial
c) Lateral
d) Anterior

The correct answer is D. Anterior.

Tongue thrusting, simply defined, is the habit of thrusting the tongue forward (anterior) against the teeth or in between while swallowing. It is an infantile pattern of swallowing that has been retained by an individual.

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Quick Review of Dental Anatomy and occlusion MCQs

# The only symbolic tooth numbering system is:
A. FDI System
B. Palmer system
C. Universal system
D. ADA system

# Resorption in primary central incisors begin at:
A. 2 years
B. 3 years
C. 4 years
D. 5 years