Remineralization of Tooth

# The pH at which the remineralisation of damaged tooth structure occurs is said to be:
 A. 5.5
 B. 2.5
 C. 3.5
 D. 6.2

The correct answer is A. 5.5.

5.5 for 20 to 50 minutes is called as critical pH below which the tooth demineralizes and above remineralization occurs.

The critical pH for root surface demineralization is approximately 6 to 6.7

CLICK HERE FOR MORE MCQs

Absolute Contraindication for extraction of teeth

# An absolute contraindication for extraction of teeth is:
A. Hypertension
B. Myocardial infarction
C. Thyrotoxicosis
D. Central hemangioma 

The correct answer is D. Central hemangioma.

Hemorrhagic lesions: There are two entities that constitute absolute contraindications to exodontics: arteriovenous or sinusoidal aneurysms and central hemangiomas. (KRUGER)

Extraction of a tooth associated with a central hemangioma results in profuse bleeding and death of patients.

Relative contraindications:
- six months after a myocardial infarction
- extraction of teeth in previously irradiated areas
- presence or suspicion of hemangioma
- uncontrolled diabetes mellitus
- acute blood dyscrasias
- untreated coagulopathies
- necrotizing ulcerative gingivitis
- Adrenal insufficiency
- Thyrotoxicosis

CLICK HERE FOR MORE MCQs

Wound tissue and repair

# The word 'Patient' is derived from Latin word 'patiens' which means:
A. Disease
B. Suffering
C. Treatment
D. To cure

# "Sign of compression" is characteristically seen in:
A. Lipoma
B. Hernia
C. Vascular swelling
D. Sebaceous cyst

MCQs on Cardiopulmonary Resuscitation and Airway Maintenance

# The primary airway hazard for an unconscious patient in a supine position is:
A. Tongue obstruction
B. Bronchospasm
C. Laryngospasm
D. Aspiration

# Among the following, which is the rescue breathing in adult?
A. 6 times/min
B. 18 times/min
C. 12 times/min
D. 24 times/min