intro dentistry 1-10 Quiz

Chemical composition of enamel:

• 95% inorganic, 2% organic, 3% water

• 60% inorganic, 30% organic, 10% water

• 70% inorganic, 20% organic, 10% water.

Sign of crown curvature 'reverse'

• at the first premolar of the maxilla

• at the second premolar of the maxilla

• at the second premolar of the mandible.

Permanent first molars erupt at:

• 5-6 years

• 9-10 years

• 12-13 years old.

The Carabelli tubercle is located:

• on the palatal surface of the maxillary first molar

• on the chewing surface of the first molar of the mandible

• on the palatal surface of the maxillary first premolar.

The five-tubercles shape of the chewing surface is characteristic:

• for the second molar of the mandible

• for the first molar of the mandible

• for maxillary first molar

Sulcus mylohyoideus is an anatomical formation:

• upper jaw

• lower jaw

• internal base of the skull

Chemical composition of tooth cement:

• 70% inorganic, 20% organic, 10% water

• 95% inorganic, 2% organic, 3% water

• 60% inorganic, 30% organic, 10% water

Retzius lines are:

• tangential dentin fibers

• lines reflecting the periodicity of calcification processes

• alternating parazon and diazon on longitudinal sections of enamel

The central permanent incisors erupt at:

• 7-8 years

• 8-9 years

• 9-10 years

How are the enamel prisms located in the area of the masticatory cusps?

• perpendicular to the longitudinal axis of the tooth

• radially

• parallel to the longitudinal axis of the tooth