Question: Incremental lines of Retzius appear_____________?

• 1. As lines in the enamel running at right angles to the enamel surface
• 2. As lines in the dentin running at right angles to the dentino-enamel junction
• 3. In enamel and follow the apposition pattern
• 4. In dentin and follow the appositional pattern

Question: Enamel spindles are formed by______________?

• 1. Cracks
• 2. Ameloblasts
• 3. Odontoblasts
• 4. Hypocalcified rods

Question: The small ridges, perikymata, seen on facial surfaces of canines are the result of_____________?

• 1. Hyperplasia
• 2. Hypoplacification
• 3. Normal development
• 4. Interstitial development

Question: Ameloblasts is______________?

• 1. A cell from which tooth enamel is formed:
• 2. A tissue from which tooth erupts
• 3. A tumour of the jaw
• 4. Pertaining to dentin

Question: Shape of enamel rod is______________?

• 1. Key hole or paddle shaped
• 2. Square
• 3. Round
• 4. None of the above

Question: Moth eaten appearance of of enamel is seen in____________?

• 1. Odontodysplasia
• 2. Amelogenisis stage
• 3. Desmolytic stage
• 4. Mottled enamel

Question: Hertwig’s root sheath is formed from______________?

• 1. Stratum inter medium
• 2. Stellate reticulum
• 3. Outer enamel epithelium
• 4. Cervical loop

Question: Thin leaf like structures that extend from enamel surface in to DEJ are____________?

• 1. Enamel spindles
• 2. Enamel lamella
• 3. Enamel tufts
• 4. Perikymata

Question: Which of the following statement is correct_________________?

• 1. In cross sections enamel rods appear hexagonal and resembles fish scales
• 2. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically
• 3. The apatite crystals are parallel to bodies and deviate 65° from the tails
• 4. All of the above

Question: Length of enamel rods is_____________?

• 1. Greater than the thickness of enamel
• 2. Less than the thickness of enamel
• 3. Equal to the thickness of enimal
• 4. None of the above