Ameloblasts is______________? A. A cell from which tooth enamel is formed: B. A tissue from which tooth erupts C. A tumour of the jaw D. Pertaining to dentin

Shape of enamel rod is______________? A. Key hole or paddle shaped B. Square C. Round D. None of the above

Moth eaten appearance of of enamel is seen in____________? A. Odontodysplasia B. Amelogenisis stage C. Desmolytic stage D. Mottled enamel

Hertwig’s root sheath is formed from______________? A. Stratum inter medium B. Stellate reticulum C. Outer enamel epitheliumD. Cervical loop

Thin leaf like structures that extend from enamel surface in to DEJ are____________? A. Enamel sdlesB. Enamel lamella C. Enamel tufts D. Perikymata

Which of the following statement is correct_________________? A. In cross sections enamel rods appear hexagonal and resembles fish scales B. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically C. The apatite crystals…

Length of enamel rods is_____________? A. Greater than the thickness of enamel B. Less than the thickness of enamel C. Equal to the thickness of enimal D. None of the above

Specific gravity of enamel is_____________? A. 2.8 B. 3.8 C. 4.8 D. 2.3

The type of fibrous element in enamel is_____________? A. Tono filamentB. Keratin like fibre C. Collagen fibre D. Vimentin filament

Which of the following tissues have no reparative capacity______________? A. Enamel B. Dentin C. Cementum D. Periodontal ligament