The stock tray should be _______ mm larger than the ridge.

 # In primary impression, the stock tray should be _________ mm larger than ridge. 

A. 2 mm 

B. 4 mm

C. 6 mm

D. 8 mm

The correct answer is C. 6 mm.

If the tray is too large, it will distort the tissues around the borders of impression. If it is too small, the border tissues will collapse inward onto the residual ridge and thus reduce the support for the dentures.

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The Bennett movement exerts its greatest influence in:

 # The Bennett movement exerts its greatest influence in:

A. Lateral movement

B. Protrusive movement 

C. Opening movement

D. Closing movement

The correct answer is A. Lateral movement.

Bennett movement is a lateral jaw movement demarcated by movement of balancfng side condyle. It is brought about by lateral pterygoid as it is attacked to neck of condyle and the capsule.

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Minimum thickness of metal coping of base metal alloy is:

 # The minimum thickness of metal coping of base metal alloy is:

A. 0.1 mm

B. 0.2 mm

C. 0.3 mm

D. 0.4 mm

The correct answer is B. 0.2 mm.

For gold alloys, the minimum thickness of coping should be: 0.3 mm

For base metal alloys, the minimum thickness of coping should be: 0.2 mm

Minimum thickness of porcelain in metal ceramic restoration should be: 0.7 mm

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Which has common role in osteoblast, fibroblast and cementoblast?

 # Which has common role in osteoblast, fibroblast and cementoblast?

A. Osteopontin

B. Osteocalcin

C. Osteogenin

D. Bone Sialoprotein

The correct answer is A. Osteopontin.

Osteopontin (OPN) is a highly phosphorylated sialoprotein that is a prominent component of the mineralized extracellular matrices of bones and teeth. 

Osteopontin (OPN), also known as bone sialoprotein I (BSP-1 or BNSP), early T-lymphocyte activation (ETA-1), secreted phosphoprotein 1 (SPP1), 2ar and Rickettsia resistance (Ric), is a protein that in humans is encoded by the SPP1 gene (secreted phosphoprotein 1). 

Osteopontin is biosynthesized by a variety of tissue types including fibroblasts preosteoblasts, osteoblasts, osteocytes, odontoblasts, some bone marrow cells, hypertrophic chondrocytes, dendritic cells, macrophages, smooth muscle, skeletal muscle myoblasts, endothelial cells and extraosseous (non-bone) cells in the inner ear, brain, kidney, deciduum and placenta. 

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