Rule of Ten is for:

 # Rule of Ten is for:

A. Pheochromocytoma

B. MEN-I syndrome

C. Adrenal hyperplasia

D. Parathyroid

The correct answer is A. Pheochromocytoma.

Pheochromocytoma:- 

For diagnosis and management of this disease classic "rule of tens is applicable." 

• 10% of these neoplasms occur in children 

• 10% of these neoplasms associated with familial syndromes 

• 10% of sporadic cases of these neoplasms are bilateral 

• 10% of these neoplasms are extra-adrenal 

• 10% of these neoplasms are malignant 

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Supporting cells of taste buds are called as:

 # Supporting cells of taste buds are called as:

A. Sustentacular cells

B. Taste cells

C. Von Ebner cells

D. Acini

The correct answer is A. Sustentacular cells.

The taste bud is composed of about 50 modified epithelial cells, some of which are supporting cells called sustentacular cells and others of which are taste cells. New taste sensation described in some texts is UMAMI. Its receptor is glutamate receptor - mglu R4 

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Matrix vesicles are derived from:

 # Matrix vesicles are derived from:

A. Elastin fibres

B. Collagen

C. Osteoblast

D. Inflammatory cells

The correct answer is C. Osteoblast.

The term matrix vesicles (MV) refers to small (20-200 nm) spherical bodies observed in the pre-mineralized matrix of dentin, cartilage and bone. They appear to be bounded by a lipid bilayer, and are often found associated with small crystals of calcium phosphate mineral. They are derived from the plasma membrane of mineral forming cells i.e. chondrocytes, osteoblasts, odontoblasts. The matrix vesicles promotes the formation of apatite by increasing the concentration of alkaline phosphatase that play a role in calcification. 

Reference: Orban's

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Discoloration of a denture constructed from cold cure acrylic resin is due to:

 # Discoloration of a denture constructed from cold cure acrylic resin is due to: 

A. Absorption of oral fluids 

B. PH changes in saliva 

C. Leaching out of tertiary amines 

D. Leaching out of excess monomer 

The correct answer is C. Leaching out of tertiary amines.

The color stability of chemically activated resins is generally inferior to the color stability of heat activated resins. This property is related to the presence of tertiary amines with in the cold cure resins, which are highly susceptible to oxidation. 

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