Articular disc of TMJ is

 # Articular disc of TMJ is:

A. Fibrocartilaginous

B. Bony

C. Hyaline cartilage

D. Elastic cartilage

The correct answer is A. Fibrocartilaginous

The unique feature of the TMJ is the articular disc. The disc is composed of fibrocartilaginous tissue which is positioned between the two bones that form the joint. There is neither innervation nor vascularization within the central portion of the articular disc. Articular disc is oval fibrous plate with concavoconvex superior surface and concave inferior surface. It divides joint into upper and lower compartments. Upper compartment permits gliding and lower permits gliding as well as rotatory movements. 

CLICK HERE FOR MORE MCQs

Sublingual salivary gland is located:

 # Sublingual salivary gland is located superior to:

A. Genioglossus

B. Hyoglossus

C. Mylohyoid

D. None of the above

The correct answer is C. Mylohyoid.

Sublingual salivary gland lies superior to mylohyoid and lateral to the genioglossus muscle. Its duct opens directly into floor of mouth on the summit of sublingual fold.

CLICK HERE FOR MORE MCQs

Opening of submandibular gland duct:

 # The opening of submandibular gland duct into oral cavity is at:

A. Maxillary Second molar

B. Mandibular third molar

C. Dorsum of tongue

D. Sublinugual caruncle

The correct answer is D. Sublingual caruncle.

Submandibular duct or Warthin's duct is 5 cm long, emerges from submandibular gland and in its course runs on the hyoglossus between lingual and hypoglossal nerve and opens at the sublingual papilla at the side of frenum of tongue.

CLICK HERE FOR MORE MCQs

Ideal class V restoration

 # For an Ideal class V restoration on a mandibular premolar, which of the following is the MOST IMPORTANT factor when choosing a restorative material?

A. Ease of manipulation of material

B. Esthetics

C. Compressive strength

D. Reaction of gingival tissue

The correct answer is D. Reaction of gingival tissue.

Restorative materials that do not induce gingival tissue reaction should be considered when selecting the proper restorative material for class V restorations.

Esthetics are not a factor because the class V restoration in question is placed at the cervical area of a mandibular premolar and is not within the esthetic zone.

Compressive strength is only required for occlusal restorations or those cavities which are under heavy occlusal load.

CLICK HERE FOR MORE MCQs