# Lymphatic drainage of TMJ is mainly to:
A. Submandibular nodes
B. Submental nodes
C. Deep cervical nodes
D. Parotid nodes
The correct answer is D. Parotid nodes.
Nerve supply of Capsule of TMJ:
# Which of the following supplies capsule of TMJ?
A. Facial nerve
B. Auriculotemporal nerve
C. Branch of maxillary nerve
D. First cervical nerve
The correct answer is B. Auriculotemporal nerve.
Sensory nerve supply: Sensory innervation of the TMJ is derived from the auriculotemporal and masseteric branches of V3 (otherwise known as the mandibular branch of the trigeminal nerve).
Blood supply of TMJ: Its arterial blood supply is provided by branches of the external carotid artery, predominantly the superficial temporal branch. Other branches of the external carotid artery, namely, the deep auricular artery, anterior tympanic artery, ascending pharyngeal artery, and maxillary artery, may also contribute to the arterial blood supply of the joint.
Dynamic receptors of the TMJ joint:
# Which of the following are dynamic receptors of the TMJ joint?
A. Ruffini endings
B. Pacinian corpuscles
C. Golgi tendon
D. Free nerve endings
The correct answer is B. Pacinian corpuscles
Pacinian corpuscles are dynamic mechanoreceptors which accelerate movement during reflexes.
The receptors for specific mechanics of proprioception:
Ruffini endings- static mechanoreceptors which position the mandible
Pacinian corpuscles- Dynamic mechanoreceptors which accelerate movement during reflexes
Golgi tendon organs- Static mechanoreceptors for protection of ligaments around the temporomandibular joint
Free nerve endings- Pain receptors for protection of the temporomandibular joint itself
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.
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.
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.
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.
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