Supporting Structures of the Mandible

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Questions and Answers

What is the primary stress-bearing area of the mandible?

Retromolar pad

Mental foramen

Torus mandibularis

Buccal shelf of bone (correct)

Where is the mental foramen located?

At the posterior end of the lower ridge

Between the roots of the premolars (correct)

Between the roots of the molars

On the internal surface of the mandible

What is the role of the genial tubercles in the mandible?

They support upper jaw stability.

They house the mental nerve.

They provide attachment for muscles. (correct)

They are part of the buccal shelf.

Which structure is located at the posterior end of the lower ridge?

Retromolar pad Signup and view all the answers

The external oblique ridge extends in which direction on the mandible?

Upward and backward Signup and view all the answers

What anatomical feature transmits the mental nerve and vessels?

Mental foramen Signup and view all the answers

What occurs to the mental foramen during resorption?

It moves upwards. Signup and view all the answers

Which of the following structures contains mucous glands and is located at the posterior end of the mandibular ridge?

Retromolar pad Signup and view all the answers

What is the significance of the pterygomandibular raphé in denture construction?

It indicates the distal extent of the maxillary denture. Signup and view all the answers

What features of the tongue are important to consider in denture construction?

Its mobility and involvement in speech and swallowing. Signup and view all the answers

Which structure is NOT a limiting structure of the lower denture?

Palatoglossus muscle Signup and view all the answers

What physical phenomenon must be considered when arranging teeth on a mandibular denture?

The movements of the tongue. Signup and view all the answers

Which statement accurately describes the buccal frenum?

It is a fold of mucous membrane in the premolar area. Signup and view all the answers

How does the masseter muscle influence the design of a mandibular denture?

The buccal flange should converge medially. Signup and view all the answers

What might occur with excessive resorption of the mandible in relation to the sublingual salivary gland?

The gland may bulge superiorly above the mandible. Signup and view all the answers

Which area is closely related to the activities of the buccinator muscle in denture construction?

The buccal vestibule. Signup and view all the answers

Study Notes

Supporting Structures of the Mandible

Fibrous Connective Tissue Covering Alveolar Ridge: Covers the crest of the ridge, thin, not firmly attached, especially in the lower ridge; Affects denture stability.
External Oblique Ridge: Extends upwards and backwards on the external surface of the mandible from the mental foramen along the anterior border of the ramus.
Buccal Shelf Of Bone: Bounded medially by the residual ridge and laterally by the external oblique ridge; Primary stress-bearing area because it is bounded by these two ridges.
Mental Foramen: Located on the external surface between the premolar roots; Transmits mental nerve and vessels that supply the lower lip and chin.
Mylohyoid Ridge (Internal Oblique Ridge): Extends downward and forward from the 3rd molar area; Attachment for the mylohyoid muscle; Can be removed surgically if sharp and prominent.
Torus Mandibularis: A bony overgrowth on the lingual surface of the mandible.
Genial Tubercles: Located on the inner surface of the mandible in the symphysis region; Normally not palpable; They can be located on the crest of the ridge in extreme bone resorption, requiring relief for dentures.
Retromolar Pad: Pear-shaped area of mucous membrane at the posterior end of the lower ridge; Contains mucous glands, temporalis tendon, and fibers of the buccinator and superior constrictor muscles.
Tongue: Located in the floor of the mouth; Important for denture construction due to its mobility and involvement with swallowing and speech.

Limiting Structures of the Lower Denture

Frena: Fold of mucous membrane, like lips and cheeks, that moves as the mouth moves.
Vestibules:
- Buccal Vestibule: The denture in this area is related to the buccinator muscle.
- Distobuccal Area (Masseter Influencing Area): Related to the distobuccal corner of the lower denture; The buccal flange must converge medially to avoid denture displacement when the masseter muscle contracts.
Distolingual Area: The denture is related to the tongue in this area.
Lingual Pouch: Posteriorly: Palatoglossus muscle; Anteriorly: Mylohyoid muscle; Medially: The tongue; Laterally: Medial aspect of mandible and most anterior border of medial pterygoid muscle.
Sublingual Gland Area: With excessive resorption of the mandible, the gland may bulge superiorly above the body of the mandible.

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Description

This quiz focuses on the various supporting structures of the mandible, including the fibrous connective tissue, external oblique ridge, and buccal shelf of bone. It explores their anatomical significance and impact on denture stability. Test your knowledge about the key features and functions related to the mandible.