Njds: Histology - Gingiva

Front 1

What is the col region?

Back 1

The region found in the interproximal areas of posterior teeth where the interdental papilla shows a central concavity between the facial and lingual papillary apices; characterized by a thin non-keratinized epithelium with inflammatory cells within its lamina propria

Front 2

Describe the formation of the dentogingival junction

Back 2

 the connective tissue overlying the reduced enamel epithelium (REE) and underlying the oral epithelium begins to degenerate.
 the outer layer of REE and the basal layer of the oral epithelium proliferate into the degraded connective tissue, eventually fusing to form a thick epithelial mass over the crown of the tooth. This structure is known as the epithelial cuff (apical region = future dentogingival junction and the remainder becomes the sulcular epithelium)
 As the cusp tip enters the oral cavity, the reduced ameloblasts maintain connection to the tooth through a basal lamina by way of hemidesmosomes. This connection is called the primary epithelial attachment.
 The reduced ameloblasts undergo morphologic change to squamous epithelial cells. The cells of the outer REE change in shape to be come basal cells. REE gives rise to the junctional epithelium.

Front 3

Name the 4 anatomic components of the gingiva

Back 3

Free gingival, attached gingival, interdental gingiva, and dentogingival junction

Front 4

What is gingiva?

Back 4

Gingiva is the component of the oral mucosa that surfaces the coronal portion of the alveolar processes and surrounds the cervical areas of the teeth.

Front 5

What type of mucosa does the gingiva consist of?

Back 5

masticatory mucosa

Front 6

What three structures make up the gingiva?

Back 6

epithelium, lamina propria, mucoperisoteum

Front 7

What type of epithelium is the gingival composed of?

Back 7

thick stratified epithelium that is either orthokeratinized or parakeratinized

Front 8

Decribe the structure of the lamina propria.

Back 8

numerous elongated, thin connective tissue papillae

Front 9

What is the mucoperiosteum?

Back 9

The direct attachment of the lamina propria to the underlying periosteum of the alveolar process

Front 10

The free gingiva is bordered (coronally, apically, and on its inner surface) by which three areas?

Back 10

coronally – free gingival margin

apically- free gingival groove

inner surface – sulcular epithelium

Front 11

How does the epithelium of the gingival sulcular differ from that facing the oral cavity?

Back 11

It is thinner, lacks well-developed epithelial ridges, and is not keratinized (although the outer surface of the free gingival may sometimes be non-keratinized)

Front 12

What is the range of gingival sulcus depth?

Back 12

.5 - 3mm (anything greater will indicate gingival or periodontal disease)

Front 13

Where is attached gingiva found?

Back 13

Lies between the free gingival groove and the mucogingival junction.

Front 14

What region is found within the attached gingiva that exhibits surface stippling?

Back 14

Interdental groove

Front 15

What does the interdental gingival consist of?

Back 15

Interdental papillae which are wedge-shaped mucosal projections that extend to the contact points of adjacent teeth

Front 16

What is the function of the dentogingival junction?

Back 16

Attach the gingiva to the tooth

Front 17

What type of epithelium does the dentogingival junction consist of?

Back 17

Junctional epithelium

Front 18

What is the dentogingival junction permeable to?

Back 18

Water, high-molecular weight substances, and inflammatory cells

Front 19

Name the five major fiber groups composing the gingival ligament

Back 19

1)Dentogingival group

2)Alveologingival group

3)Circular group

4)Dentoperiosteal group

5)Transseptal fiber system

Front 20

Which fiber group of the gingival ligament is the most numerous and extends between the cervical cementum to the lamina proria of the free and attached gingiva

Back 20

Dentogingival group

Front 21

Where is the alveologingival group found?

Back 21

It extends from the alveolar crestal bone to the lamina propria of the free and attached gingiva

Front 22

Which fiber group of the gingival ligament is a band of collagen fibers that encircles the crown of the tooth and intermingles with the other fiber groups in the free gingiva and also helps to hold the free gingiva against the tooth surface?

Back 22

circular group

Front 23

Where is the dentoperiosteal group located?

Back 23

It is found running from the cervical cementum to the periosteum of the alveolar crest, where they then extend to the vestibular surfaces of the alveolar bone

Front 24

Where does the transseptal fiber system originate?

Back 24

It originates on the cervical cementum of the tooth, and then span the alveolar crest to insert on the cervical cementum of the adjacent tooth. Taken together, the transseptal ligaments constitute the interdental ligament and connect all the teeth in the arch.

Front 25

What role does the interdental ligament play?

Back 25

It plays a role in the mesial drift of teeth.