Tooth supporting structures

Question 1

Gingival unit contain what

Answer 1

Free gingiva, attached gingiva, alveolar mucosa

Question 2

Attachment unit contain what

Answer 2

cementum, alveolar bone, periodontal ligament

Question 3

Masticatory mucosa function

Answer 3

Absorb the pressure while grinding the food

Question 4

Masticatory mucosa histology

Answer 4

cover by thick epithelial and keratinized cells

Question 5

Lining mucosa makes up what

Answer 5

Alveolar mucosa

Question 6

Where Free gingiva start and end

Answer 6

extends from gingival margin to the base of gingival sulcus

light pink

0.5-2mm in depth

Question 7

Gingival sulcus

Answer 7

space between the free gingiva and tooth

Healthy sulcus is less than 2.5mm in depth

Question 8

Gingival papilla

Answer 8

free gingiva located in the triangular interdental space

Sharp in anterior teeth

Blunt in posterior teeth

Question 9

Shape of gingival papilla/interdental gingiva is affected by what?

Answer 9

Location of the contact area of the adjacent teeth

Shape of the interproximal surfaces of the adjacent teeth

CEJ of the adjacent teeth

Question 10

Inner portion of gingival sulcus

Answer 10

Lined with nonkeratinized epithelium

Question 11

Outer portion of gingival sulcus

Answer 11

Covered with keratinized epithelium

Question 12

Where attached gingiva begins?

Answer 12

Base of gingival sulcus (gingival groove)

Question 13

Attached gingiva

Answer 13

Extends apically from the base of the sulcus and attached to bone and cementum by a dense network of collagenous fibers

Question 14

Colour of gingiva

Answer 14

varies from light to dark pink
may contain pigment
correlating to skin pigmentation

Question 15

*Sharpey’s fibers

Answer 15

The end of the periodontal fibers that are embedded in alveolar bone and cementum is called sharpey fibers

extend from cementum to papillary area of the gingiva

pass out from cementum in small bundles

Question 16

Transseptal group (fibers) and it function

Answer 16

Travels completely across interproximal space and attaches to adjacent tooth

Bind one tooth to another

Question 17

What all the gingival fibers do

Answer 17

keep gingiva closely attached to tooth surface

prevent free gingiva peeled away

resist gingival recession

prevent apical migration of the epithelial attachment

Question 18

Where Alveolar mucosa join the attached gingiva

Answer 18

mucogingival junction

Question 19

Periodontal ligament and it function

Answer 19

tissue that surrounds the roots of the teeth connects them to alveolar bone

acts as a suspensory mechanism to prevent the root and bone abrading each other

Act as a hammock of live tissue whose fibers cushion the impact between tooth and bone on the exertion of pressure

Question 20

Alveolar BONE

Answer 20

thin covering of compact bone that surrounds the teeth

has many small openings through which blood vessels, nerves and lymphatic vessels pass

Question 21

Radiographically name for alveolar bone

Answer 21

Lamina dura

Question 22

Function of attachment apparatus (Cementum, PDL, alveolar bone)

Answer 22

1) Supportive- maintain the support for the tooth in the
bone and prevent its movement

2) Nutritive

3) Formative- replace cementum, periodontal ligament and
alveolar bone, accomplished by specialized
cells call cementoblast, fibroblast and osteoblasts

4) Sensory

Question 23

Different between cellular and acellular cementum

Answer 23

Cellular Acellular

Cementoblast embedded free of
in the cementum embedded cementoblast

Covers apical portion of Always covers the cervical
the root and sometime third of the root and
form over acellular sometimes extends over
cementum almost all the root except
apical portion

Question 24

Both types of cementum contain what?

Answer 24

Sharpey’s fibers of periodontal ligament (PDL)

Question 25

Bundle bone

Answer 25

Applies when numerous layers of bone are added to the socket wall

Question 26

Periodontal ligament fibers are arranged into 5 groups

Answer 26

Alveolar crest group
Horizontal group
Oblique group
Apical group
Interradicular group

Question 27

Alveolar crest group

Answer 27

fibers extending from the cervical area of the tooth to alveolar crest

Question 28

Horizontal group

Answer 28

Fibers running horizontally from the tooth to alveolar bone

Question 29

Oblique group

Answer 29

Fibers running obliquely from the cementum to the bone

Question 30

Apical group

Answer 30

Fibers radiating apically from the tooth to the bone

Question 31

Interradicular group

Answer 31

Periodontal fibers that only present in root between multirooted teeth

Question 32

What will periodontal fibers do if there is a pressure exerted on mesial surface

Answer 32

periodontal fibers on distal surface will compressed to allow more space between tooth and bone

Question 33

Two forces are active within the mouth allow the movement of the tooth. What are the two forces?

Answer 33

Mesial drift- Allows tooth move forward within the oral cavity, thus closing the space lost from interproximal wear

Active eruption force- tooth migrate occlusally until it occludes with an antagonist (maxilla and mandibular)

Question 34

List 4 supporting structure involved to maintain the tooth intact in the tooth socket

Answer 34

1) Gingival tissues
2) Alveolar bone
3) Cementum
4) Periodontal Ligament (PDL)