Periodontium: Parts of the Tooth and its Supporting Structures

Question 1

What does Periodontium mean?

Answer 1

Structures that surround, support, and are attached to the teeth.

Question 2

What are the four tooth tissue? Identify which ones are hard or soft

Answer 2

Hard tissue: enamel, dentin, cementum,

Soft tissue: dental pulp

Question 3

What forms on the outer surface of the atomic crown?

Answer 3

Enamel.

Question 4

What is the thickest over the tip of the crown and thins at the cervical line?

Answer 4

Enamel

Question 5

T/F The colour of enamel varies with its thickness and mineralization.

Answer 5

True. The thicker the enamel, the whiter the tooth and increased mineralization causes increased translucency.

Question 6

What tissue is the hardest in the human body, where its chemical composition is 96% in inorganic matter and 4% organic matter and water?

Answer 6

Enamel. This hard surface is resistant to wear from chewing forces and bacteria and acid attack

Question 7

What dental tissue forms the main body of the tooth and is wrapped in an envelope of enamel on the crown and cementum on the root?

Answer 7

Dentin.

Question 8

What tissue is hard, dense, and calcified, and not as hard as enamel but harder than cementum or bone?

Answer 8

Dentin.

Question 9

What soft tissue is 70% inorganic and 30% organic matter and water?

Answer 9

Dentin.

Question 10

What tissue has the amazing ability to add to itself?

Answer 10

Dentin.

Question 11

What tissue is formed throughout the pulp chamber after eruption?

Answer 11

Secondary Dentin.

Question 12

What tissue is laid down as a protective measure against caries or trauma?

Answer 12

Reparative dentin. (tertiary dentin)

Question 13

What tissue is a bonelike substance that covers the root with a composition is 45-50% inorganic and 50-55% organic matter?

Answer 13

Cementum.

Question 14

Name the tissue that’s function is to provide a medium for the attachment of the tooth to the alveolar bone and this anchor protects the tooth.

Answer 14

Cementum.

Question 15

What tissue is thin at the cervical line and thickens closer to the apex?

Answer 15

Cementum.

Question 16

The union of the enamel and cementum is the ________.

Answer 16

CEJ, Cementoenamel junction.

Question 17

The union of the dentin and cementum is the _________.

Answer 17

DEJ, DEntinocemental junction.

Question 18

What type of cementum covers the apical third of the tooth and can reproduce itself through cells called cementoblasts?

Answer 18

Cellular cementum.

Question 19

What type of cementum covers the entire anatomic root?

Answer 19

Acellular cementum.

Question 20

What tissue is composed of blood vessels, lymph vessels, connective tissue, nerve tissue and dentin-forming cells call odontoblasts?

Answer 20

Dental pulp.

Question 21

What tissue is surrounded by dentin and the walls of the pulp cavity are lined with odontoblasts which form dentin?

Answer 21

Dental pulp.

Question 22

The dental pulp is divided into a pulp chamber and pulp canals. Together these are called ______.

Answer 22

Pulp cavity.

Question 23

In the pulp cavity the _____ is the coronal portion of the tooth with the most coronal called pulp horns.

Answer 23

Pulp chamber.

Question 24

In the pulp cavity, the _______ is located in the roots of the tooth.

Answer 24

Pulp canals.

Question 25

What portion of the jaw supports the teeth?

Answer 25

Alveolus process (bone).

Question 26

What is the bony socket in which the tooth sits in?

Answer 26

Alveolar socket.

Question 27

The _______ _____ is the whole crown of the tooth that is covered by enamel, regardless of whether it is erupted.

Answer 27

Anatomical crown.

Question 28

The ______ ______ is the portion of the tooth that is visible in the mouth and may vary because of changes in the position of the gingiva.

Answer 28

Clinical crown.

Question 29

The _____ _____ is the portion of the root that is covered with cementum regardless of eruption.

Answer 29

Anatomical root.

Question 30

The ____ ____ is the unerupted portion of a tooth. It may be the same as the anatomical root or different depending on eruption and gingival recession or overgrowth.

Answer 30

Clinical root.

Question 31

Teeth can have single roots or multiple roots with ________ or _______-roots that are divided into two or three portions respectively.

Answer 31

Bifurcations or trifurcations.

Question 32

Each root has an end which is call the _______.

Answer 32

Apex.

Question 33

At the root tip or apex there is a small opening called a ______.

Answer 33

Foramen.

Question 34

The _____ _____ is dense connective tissue organized into fiber groups that connects the cementum covering the root of the tooth with the aveolar bone of the socket wall.

Answer 34

Periodontal Ligaments.

Question 35

Name all the alveolodental groups fibers?

Answer 35

Apical group, Oblique group, | Horizontal group, Alveolar Crest group, Interradicular group.

Question 36

What fiber group runs from the apex of the tooth to the adjacent alveolar bone?

Answer 36

Apical fiber group.

Question 37

What fiber group resists extraction and forces/occlusal stresses?

Answer 37

Apical fiber group.

Question 38

What fiber group run from coronal cementum to the alveolar bone?

Answer 38

Oblique fiber group.

Question 39

What fiber group resists occlusal stresses?

Answer 39

Oblique fibre group.

Question 40

What fiber group run from cementum to the alveolar crest (horizontally)?

Answer 40

Horizontal fiber group.

Question 41

What fiber group resists horizontal/twisting movement?

Answer 41

Horizontal fiber group.

Question 42

What fibre group run from cementum apical to alveolar crest of bone?

Answer 42

Alveolar crest fiber group.

Question 43

What fiber group resists horizontal movement?

Answer 43

Alveolar crest fiber group.

Question 44

What fiber group only is in only on multi-rooted teeth and run from alveolar crest of bone to adjacent cementum between roots only?

Answer 44

Interradicular fiber group.

Question 45

What fiber group resist extraction forces/occlusal stresses?

Answer 45

Interradicular fiber group.

Question 46

What fibre group run from cementum to the free and attached gingiva and support the gingiva?

Answer 46

Gingiva fiber group.

Question 47

What fiber group has circular (circumferential) gingival fibers run around the free gingiva and hold gingiva to tooth?

Answer 47

Gingiva fiber groups

Question 48

What fiber group run from cementum of interproximal of one tooth to the cementum of interproximal of adjacent tooth (crosses the alveolar crest of bone)?

Answer 48

Transseptal fiber group.

Question 49

What fiber group hold teeth in interproximal contact?

Answer 49

Transseptal fiber group.

Question 50

The gingiva is attached to the tooth through collagen fibers formed by _________.

Answer 50

Fibroblasts.

Question 51

______ ______ are all fibers that are embedded in cementum and pass out the cementum in small bundles.

Answer 51

Sharpeys Fibers.