Lecture 16

Question 1

Define Periodontium

Answer 1

The periodontium is the specialized tissues that surround and support the teeth, maintaining them in the maxillary and mandibular bones

Question 2

List the components of Periodotium

Answer 2

• Cementum
• Alveolar bone
• Periodontal ligament
• Gingiva

Question 3

Describe the Cementum

Answer 3

Outer protective layer of the root

Question 4

Describe the Alveolar Bone

Answer 4

Thickened ridge of bone that contains the tooth sockets (dental alveoli) on the jaw bones

Question 5

Describe the Periodontal ligament

Answer 5

Holds the tooth in place

Question 6

Describe the Gingiva

Answer 6

External soft connective tissue, clinically visible, holds tissue against teeth during mastication

Question 7

What is the Gomphosis?

Answer 7

• A joint that binds the teeth to bony teeth sockets in the maxillary bone and mandible.
• Have their origin from ectomesenchyme, i.e., the dental follicle

Question 8

Define Cementum

Answer 8

Thin layer of mineralised tissue covering the external surface of teeth roots

Question 9

What is the foundation for Dentine?

Answer 9

Dentine (Inner surface)

Question 10

Is Cementum Avascular or Vascular?

Answer 10

Avascular and has no innervation

Question 11

Describe the composition of Cementum

Answer 11

• Mineral (hydroxyapatite)
• Protein (collagen)

Question 12

What percentage is the organic components of the Cementum?

Answer 12

90% is Type I Collagen (protein) – like dentine;
other collagens (types III, XII, etc)

Question 13

What are 3 types of cells of Cementum?

Answer 13

1) Cementoblasts
2) Cementocytes
3) Osteoclast/Odontoclast