ID 3 Tooth anatomy and tooth supporting structures Flashcards
What are the 3 main dental tissues
2) What surrounds the roots
1) Enamel, Dentine, Pulp
2) Cementum
What are the functions of the teeth
Mastication
Appearance
Speech
Maintaining vertical position and jaw guidance
Describe the following for Enamel:
1) Colour
2) Mineral Content
3) Hardness
4) Resilience
5) Living or nonliving
1) White
2) 95%
3) Extremely hard
4) Brittle
5) Nonliving
Describe the following for Enamel
6) Formative cell
7) nutritive cell
8) Requirements for nourishment
9) Sensitivity
10) Repair Potential
6) Ameloblast
7) none
8) no
9) no
10) no
state the following for Enamel:
1) Colour
2) Mineral Content
3) Hardness
4) Resilience
5) Living or nonliving
1) White
2) 95%
3) Extremely hard
4) Brittle
5) Nonliving
state the following for Enamel
6) Formative cell
7) nutritive cell
8) Requirements for nourishment
9) Sensitivity
10) Repair Potential
6) Ameloblast
7) none
8) no
9) no
10) no
state the following for Dentine:
1) Colour
2) Mineral Content
3) Hardness
4) Resilience
5) Living or nonliving
1) cream
2) 70%
3) hard
4) very resilient (not brittle)
5) living
state the following for Dentine
6) Formative cell
7) nutritive cell
8) Requirements for nourishment
9) Sensitivity
10) Repair Potential
6) Odontoblast
7) Odontoblast
8) Yes
9) Yes-pain
10) yes
state the following for Cementum:
1) Colour
2) Mineral Content
3) describe Hardness
4) Resilience
5) Living or nonliving
1) cream
2) 61%
3) softer than dentine; harder than bone
4) tough
5) living; may die in maturity
state the following for Dentine
6) Formative cell
7) nutritive cell
8) Requirements for nourishment
9) Sensitivity
10) Repair Potential
6) cementoblast
7) none or cementocytes
8) no
9) no
10) yes
What compound does enamel mainly consist of?
calcium hydroxylapatite
What is the crystalline structural unit of enamel?
How many of these can an ameoblast make?
How are they linked together?
enamel prism
1
Many rods come together with complex interconnecting structures along their length, they form a long curve in vertical plane of sections and undulate up and down in the plane of the section
What are ameloblasts
cells present only during tooth development that deposit tooth enamel, which is the hard outermost layer of the tooth forming the surface of the crown
What is decussation ( when applied to enamel)
The way in which the enamel prisms come together form a long curve in vertical plane of sections and undulate up and down in the plane of the section
What is predentine?
a band of newly formed, unmineralised matrix of dentine at the pulpal border of the dentine
What is _________ dentine?
1) Primmary
2) secondary
3) tertairy
1) formed before completion of root
2) Formed after after root formation
3) Formed due to damdge
what are the 2 types of tertiary dentine, what is the difference between them?
1) 3’ reactionary dentine- formed by original odontoblasts, in reaction to small stimulus/ injury
2) 3’ reparative dentine- formed by newly recruited odontoblasts when repair is required as big injury
What is present in the pulp?
1) Fibrous connective tissues (collagen)
2) Blood vessels and nerves
3) some cells
4) sometimes pulps stones
Where do Blood vessels and nerves enter the tooth?
apical foramen and accessory canals
What cells are present in the pulps?
odontoblasts, fibroblast, undifferentiated cells & defence cells
What are the causes of pulp stones?
- injury
- Age-related, older pulp are less vascular (fewer blood vessels) and get mineralised in the form of pulp stones
Why is fissure sealant applied to molars and premolars?
To fill in occlusal fissures as as frequent site of carries since it cannot be kept clean with toothbrush bristles
What 4 tissues make up the periodontium?
1) Gingiva
2) Periodontal ligament
3) Alveolar bone
4) Cementum
What is the function of the periodontium?
1) attach teeth to jaws
2) Support teeth during chewing- loads create lateral & horizontal movements
