Quiz Flashcards
What is the function of teeth? (4)
Mastication, appearance, support, speech
Which has the highest mineral content?
Enamel
Dentine
Cementum
Enamel
Which is the hardest?
Enamel
Dentine
Cementum
Enamel
Which is the toughest?
Enamel
Dentine
Cementum
Cementum
From what cells does enamel form?
Ameloblasts
From what cells does dentine form?
Odontoblasts
From what cells does cementum form?
Cementoblasts
Is enamel a living tissue?
No
What problems to occlusal fissures pose?
Toothbrush cannot reach the deep fissure so it a prime site for caries
How are occlusal fissure treated?
Applying a fissure sealant
Where does enamel grow from?
The enamel dentine junction from amelobalsts
How is enamel structured?
Crystalline structure
What is pre-dentine?
Newly formed band of dentine found at the plural border, it is unmineralised.
What is primary dentine?
Dentine formed before the completion of the root formation
What is secondary dentine?
Dentine formed after the completion of the root formation
What is tertiary dentine?
Dentine formed in response to an external stimuli
What is reactionary dentine?
Tertiary dentine formed from original odontoblast (weak injury)
What is reparative dentine?
Tertiary dentine formed from new odontoblasts after severe injury
What is pulp made of?
Collagen
What runs through the pulp and where do they enter?
Blood vessels and nerves
Through apical foramen
What cells does the pulp contain?
Mainly fibroblasts, some odontoblasts
What are pulp stones?
Calcified masses that appear in the pulp of damaged or aged teeth
What is the general term for teeth supporting structures?
Periodontium
What are the 4 tooth supporting structures?
Gingiva, cementum, alveolar bone and periodontal ligaments
What are the 2 types of gingiva and where are they found?
Free gingiva - movable - found from the gingival margin to the gingival sulcus
Attached gingiva - attached to the bone
What is the junctional epithelium and why is it leaky?
It attaches the gingiva to the enamel.
It is leaky to allow fluid containing immune cells through
Why is healthy gingiva paler than unhealthy gingiva?
Healthy gingiva contains more keratin to protect it against abrasion during mastication
What is the periodontal ligament made out of?
Collagen fibres
When these are found in the cementum and bone they are known as Sharpay fibres
What is the function of the periodontal ligament?
Resists intrusion of the teeth during mastication
What cells does the periodontal ligament contain and what are their functions?
Osteoblasts form bone
Cementoblasts secrete cementum
Fibroblasts secrete collagen
How is the periodontal ligament adapted for its function?
High cell turnover
Good vascular supply (so it can heal quickly)
Good innervation (so it can respond to pain)
What are the 2 different types fo cementum and where are they found?
Acellular - around the root
Cellular - around the apex
What happens to surrounding alveolar bone if a tooth is removed?
It is resorbed by osteoclasts
What is the Neo-natal line?
A line formed in the tooth at birth to show what dentine was made before and after birth
What is the difference between enamel thickness and EDJ scalloping in primary and permanent mention?
Permanent dentition has a thicker enamel and a more scalloped EDJ
What is the main organic component of dentine?
Collagen
Why are dentine and enamel harder than bone?
Higher mineral content
Is cementum vascular?
Yes
