Ideal Properties of Tooth

Question 1

ideal Properties of Tooth

Answer 1

STRONG
HARD
WEAR RESISTENT
RESISTANT TO CHEMICAL DAMAGE
ABILITY TO RESPOND TO INSULT/DAMAGE
ABIILITY TO REPAIR
AESTHETIC

Question 2

Ideal properties of Enamel

Answer 2

-COVERS ANATOMICAL CROWN
- EPITHELIAL PRODUCT
- 96% INORGANIC - HYDROXYAPATITE
- 2mm THICK (MAX)
- TRANSLUCENT
- NON VITAL
- HARD (KHN 360-390)
- BRITTLE

Question 3

What is the main structual feature of enamal

Answer 3

enamal prisms

Question 4

what is an enamel bur and what does it need to be able to do

Answer 4

high speed air turbine with diamond and tungsten carbide

needs to be able to cut through enamel

Question 5

what happens to unsupported enamel

Answer 5

it is easily fractured with hand instrument

Question 6

what percentage of mineral, matrix and water are the mineralised tissues

Answer 6

mineral matrix water

enamal 96 1-2 2

dentine 70 20 10

cenetum 65 23 12

bone 60 25 15

Question 7

what is dentine and what is its chemical and structural properties

Answer 7

-calcified tissue of the pulp
-vital
- hard strong and resilient specialised connective tissue between the pulp and enamel

• 70% mineral - hydroxyapatite
• 20% organic - collagen
• highly tubular which contain cell processes, nerves and fluid flowing out.
• its tubules are continuous of the pulp
• porous

Question 8

what do you use to drill sound dentine and carious dentine

Answer 8

sound - diamond burs (high speed) OR bladed burs (low/high speed)

carious - soft, cut with a bladed bur or hand excavator

Question 9

how do different fillings stay in

Answer 9

mechanical - undercut

bond to enamel - utilise structural enamel and an acid etch

bond to dentine - acid demineralisation, infiltrate collagen with resin and penitrate tubules with resin

Question 10

what is the dental pulp

Answer 10

specialised connective tissue (essentially a matured dental papilla) effectively enclosed in a rigid chamber

Question 11

what is the functions of the dental pulp

Answer 11

• dentine formation
• defence and repair
• sensory

Question 12

in what ways are dentine and pulp linked

Answer 12

embryologically
physically
functionally

Question 13

what causes inflammation and what is the result of pulp inflammation

Answer 13

due to the dentine being porous, material/procedure may irritate the pulp causing inflamation

no scope for tissue to swell

Question 14

why is dentine considered vital

Answer 14

it can respond to insult to protect the pulp

Question 15

what is cementum

Answer 15

mineralised specialised connective tissue
- covers tooth roots
- tooth support
- resistant to resorption