Oral Environment

Question 1

What are preventative materials?

Answer 1

Slow or prevent disease. (Sealants)

Question 2

What are restorative materials?

Answer 2

Repair or replace damaged tooth (composite filling)

Question 3

Direct vs indirect restorative materials

Answer 3

Direct-placed on or in the tooth (cements, fillings)

Indirect- fabricated extraorally and placed in mouth (crowns, veneers)

Question 4

What are auxiliary materials?

Answer 4

Used to fabricate restorations such as stone or dental waxes

Question 5

What are Biomaterials?

Answer 5

Anything interacting with biological system such as injection of cells for tissue regeneration

Question 6

What is the primary building block for the hard oral tissues?

Answer 6

Type 1 collagen matrix reinforced by hydroxyapatite

Question 7

Enamel Composition

Answer 7

By weight: 96% inorganic, 1% organic, 3% water

Question 8

What does the protein coat of individual crystals provide?

Answer 8

Toughness

Question 9

What is etch?

Answer 9

Phosphoric acid that preferentially dissolves enamel crystals

Question 10

Difference between type 1 & 2 etching

Answer 10

1- prism core is preferentially etched

2- prism periphery is etched

Question 11

Composition of Dentin

Answer 11

Volumetrically: 50% carbonate-rich calcium deficient apatite
30% organic material primarily type 1 collagen
20% fluid, mainly plasma

Question 12

Primary, secondary and tertiary dentin

Answer 12

Primary-before tooth erupts
Secondary-after tooth erupts
Tertiary-reparative dentin

Question 13

What are the four classes of dental materials?

Answer 13

Preventative
Restorative
Auxiliary
Biomaterials

Question 14

What is the DEJ?

Answer 14

Fibril reinforced junction between Dentin and enamel