Operative Dentistry I: Terminology & Biomechanical
considerations
1. Dentino-enamel junction (DEJ): where enamel meets dentin
2. Cemento-enamel junction (CEJ): where enamel meets cementum
3. Anatomical Crown: part of the tooth covered by enamel or outer covering of
tooth. It is up to cementoenamel junction
4. Clinical crown: visible in oral cavity
5. Hard tissue composition: inorganic: - carbonated-apatite
- hydroxy-apatite
- fluro-apatite
6. Hard tissue composition: organic: lipids, proteins, collagen
7. What is the basic unit of tooth enamel?: enamel rod
- tightly packed, highly organized mass of HYDROXYAPATITE CRYSTALS
- hexagonal in shape and provide rigidity and strengthen enamel
8. Enamel rod: basic unit of tooth enamel
9. Enamel rods have a highly organized mass of?: hydroxyapatite crystals
10.What are incremental growth lines that appear on the surface of tooth enamel
as a series of linear grooves?: Perikymata
11.Perikymata: incremental growth lines that appear on the surface of tooth
enamel as a series of linear grooves
1/
, Operative Dentistry I: Terminology & Biomechanical
considerations
12.Enamel has diffusion channels that allow for or exchange: acid or
ionic
13.Interrod enamel: - located around the rod enamel
- same composition as enamel rod
- different direction
14.Rod sheath: contains proteins, water, lipids
15.What contains protein, water, lipids in the enamel?: Rod sheath
16.Enamel rods/prisms exit to tooth surface: perpendicular
17.What will happen if you leave unsupported enamel in your preparation
margins?: it will chip!
18. consists of microscopic channels, called DENTINAL TUBULES, which radiate
outward through the dentin from the pulp to the exterior cementum or enamel border.:
Dentin
19.Dentin has microscopic channels called: dentinal tubules
- radiate outward through the dentin from the pulp to the exterior cementum
or enamel border
20.What makes dentin softer than enamel?: Dentin has hydroxyapatite crystals 30x
smaller!
- dentin is duller and darker in appearance
2/
considerations
1. Dentino-enamel junction (DEJ): where enamel meets dentin
2. Cemento-enamel junction (CEJ): where enamel meets cementum
3. Anatomical Crown: part of the tooth covered by enamel or outer covering of
tooth. It is up to cementoenamel junction
4. Clinical crown: visible in oral cavity
5. Hard tissue composition: inorganic: - carbonated-apatite
- hydroxy-apatite
- fluro-apatite
6. Hard tissue composition: organic: lipids, proteins, collagen
7. What is the basic unit of tooth enamel?: enamel rod
- tightly packed, highly organized mass of HYDROXYAPATITE CRYSTALS
- hexagonal in shape and provide rigidity and strengthen enamel
8. Enamel rod: basic unit of tooth enamel
9. Enamel rods have a highly organized mass of?: hydroxyapatite crystals
10.What are incremental growth lines that appear on the surface of tooth enamel
as a series of linear grooves?: Perikymata
11.Perikymata: incremental growth lines that appear on the surface of tooth
enamel as a series of linear grooves
1/
, Operative Dentistry I: Terminology & Biomechanical
considerations
12.Enamel has diffusion channels that allow for or exchange: acid or
ionic
13.Interrod enamel: - located around the rod enamel
- same composition as enamel rod
- different direction
14.Rod sheath: contains proteins, water, lipids
15.What contains protein, water, lipids in the enamel?: Rod sheath
16.Enamel rods/prisms exit to tooth surface: perpendicular
17.What will happen if you leave unsupported enamel in your preparation
margins?: it will chip!
18. consists of microscopic channels, called DENTINAL TUBULES, which radiate
outward through the dentin from the pulp to the exterior cementum or enamel border.:
Dentin
19.Dentin has microscopic channels called: dentinal tubules
- radiate outward through the dentin from the pulp to the exterior cementum
or enamel border
20.What makes dentin softer than enamel?: Dentin has hydroxyapatite crystals 30x
smaller!
- dentin is duller and darker in appearance
2/
