Oral Biology - Intro to Dental Tissues Flashcards
What is meant by the anatomical crown?
The structure of the tooth and its root as it looks without the gums.
Why is the clinical crown always smaller than the anatomical crown?
The clinical crown is what is observed, and the enamel is covered by the gums.
What is the gingivae?
“Gums”
Describe what the cervical margin is.
The boundary where the enamel covers the tooth and the cementum covering the root.
Describe what the term “Gingival Recession” is.
The erosion of the gingivae from the cervical margin, exposing the root of the tooth structure.
Guess the terms
What is the enamel?
The outer protective layer of the crown. It protects the dentine and pulp from damage.
Which substance in your body is stronger than your bones?
The enamel; it is the strongest substance in your body.
What is the amelodentinal junction?
The boundary between the enamel and the underlying dentine.
The healthiest teeth are…
are translucent and slightly yellow, not opaque and bright white.
What is dentine?
Dentine is the main supporting structure of the tooth and is the second hardest tissue in the body after enamel.
Name the ideal properties of Tooth
- Strong
- Hard
- Wear resistant
- Resistant to chemical damage
- Ability to respond to insult/damage
- Ability to repair
- Aesthetic
Which type of bur is required to cut through enamel?
- Diamon
- Tungsten Carbide
*** is the calcified or mineralized tissue layer covering the root of the tooth which sits inside the gum socket.
Cementum
The tooth ** is the innermost layer of your tooth. It contains nerves, blood vessels, specialized cells and connective tissues, which provide nutrients for your tooth.
Pulp
Which part of the crown keeps the tooth alive?
The pulp
Tubular structures are found in…
The dentine. 20% of it is organic, such as collagen fibres.
Prisms structures give the *** its hardness.
Enamel
DIfference between sound and carious dentine?
Sound - healthy
Carious - diseased dentine (soft)
Describe this feature.
Dentinal tubules are the means by which the pulp and mineralised tissues surrounding the dentine (enamel and cementum) communicate.
Name the three pulp functions.
- Dentine formation
- Defence and repair
- Sensory
Guess the features
The lateral canal is…
An accessory (lateral) canal is any branch of the main pulp canal or chamber that communicates with the external surface of the root.
The apical delta
refers to the branching pattern of small accessory canals and minor foramina seen at the tip or apex of some tooth roots.
What feature of the pulp extends into the cusps of the tooth?
The pulp horns
Describe these features
Radiographic Apex: The tip or end of the root as determined radiographically.
Apical Foramen: Opening of the apex.
Which structure becomes increasingly porous as you get closer to its edge?
Dentine
If pulpitis occurs, does the tissue swell?
No, as it is enclosed within a rigid chamber
Describe what is happening here
The anchorage/support of the tooth is reduced progressively. The dentinal tubules become exposed to the exterior surface.
Name the four functions of the enamel?
- Tooth decay (cavities).
- Erosion (wear and tear).
- Infection.
- Teeth sensitivity (to heat, cold and sweets).
