Dental Tissues Flashcards
What sit he clinical crown
When the tooth in situ and has gingivae covering part of anatomical crown
What are the basics of the tooth anatomy
Form exterior to interior
Enamel Amelodentinal junction Dentine Cementum Pulp
What are the ideal properties for a tooth
String Resistant to wear or chem damage Hard Respond to damage and repair Aesthetic
What are the mineralised tissues associated with the tooth
Enamel
Dentine
Cementum
Bone
What is enamel
Covers anatomical crown Epithelial product Hydroxyapatite 2mm thick Translucent Non vital Hard Brittle
How is enamel arranged
In prisms
What is needed to cut enamel
Enamel bur which is a high speed sir turbine made with diamond and tungsten carbide
Unsupported enamel is
Easily fractured with a hand instrument such as a chisel
What si dentine
Specialised connective tissue Hard Strong and resilient 70% mineral and rest collagen Has pre dentine - non mineralised beside the pulp
What are the directions of the collagen fibres in the dentine
Follow the outline of the enamel
What is Carious dentine like
Soft
Cut with bladed bur or hand excavator
How is dentin tubular
And has tubules continuos with pulp
Tubules may contain cell processes, nerves, fluid
Vital more tubules in pre dentine than amelodentinal junction
What are some ways to ensure a filling stays in place
Mechanical undercut
Bond to enamel using acid etch
Bond to dentine using acid demineralisation, infiltrate with collagen with resin, penetrate tubules with resin
What si the dental pulp
Specialised connective tissue
Essentially matured dental papillae
Dentine is calcified tissue of the pulp
What are the functions of the pulp
Dentine formation
Defence and repair
Sensory
What si the gross anatomy of the tooth
Pulp horns
Coronal pulp chambers
Radicular pulp
Apical formen
What are the pulp variations
Apical formen
Lateral canals
What si the dentine-pulp complex
Dentine and pulp are linked
- embryo logically
- physically
- functionally
As dentine is porous what can this mean
Any material may irritate pulp can cause inflammation
What si the cementum
Mineralised tissue Mineralised connective tissue Covers tooth roots Tooth support Resistant to resorption
What is the cementum to enamel relationship
Usually overlap onto enable but if there is a gap this can cause sensitivity of teeth as contact dentine
What is the
- apex
- cervical margin
- root
- anatomical crown
- Invisalign edge
Apex very tio of root
Root inside alveolus
Cervical margin is where root becomes crown and has enamel
Anatomical crown when tooth not in situ
