Dentine and Pulp Flashcards
Which substance of the tooth forms the bulk of the tooth?
Dentine
What is dentine harder and softer than?
Harder than bone/cementum
softer than enamel
What has a greater compressive and tensile strength: enamel or dentine?
dentine
What aspect of dentine makes it permeable?
tubules
What is the colour of dentine?
yellow
What is the content of dentine?
HA - 70% weight 50% volume
Water - 10% weight 20% volume
Organic Matrix - 20% weight 30% volume
What does the primary curvature of the dentine look like?
s-shaped
What does the secondary curvature of the dentine look like?
wavy
What are the two properties that distinguish dentine and enamel?
dentine is sensitive. dentine is formed throughout life, increasing in thickness at the expense of the dental pulp.
What happens in dentine due to age?
Due to age, dentine builds up on the inside of the tubules
Does dentine form inwards or outwards?
Forms at ADJ and moves inwards to pulp (our teeth do not get larger as we age)
What is primary dentine?
Formed when tooth begins to form
What is secondary dentine?
Formed once tooth is fully formed
What is tertiary dentine?
Formed after damage has been done to tooth
What cells make dentine?
odontoblasts
What is pre-dentine?
dentine that is not mineralised
How do odontoblasts create tubules?
they shoot arms into the dentine
What are the contents of tubules?
odontoblast process
unmyelinated nerve terminals (sensory)
dendritic cells (immune system)
dentinal fluid
What is the connective tissue ‘core’ of the tooth?
pulp
What are the cells present in the dental pulp?
odontoblasts, fibroblasts, defence cells
What are the ECM components of pulp?
fibres (collagen, oxytalan
matrix (proteoglycans, chondroitin SO4, dermatan SO4)
What nerves are found within the dental pulp?
sensory (autonomic, sympathetic)
What else is contained in the pulp?
blood vessels and lympathics
What happens if the pulp is inflamed?
it can cause damage to the pulp
What are the functions of the pulp?
nutrition, dentine growth, dentine repair, neural (sensory, control of dentinogenesis), defence (immune cells, lymphatics)
What penetrates dentine from the pulp?
axons of neurons
Where are tubules widest?
near the pulp
What is the only sensation emitted from dentine and pulp?
pain
What kind of tissue is pulp?
loose connective tissue
What dentine does the pulp produce when it receives a strong stimuli?
tertiary
Embrologically, what do both dentine and pulp develop from?
dental papilla
