Dentistry Chapter: Dentine & Dentine Hypersensitivity

Play an AI-generated podcast conversation about this lesson

What is a characteristic of dentine that allows for sensitivity to be experienced?

It is impermeable to the oral environment

It has open tubules that allow for fluid movement (correct)

It has a high osmotic pressure

It has a direct innervation of nerve fibers

What is the mechanism by which odontoblasts act as receptor cells?

They produce a pain sensation through fluid movement

They directly innervate nerve fibers

They are activated by transmembrane receptors

They relay impulses to nerve terminals in the pulp (correct)

What is the most well-evidenced mechanism of dentine hypersensitivity?

Transmembrane receptor mechanism

Odontoblast transducer mechanism

Neural theory

Hydrodynamic theory (correct)

What causes a slow inward movement of fluid in the dentinal tubules?

Hot temperatures Signup and view all the answers

What type of receptor is involved in the transmission of pain stimuli in dentine hypersensitivity?

G-protein-coupled receptors Signup and view all the answers

What is the result of initial compression of fluid in the dentinal tubules?

A 'suction' effect that draws fluid outwards Signup and view all the answers

What is the effect of high osmotic pressure on the dentinal tubules?

It draws water outwards, producing outward movement of fluid Signup and view all the answers

What is the mechanism by which fluid movement triggers a pain stimulus?

Fluid movement across nerves in the subodontoblast plexus Signup and view all the answers

What is the main function of dentine tubules in the tooth structure?

To help make the dentine spongy Signup and view all the answers

What is the primary difference between secondary and tertiary dentine?

Mineral content Signup and view all the answers

What is the range of elastic modulus for primary dentine?

0.1-30 GPa Signup and view all the answers

Which of the following is NOT a characteristic of dentine?

It has a constant mineral content throughout Signup and view all the answers

What is the approximate hardness of dentine in GPa?

0.5-1.0 Signup and view all the answers

What is the relationship between water content, organic content, and mineral content in hard tissues?

Mineral content increases as water content decreases Signup and view all the answers

What is the function of odontoblasts in dentine?

To produce dentine Signup and view all the answers

Which theory explains the mechanism of dentine hypersensitivity?

Hydrodynamic theory Signup and view all the answers

What is the primary effect of high concentrations of potassium outside an excitable cell on action potentials?

It prohibits depolarization Signup and view all the answers

What is the consequence of loss of protection over permeable dentine?

Dentine hypersensitivity results Signup and view all the answers

What is the role of ion channels in the transmission of pain signals in dentine hypersensitivity?

They are heavily involved in the transmission of pain signals from both odontoblasts and neurons Signup and view all the answers

What is the goal of modifying diet and oral hygiene practices and habits in the treatment of dentine hypersensitivity?

To reduce erosion and abrasion Signup and view all the answers

What is the effect of occluding dentinal tubules with various mineral formulations in the treatment of dentine hypersensitivity?

It reduces the sensitivity of dentine Signup and view all the answers

What is the role of reducing excitability of pulp nociceptors in the treatment of dentine hypersensitivity?

It blocks pain signal transmission Signup and view all the answers

What is the primary mechanism by which dentine hypersensitivity is thought to occur?

The hydrodynamic theory is the most widely accepted theory Signup and view all the answers

What is the relation between fluid movement in tubules and pain signals in dentine hypersensitivity?

Fluid movement stimulates responses in odontoblasts and/or neurons Signup and view all the answers

What is the common characteristic of all transmembrane receptors?

Inducing a change inside a cell in response to signals from outside the cell Signup and view all the answers

What is the role of the G-protein in G-protein-coupled receptors?

To deliver messages within the cell Signup and view all the answers

What is the function of enzyme-linked receptors?

To produce enzymatic products Signup and view all the answers

What type of stimuli can ion channels respond to?

Various extracellular stimuli, including voltage, chemicals, and mechanical stimuli Signup and view all the answers

What is the function of ion channels?

To open a permeable channel through which charged ions can flow Signup and view all the answers

What type of cells express signalling proteins that can detect temperature changes or respond to mechanical stimulation?

Both odontoblasts and neurons Signup and view all the answers

What is the analogy used to describe the function of G-proteins?

A courier delivering messages Signup and view all the answers

What is the analogy used to describe the function of enzyme-linked receptors?

A chef producing dishes Signup and view all the answers

What is the recommended approach to prevent further dentine loss?

Avoiding brushing immediately after acid consumption Signup and view all the answers