Caries Flashcards
What is the critical pH of enamel and what occurs below this?
pH 5.5
Below this demineralisation is favoured
What is caries risk?
The probability that a person will develop various lesions, reaching a given stage of the disease in progression during a specific period of time.
What is the max score of a DMFS?
128
What is the relationship between caries and light compared to enamel and dentine?
Caries scatters more light than enamel and dentine
When can you use a sharp probe for enamel caries?
For dentine caries where you have to and for residual caries to aid cavity preparation
What is a blunt probe used for during primary caries detection?
Cavitation
Surface roughness
For what do you use temporary elective tooth separation?
Interproximal caries
What is diagnodent?
Measures bacterial porphyrins as they fluoresce and it then detects the amount of fluorescence associated with the carious lesion.
What is ICDAS?
International caries detection and assessment system
For what type of caries is ICDAS used?
Coronal and root surfaces as well as caries adjacent to restorations and sealants.
What would be described as an ICDAS code 5?
Distinct cavity
What is an ICDAS code 4?
Dentine shadow
Where would you find caries if it was classed as a class II?
Approximal surfaces of molars and premolars
Where would you expect caries to be found in a class III lesion?
Approximal surfaces of incisors and canines.
How can you increase the surface area for bonding?
Create a bevel.
Give an example of a chemomechanical method which allows carious dentine and sound dentine to be separated?
Carisolv
Describe the process of stepwise excavation.
- clear the amelodentinal junction of all caries
- free the cavity floor of superficial necrotic and demineralised dentine avoiding areas close to the pulp
- line with dycal and GIC resin
- reopen in 6-8 weeks and excavate to yellowish/greyish dentine
- line dycal, vitrebond and fill
What is the main advantage using acid etch and dentine bonding agent?
These reduce the need for the mechanical creation off undercuts so conserves tooth substance.
Why are dentine pins rarely used these days?
They risk pulpal exposure and PDL damage
When using what type of material can you leave unsupported enamel?
When using adhesive materials as they can act as a splint.
Which restoration material is adhesive?
Glass polyalkenoate
What anatomical structure of the maxillary molars should you try to preserve?
The oblique ridge
By performing a restoration on a tooth which growth factor is released causing pulpal inflammation?
TGFbeta
What are the 4 main functions of the pulp?
- formative (produces dentine)
- nutritive (nourishes avascular dentine)
- protective (carries nerves that make dentine sensitive)
- reparative (produces new dentine)
