Management Of Dental Caries Flashcards
What is a class IV restoration?
Restoration of the incisal edge
What is a class V restoration?
Restoration at the cervical margin
Why are class V carious lesions more common in the elderly?
Due to gingival recession which exposes the root surface
What fluoride varnish would you use to professionally apply to a patients teeth in the treatment of class V restorations?
Duraphat Varnish
what shape should class V carious lesions be cut?
Kidney shape
What materials could you use to restore a class V cavity?
Glass polyalkenoate or resin composite
What is the recommended restorative material of choice for class v cavities and why?
Glass polyalkenoates, as they release and reuptake fluoride and they are adhesive to tooth substance
Other than poor OH and diet, what other aetiology could cause class V carious lesions?
- Abfraction (crack propagation)
- Over zealous oral hygiene
- Erosion
What class of occlusion is more prone to incisal trauma? And why?
Class II occlusion , as your incisors will be much more prominent
What material is normally used to restore class IV cavities?
Resin composite
In shade matching, what does it mean to take the “hue” of teeth?
Quality that distinguishes one colour from another
In shade matching, what does it mean to take the “value” of teeth?
The dimension that indicates lightness of colour (0-10: 0 being pure black and 10 being pure white)
In shade matching, what does it mean to take the “chroma” of teeth?
Describes colour intensity/saturation of colour
What surface would a class III cavity be on?
On the mesial or distal surface of anterior teeth
Why would we used an approximal strip between teeth when acid etching class III cavities?
To protect the adjacent tooth from etch which may damage and bond it upon light curing.
What is the purpose of a bevel?
Increases surface area for bond
what is a class II cavity?
Mesial and distal cavities in posterior teeth
What should be used to simulate the missing wall of a class II cavity when placing an amalgam restoration?
A matrix band
When using a matrix band, what else could be used to aid the retention and adaptation of the band?
A wooden wedge
Why is a chemically cured resin cement (such as scotchbond-1) used after bonding agent when placing bonded amalgam?
As it will adhere to the bonding agent and will mechanically lock amalgam in place when it sets
What is nano-leakage?
Where dentine is demineralised to a greater depth than bonding resin penetrates
Where on a tooth, is resin composite at most risk of shrinkage and why?
In regions where moisture control is difficult, such as gingival margin.
When placing composite in increments, what type would you use to try and relax stress at cavity margins?
Flowable composite
What is the use of pre-polymerised inserts?
Minimise contraction on curing
how long should you wait between curing cycles?
30 seconds
Why might you use a post cure after finishing a restoration?
This increases surface cross linking and enhances wear resistance
When restoring a class IV cavity, why should the matrix band used while acid etching be removed and replaced before carrying out placement of resin composite?
Because the matrix strip will be wet after acid etching and could impair polymerisation of resin composite
What is the pre operative matrix formed from when using this technique to restore class IV cavity?
Impression silicone putty
Why might you pre-wedge a posterior tooth prior to matrix band placement?
So that the wedge adjusts its position in the periodontal ligament to maximise the chances of establishing a good contact point when matrix band is placed
What instrument might you select to adapt a matrix band?
Burnisher
What shade of composite takes longer to cure? Dark or light?
Dark
Why do darker shades of composite take longer to cure than lighter shades?
Because pigments in the dark shades limit the light transmission and reduce the degree of polymerisation
What is the benefit of using pre-polymerised resin composite inserts in posterior teeth?
Minimises contraction of resin composite and aids contact point establishment
