CON-B Tutorial 5 Flashcards
How would you describe the appearance of this teeth?
-Decidious
-Worn down
-Central incisors : Barrel shaped
-Lateral incisors : Peg shaped
-Missing teeth (Canine + 1st premolar)
What type of restorations are used a lot in dentistry?
Resin-based - either “directly” placed by a clinican or “indirectly” where the restoration is made in the laboratory.
Why is resin used in dentistry?
-Type of synthetic material composed of plastic and glass particles.
-Can be molded and shaped to match the natural shape and colour of teeth.
-Commonly used in restorative/cosmetic dentistry to fill cavities, repair and improve the appearance of teeth.
-Also used to create veeners.
Why can’t composite resin adhere to the tooth structure unless there has been prior preparation?
It is hydrophobic
How can we bond the resin restorative material to the tooth structure?
Either by phosphoric acid etching and/or an adhesive.
Why is dentine difficult to adhere to?
Because it contains fluids.
As its difficult for the substrate to adhere to the dentine, the substrate needs “priming”.
What are the various adhesive systems?
look at word doc.
What adhesive is used at kings?
- Single-step self etching adhesive “scotchbond Universal”
- Selectively enamel etch first.
- Scrub on adhesive all over area to be restored.
3.Then light cure after 30 secs of scurbbing.
What does the process of enamel etching involve?
Discrete etching of the enamel
-In order to provide selective dissolution of prism cores or peripheries
-Into which resin can flow and be polymerized to form a mechanical bond to enamel
why do dentists gove patients fissure sealants?
Adhesion technique for fissure sealant involves acid etching the occlusal fissure with phosphoric acid then placing a small amount of fissure sealant and light-curing.
The aim is to reduce the depth of the deep fissure and make the easier to clean, less plaque retentive and therefore less prone to caries.
Why do fissure sealants not need an adhesive?
-Fissure sealants have very low viscosity
-They can enter etched enamel prismatic spaces
BUT can increase their bonding performance to enamel by adhesive placement after phosphoric acid ethcing
Tooth-preserving and patient level control chart=
Fissure sealant = non-operative
What does etched enamel look like?
Chalky white appearance
