Week 11 PP Flashcards
What is a direct restorative material?
Applied to a tooth or teeth while the material is pliable and can still be adapted, carved, and finished.
Materials used in direct restorative/esthetic procedures:
-Amalgam
-Composite resins
-Glass Ionomers
-Temporary restorative materials
-Tooth-whitening products
Indications for Using Composite Resin
-Class I, II, II, IV & V restorations (ALL!!)
-restoration of surface defects:
*hypocalcifications
*attrition
*abrasion
*congenital abnormalities
- Diastema closures & re-contouring of peg laterals
Composite Resin Contraindications
-Patients who have high caries incidence
-With patients who do not have daily proper oral hygiene habits, especially in the posterior area
-When the teeth affected have abnormal or heavy occlusal forces
-When the cost of restorative materials is a significant factor in the treatment decision
The composition of composite resins is a chemical mix, which includes:
- An organic resin matrix (BIS-GMA)
- inorganic fillers
- A coupling agent
- Pigments
What is the Organic Resin Matrix?
A fluid like material called dimethacrylate, also referred to as BIS-GMA.
- the fluid, a monomer used to make synthetic resins
-by itself, it is not strong enough to be used as a restorative material
What is the Filler in Composite?
Inorganic fillers include quartz, glass, silica particles, and colorants
What do fillers add to composites?
These fillers add the strength and characteristics that are needed in a restorative material
2 Types of Composites?
Macrofilled composites
Microfilled composites
What are Macrofilled composites?
Contain the largest of filler particles, providing the greatest strength, but a duller rougher surface
-Self cured, used in areas where great strength is required
What are Microfilled composites?
-Contain inorganic fillers much smaller than those in macrofilled composites
-Capable of producing a highly polished finished restoration, used primarily in anterior restoration
What are Hybrid Composites?
“Midfill”
- most often used today, they contain a mixed range of particle sizes. They have high wear resistance and excellent shading characteristics
What are flowable composites?
-can be used to fill in small holes, gaps
-designed to flow more easily into the preparation
What are Sealant Composites?
Resemble flowable composites but have the viscosity to allow the material to flow into the pits and fissures of the tooth surface
What is the purpose of the coupling agent?
Strengthens the resin by chemically bonding the filler to the resin matrix
like the “eggs” in cake batter - holds everything together
What is the purpose of Pigments in Composite?
For a composite material to match a tooth colour, colouring must be added
- most often, the colour comes from an inorganic substance
Composites VS Amalgam - Application
-Bonding system rather than by retention added into the preparation
-specific dental materials cannot be used with composite resins
-the matrix system will vary with composite resins
-placemet of composite resins is accomplished by increments; light curing is perforemd before additional increments are added
Can you use IRM with composite?
NO! ABSOLUTELY NOT
What type of matrix is used for composite?
SECTIONALS ONLY
What is one of the most critical aspects when working with composite resins?
One of hte most critical aspects when working with composite resins is the SHADE SELECTION
- a shade guide is always used when determining the correct shade for application
- use natural light, teeth must be hydrated (not dry), no isolation to be used
Tips for Choosing a Shade
-use Daylight
-The entire surrounding should be kept free from bright colours
-Make the choice quickly; always accept the first decision since the eyes begin to tire after approxiately 5 to 7 seconds
