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25 terms

Composites and Esthetics

improve the appearance of the teeth
STUDY
PLAY
veneers
-thin layers of tooth-colored material that cover much of the facial surface
-Conservative approach for restoration of the labial or incisal surfaces of an anterior tooth. Acid etching is used for mechanical retention.
Direct Bonding
A composite material covering the entire surface of a tooth (labial)
Indirect bonding
A veneer is fabricated in a lab from an impression taken by the dentist
Bonded Porcelain Veneers
Preformed porcelain veneer that is bonded with composite over an acid etched prepared surface.
Restorations
used in all cavity classifications and inlays
Cosmetics
used to close a diastemas, restores fractures teeth, and stained or defective enamel.
composites
classified according to size or filler material, which determines the strenght and wear resistance characteristics of the material
Macrofilled Composites
Largest filler particles have the best strength but are hard to polish. Used in class IV restorations because they are strong enought to resist fracture and are esthetically pleasing.
Microfilled Composites
(a) Inorganic fillers in microfilled composite produce a high polish
(b) Used mostly on anteriors
They are used as a cosmetic filling material for class III and V restorations
Hybrid Composites
(inlays)
(a) contain both Macro and Microfilled particles
(b) Have more strenght, wear resistance and easier to polish
Unfilled Acrylic resins
used in temporary crowns and bridges.
(a) uses chemicals for polymerization and consists of a powder and liquid.
Self-cured
1. Base and catalyst
2. Mixing Pad
3. Plastic spatula
4. Mechanical Retention
5. Mix equal amounts for 30 seconds. Sets in 3 minutes
Components of Light-cured
1. set by curing light.
2. Acid Etch
3. Bonding Agent
4. Composite: applied directly to tooth. Applied in increments.
5.Used for mechanical retention
Acid etching
(phosphoric acid) Is used for mechanical retention.
For bonding a tooth
must be prepared by removing calculus, and coronal polished with pumice that contains no flouride.
Enamel Bonding
Etch with 35%-50% phosphoric acid solution is applied directly to the enamel surface on the undercuts. Allow etch to sit 30-60 seconds before rinsing for 1 minute. the tooth should have a frosty look to it. Glass Ionomer liner is used takes 10-15 seconds to set.
Dentin Bonding
Relies on chemical retention. Both dentin and enamel bonding should be from the same manufacturer.
Primer
Is brushed on the dentin surface 30-60 seconds. This removes the smear layer form the prep. Do not rinse. Dry with air for 15 seconds or till dentin appears dull and dry.
Bonding Agent
is applied to dentin and enamel surface. Thin the agent with a stream of air, then light cure. Universal bond for dentin and enamel is used.
Composition of light cured
organic polymeric matrix reinforced with inorganic filler such as quartz, glass lithium aluminum silicate.
Precautions of light cured
(a) do not use eugenol under composites. It retards the setting time.
(b) Place dark colored containers away from the heat or direct light of any kind
(c) Monomer should be used in open area or vented space due to odor
(d) Place composite material in refrigerator to extend shelf life.
Acrylic Resin
used to make temporary crowns and bridges
can repair or extend restoration without replacing
Factors which control setting time
Humidity. Method of application. Old material. Mixing time
5 to 10 minutes
setting time of acrylic resin
30 seconds
Mixing time of acrylic resin