L1 - RESTORATIVE DENTAL MATERIALS

Dental restorative materials are used to….

• fill tooth cavities

• cover tooth discolouration

• correct and contour alignment deficiencies

What are direct dental restorative materials?

• materials that can be placed directly into a tooth cavity within one office visit

What are the two direct dental restorative materials?

• composite

• amalgam

What is composite filling made out of?

• mixture of plastic resin and powdered glass filler

What is composite filling used for?

• to repair cracked and decayed teeth

What are the characteristics of bulk-fill composite?

• is flowable and packable

• increment thickness up to 5 mm

• lower polymerization shrinkage

• available as syringe or capsule

What are the characteristics of conventional composite?

• is flowable and packable

• increment thickness 2 mm

• more polymerization shrinkage

• available as syringe or capsule

What are the characteristics of flowable composite?

• thinner consistency “low filler content”

• less stiff

• used in small low stress areas (aka; anterior teeth)

• set using light cu

• recommended to cover with packable composite **

What are the characteristics of packable composite?

• thicker consistency “high filler content”

• more stiff

• used in posterior and anterior teeth

• set using light cure

Steps of filling a cavity:

What is the etching material made out of?

• phosphoric acid (34%-37%)

Etching creates ___________ _________.

Etching creates micro mechanical retention.

• micro locks, better absorb bonding composite.

How do you achieve a bond between the composite and the tooth?

• the tooth MUST be etched and primed. (acts as a glue)

4th generation etch-and-rinse adhesive:

• 3 steps

1. etch

2. prime

3. apply adhesive

5th generation etch-and-rinse adhesive:

• 2 steps

1. etch

2. one bottle (primer + adhesive)

6th generation self-etch adhesive:

• 2 steps

1. self-etch primer

2. adhesive resin

7th generation self-etch adhesive:

• 1 steps

1. single bottle

2. (etch + prime + adhesive)

Which generation is the most popular adhesive and bonding? (MOST used and LATEST system)

• 7th generation

What is a light cure machine?

• blue light machine

• cures composite increments and bonding agent

What is composite curing time?

10-40 secs

What is bonding curing time?

10-20 secs

What is the colour of amalgam and why is it important?

• silver coloured restoration material

• due to it’s color, it’s not aesthetically pleasing, hence its used only in the posterior teeth.

What is amalgam contained in?

• capsules

What is amalgam made out of and how is it prepared?

• mercury :separator: silver alloys (copper, tin, silver)

• mixed using an amalgamator for 6-8 seconds

Amalgam is retained in the cavity by __________ _________.

Amalgam is retained in the cavity by mechanical retention.