Reading: Intro to Composites Flashcards
Components of Silicate Cement
Acid-Soluble Glasses
Liquid contains: phosphoric acid, water, and buffering agent
Silicate Cement was recommended for…
1.
2.
- Small restorations in anterior teeth
- high caries activity
Average lifespan of silicate cement
4 yrs
How to tell if silicate cement is failing
- Discoloration
- Loss of contour
- Roughened Glass texture
_______ = rate of dimensional change of a material/unit change in temperature
Linear Coefficient of Thermal Expansion
If the linear coefficient of themal expansion ~~ LCTE of enamel
??? —higher/lower chance for creating voids at the jxn. of the material and tooth structure once temperatures change.
LOWER
TERM – the amount of water that a material absorbs over time per unit of surface area of water.
(H2O/Time)/Volume
Water Sorption
Materials with a higher filler content exhibit ____ water absorption values than materials with lower filler content
LOWER
TERM – refers to a material’s ability to resist surface loss as a result of abrasive contact with opposingtooth structure, restorative material, food boli, and toothbrush bristles.
Wear Resistance
Filler particle _____, ______, & _____ affect the potential wear of composites and other restorative materials
Size
Shape
Content
True or False?
The location of the restoration in the dental arch and occlusal contact relationships affect potential wear of materials
TRUE
The smoothness of the surface of the restorative material is especially needed with restorations near the ______ for good health
Gingiva
What two things of the filler determine the smoothness of the restoration and abiltity to be finished and polished?
- Size
- Composition
What type of composites are BEST for providing surface textures that are polishable, esthetic, and compatible with soft tissues?
- Nanohybrid
- Nanofill
Because of ________ fillers in composite materials, the restorations are radiopaque in radiographs
Barium
When viewing a radiograph–
Caries will be?
Composite will be?
Radiolucent
Radiopaque
Why must composites appear radiopaque-like on a radiograph?
To distinguish between carious lesions which are non-radiopaque!