Important Info Combined Flashcards
What is the couple agent in composite?
Silane
What do you remove with acid etch?
Smear layer
Etching will…
Increase SA and increase surface energy
Order of composite restoration:
Etch, bond, fill, finish, polish
Purpose of gingival bevel:
Expose ENDS of enamel rods
Definition of smear layer:
Mixture of tooth debris, often contaminated with saliva, blood cells, and bacteria
When to re-etch:
When contaminated or is not frosty white looking
Elastic modulus
Stiffness
low- less stiff for class V
High- more stiff
What matrix do you use for Class III ?
Mylar strip
When more filler is added, the composite is…
harder
Why do you use increments?
Minimize stress
Lower C factor
When are dentin tubules widest?
Near the pulp
Why is bonding to dentin harder?
- Want to be wet, but not over wet
- It is heterogenous
- Want to bind to intertubular dentin, not peritubular
- Interlocking with collagen fibers
What agent lowers the viscosity?
TEGDMA
Best agent to fill abfraction/class V lesion?
Nanofill or microfill
What causes irritated tissue?
Tofflemeier
Forming the hybrid layer consists of?
a. Acid etch
b. Rinsing tooth
c. Adhesive
d. Curing
e. All the above
e. All the above
What does a cure thru matrix do?
a. Achieve best contour
Beveling the gingival floor of a Class II helps with what?
a. good marginal sealing to the gingival floor
b. exposes sides of enamel rods for better bonding
a. good marginal sealing to the gingival floor
What’s the most important reason why you need indetectable margins?
Poor marginal sealing will lead to recurrent decay and staining
How much should you break the facial contact for Class 3?
a. 0.25 mm to fit the matrix and maintain aesthetics?
What type of composites are used at UMKC?
. Nanohybrids
Initiator is _____ for light-cured material
Camphorquinone
You should remove all of the following in a class III preparation, except?
a. Gingival contact
b. Facial contact
c. Incisal contact
d. Lingual contact
Incisal contact (becomes Class 4)
It is okay to leave unsupported enamel in class III prep
True
What do you do before putting on a rubber dam?
Check shade selection