Exam (elaborations)
EFDA Quiz, Ch 9,10,11 Questions and Answers 2024
- Course
- Institution
EFDA Quiz, Ch 9,10,11
[Show more]
Content preview
EFDA Quiz, Ch 9,10,11When are composites used? - answer-replace lost tooth structure destroyed by caries
or trauma
-to restore form and function of tooth
-to mask discoloration and mottling
-to reshape teeth (diastema)
Composite bonding of tooth - answer adhesive bonding: strong, durable bond to enamel
and dentin: chemical bond directly to the tooth
composite restorations - answer-Eliminates need for retentive features
-Reduced risk of formation of marginal gaps
-Minimizes penetration of bacteria
-Reduced staining of margins
-replaced silicate cement and acrylic resins; organic matrix of resin containing inorganic
filler particles
-aka resin
-Dr. Bowen 1960
-composed of Bis-GMA and filler (quarts, silica, lithium aluminum silicate, barium
glasses
Nanofil: ground particles from zirconium and zeolite
-Bis-GMA holds filler together
*filler adds strength
porcelain - answer-baked in an oven and cemented into prep: first tooth colored dental
restorative material
-Expensive
-Showed cement line
-Often used for veneers and indirect posterior restorations
Silicate cement - answer-powder liquid
-Released fluoride (silicate aluminum glass)
-Contains phosphoric acid: led to pulpal death
-Relatively opaque, rough, poor resistance to compression
-Soluble causing it to wash out and becomes anesthetic within short time
-On x-rays it looked like a cavity
unfilled acrylic resin - answer"denture-like"
Organic plastic
Powder liquid ratio
MMA and hydroquinone powder (inhibitor) and sulfinic acid (accelerator)
, Easy to place, smooth
Translucent
Resists fracture
Thermal expansion 10xs than the tooth
Increased percolation
Poor abrasion resistance (even from toothbrushing)
Poor color stability
Adverse effects to pulp
creating strong bond - answerfiller coated with epoxy-silane coupling agent
-Increases strength
-reduces solubility
-Reduces water absorption
Advantages of composites - answerResists solubility, dehydration, disintegration,
abrasion
Compressive strength and hardness
Expansion 3x more than tooth
Reduced marginal staining
Reduced percolation
Excellent marginal adaptation (after acid-etch)
Color stability
Disadvantages of composites - answerLarge filler particles not as polishable as unfilled
(matrix wears faster)
Inhibited by ZOE (inhibits setting reaction)
Copal varnish affects bonding process (do not use with composite)
Won't polymerize when exposed to air
Displays as "wet film"
Uses mylar strip to cover
Build up, seal, remove excess with burs
types of composites - answerbased on size and amount and composition of filler
**Strontium and Barium glass fillers make it radio-paque**
Conventional large particle composites - answer75-80% inorganic filler
Rough surface texture
Susceptible to discoloration (extrinsic stain)
micro-filled resins - answer40-60% inorganic filler
Polishable; improves rough surface
Closely resembles tooth structure
0.04 micron size
Less susceptible to stain, recurrent caries, plaque build-up
Susceptible to fractures (do not use in posterior)
Resistance to abrasion
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80796 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now