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EFDA Quiz, Ch 9,10,11 Questions and Answers 2024
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EFDA Quiz, Ch 9,10,11
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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
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