Lecture #8

Question 1

(Composite Resin) Amelogen Plus:

Answer 1

microhybrid resin composite, non-slump, polish well, radiopaque, 76% filler

Question 2

Composite Resin INDICATED…

Answer 2

for most restorations except large posterior preps

Question 3

Composite Resin SETTING/BONDING MECHANISM

chemical bond to tooth structure

Answer 3

-liquid resin monomer + filler particles
-light-activated polymerization
-phosphoric acid etch = dissolve sm. amt. of tooth structure
*creates micro-irregularities/opens dentinal tubules
for bonding
-hydrophilic primer = flows into soft collagen matrix
* creates hybrid layer
-bonding agent = unfilled resin - creates resin tags on hybrid layer

Question 4

Composite Resin PREPERATION Enamel:

Answer 4

Enamel (only) should be beveled - 0.5mm, 45 degree cavosurface angle

 * increases surface area for bond to enamel (best for composite)
 * exposes enamel rod ends for etching - better strength/marg. seal 
 * eliminate unsupported enamel rods
 * provides esthetic transition from tooth to restoration
 * do NOT beve Class I (thin = may fracture w/ occlusa force)

Question 5

Composite Resin PREPERATION Composite resin bonding

Answer 5

Acid etch,
priming,
bonding agent,
place composite,
finish/polish

Question 6

(Composite Resin) acid etch:

Answer 6

etch whole prep (dentin/enamel/bevels) with phosphoric acid etchant for 15 sec, rinse 15 sec, air dry to remove excess water (do no dessicate)

Question 7

(Composite Resin) priming:

Answer 7

apply primer w/ continuous motion for 30 sec, initial gentle air thin, full air dry (evaporate solvents), light cure 10-20 sec creates hybrid layer

Question 8

(Composite Resin) bonding agent:

Answer 8

coat whole prep, air thin several seconds, light cure 20 sec

Question 9

(Composite Resin) pace composite:

Answer 9

use plastic instrument, try no to incorporate air, light cure increments of <2 mm for 20 sec, define occlusal anatomy

Question 10

(Composite Resin) finish/polish:

Answer 10

remove bulk/air-inhibited layer and add contours w/ finishing burs, then Jiffy polishing kit, or So-Lex disks (low speed)