autumn midterm; class II composite preps and rest

Question 1

what are the brands of interguard, fenderwedge and wedge guard

Answer 1

ultradent, garrison dental and triodent

in order

Question 2

whats different about composite vs amalgam rest prep

Answer 2

no retention grooves needed for composite

Question 3

whats the purpose of a matrix system

Answer 3

• provide proper anatomical contour
• keep restoration from adhering to adjacent tooth
• seal all margins while minimizing flash

Question 4

what is important for anatomical contour of composite prep

Answer 4

• properly positioned contact area
• ideal contact shape in all dimensions
• ideal occlusal and gingival embrasures

Question 5

when are circumferential bands needed vs sectional

Answer 5

sectional; restore proximal surface of a tooth with composite to form appropriate contact- more conservative preps
-circumferential- amalgam restorations, composite buildups or when a sectional matrix wont stay in place bc of dramatic tooth loss

Question 6

what is the pro/con of softwedge by garrison

Answer 6

pro-better anatomical shape

con; water absorbing

Question 7

what are pros/cons of G-wedge by garrison

Answer 7

pro; anatomic form/rigid- if wedge is needed for separation, good length and textured.
cons; more costly

Question 8

what are the pros and cons of wave-wedge by triodent?

Answer 8

pros; truly anatomic form, protects papilla, easy to hold with pin tweezers.
cons; more expensive

if between sizes go larger. THIS IS WHAT WE USE

Question 9

what are the benefits of the ring system

Answer 9

• more predictable contacts
• mimics anatomic size and contour of natural teeth
• gingival seal limited to surface being restored-less tissue trauma.
• minimizes proximal contouring and finishing

Question 10

how does the ring work

Answer 10

buccal/lingual pressure- causes teeth to separate mesially and distally. doesnt depend on wedge for separation!

Question 11

where do you apply selective etch

Answer 11

etch all areas of enamel first

-occlusal cavosurface, gingival box form and exit angles (all enamel spots)- phosphoric acid

Question 12

when do you apply the flowable layer in a composite class II? how much do you use

Answer 12

after the scotch bond/adhesive.

-.25 to .5 mm layer, thin!then light cure for 20 seconds

Question 13

how much should you NOT exceed when adding a layer of composite before light curing

Answer 13

do not exceed 2 mm

Question 14

how do you do the final composite layer on an MO

Answer 14

apply the last incremental filling, PACK not tap. contour and blend– place anatomy and remove flash. open the occlusal embrasure (with an explorer, from the middle to each side) then light cure 20 seconds

–then pull our the ring, then wedge, then CURE proximally , then remove the matrix

Question 15

what can we use for finishing

Answer 15

fine carbide bur, disc, (matrix can be in with the disk?)

Question 16

what are the MO composite steps start to finish/polish

Answer 16

• etch for 15 seconds (enamel)
• scotchbond apply to dentin , blow w air till you see it move, then cure 20 seconds
• apply .25-.5 mm of flowable with explorer. then cure 20 seconds
• apply in 2 mm increments the composite into thebox till you get to the top layer, then occlusal + top of box at the same time. before curing make anatomy, remove flash. open the occlusal embrasure with explorer. then light cure 40 seconds.
• next pul out ring, then wedge then cure proximally. then remove the matrix

next finish: fine carbide or disc
-then check occlusion and flash

then last polish: with a polishing option, checkocclusion and flash again.