Term
| what class is a prep for pits, fissures, occlusal surfaces, B & L pits |
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Definition
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Term
| what class is the prep of posterior proximal surfaces |
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Definition
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Term
| what prep is done on the proximal surfaces of the anterior teeth |
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Definition
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Term
| what prep is done on the prosimal surfaces of anterior teeth + the incisive edge |
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Definition
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Term
| what prep is done on the gingival third of tooth on B or L surface |
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Definition
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Term
| what class prep is done on the cusp tip lesions on the posterior teeth or the occlusal edge only on anterior teeth |
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Definition
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Term
| what are examples of internal walls? |
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Definition
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Term
| what are examples of external walls? |
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Definition
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Term
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Definition
| a way to oppose the forces that would w/draw a restoration |
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Term
| what are methods of gaining retention? |
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Definition
converging walls
retention grooves
micropores
pins
parallel walls
dovetails |
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Term
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Definition
| shapes made so the restoration resists dislodgement by torque/tipping |
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Term
| what are methods of resistance? |
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Definition
flat floors
adequate bulk
cavosurface margins are clear (not loaded) |
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Term
| what should the FL width be of a class I? |
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Definition
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Term
| what should the depth be in a class I prep? |
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Definition
| 1.5 mm (.2 into the dentin) |
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Term
| should the marginal ridge diverge or converge and what should the measurement be? |
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Definition
MR should converge unless they are undermined
molar MR should be 2mm
premolar MR should be 1.6mm
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Term
| what are the measurements of a class II prep? |
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Definition
- cervical floor of box is 1 mm above gingiva
- 1 mm below contact
1-1.5mm below pulpal floor
1.5 mm wide axiopulpally |
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Term
| pulpal walls need to ___________and __________ |
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Definition
| diverge and be parallel to enamel rods |
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Term
| axial walls should be _______, _________, & can have ______ |
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Definition
| be short of the line angles, need to go .5mm in to dentin, can have .25 mm retention grooves |
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Term
| what are the measurements of an ideal class V? |
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Definition
height of 2 mm
width short of line angles
.5 mm into dentin w/ .2 retention grooves |
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Term
| is the enamel deeper towards the occlusal or the gingival |
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Definition
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Term
| T/F: the contour of a class V and a class II follows the DEJ |
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Definition
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Term
| what area of a hand instrument do you apply pressure to cut? |
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Definition
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Term
| what is the hoe ideal for? |
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Definition
| smooth the floor of a prep |
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Term
| what is the hatchet ideal for? |
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Definition
| contouring box of class II |
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Term
| what is the chisel ideal for? |
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Definition
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Term
| what is the margin trimmer ideal for? |
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Definition
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Term
| what instruments are ideal for smoothing the floor of a prep? |
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Definition
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Term
| when should cross the transverse ridge in an OL prep? |
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Definition
| if the decay crosses more than 50% of the transverse ridge |
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Term
| which types of clamps should be put on the tooth first? |
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Definition
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Term
| how do you put winged clamps on with a rubber dam? |
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Definition
| put the wings through the hole and then place both on the tooth |
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Term
| what is the traditional way to place amalgam for a shallow/ideal prep? |
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Definition
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Term
| what is the CWRU way to place amalgam restoration in a shallow/ideal prep? |
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Definition
1) amalgam only
2) etch, rinse, scrub 2 coats of adhesive, amalgam |
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Term
| what is the traditional way to place amalgam in a deep prep |
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Definition
| copal varnish+zn phosphate base + amalgam |
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Term
| what is the CWRU method to place amalgam in a deep prep |
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Definition
same as ideal
1) amalgam only
2) etch + rinse + 2 coats of adhesive scrubbed in+amal |
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Term
| what are the traditional methods of placing an amalgam in a prep that goes close to the pulp? |
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Definition
1) place calcium hydroxide+ copal varnish+base+amalgam
2) calcium hydroxide+glass ionomer base+varnish+amal |
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Term
| what are the CWRU methods of placing amalgam in a prep close to the pulp |
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Definition
1) calcium hydroxide+GI base+ copal varnish+amal
2) calcium hydroxide+etch+2 adhesive coats+amalgam |
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Term
| what is copal varnish used for? |
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Definition
| to seal dentinal tubules and protect from the base |
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Term
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Definition
| protects the copal varnish from the metal restoration |
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Term
| what are advantages of zinc phosphate? |
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Definition
good strength
release fluoride
adheres to the tooth |
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Term
| what are 2 types of bases? |
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Definition
zn phosphate
glass ionomer |
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Term
| how much calcium hydroxide should you use? |
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Definition
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Term
| what are the advantages of calcium hydroxide |
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Definition
stimulates reparative dentin
alkaline
anticariogenic
neutralizes dentin |
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Term
| what are disadvantages of calcium hydroxide? |
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Definition
bad compressive strength
highly soluble
no inherent adhesive qualities
poor seal |
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Term
| T/F: light curing isn't necessary for the adhesive |
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Definition
| false- light cure after each layer |
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Term
| what is the fxn of the smear layer |
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Definition
| provides some degree of dentinal tubule sealing |
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Term
| what kind of dentin are the dentinal tubules made of and what kind of dentin surrounds the tubules? |
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Definition
| the tubules are peritubular dentin and it is surrounded by intertubular dentin |
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Term
| what are 5 methods to help a complex amalgam restoration |
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Definition
retention grooves
slots
shelves
amalgapins
pins |
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Term
| what are slots and how deep are they? |
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Definition
| horizontal grooves .5mm deep |
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Term
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Definition
| shelves are like finish line of a crown |
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Term
| how wide must the shoulder be to place a slot? |
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Definition
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Term
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Definition
| holes filled with amalgam |
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Term
| how much clearance do you need for an amalgapin? |
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Definition
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Term
| what are the advantages of a pin?(4) |
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Definition
conservative of tooth structure
resistance and retention form
time
cost |
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Term
| what are disadvantages of pins? |
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Definition
microfracture/leakage
technique
perforating
pin spinning loose
fracturing of the drill
misplacement in the pulp or PDL |
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Term
| what are the 3 types of pins |
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Definition
self threading
cemented
friction locked |
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Term
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Definition
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Term
| how many pins are usually placed? |
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Definition
| 1 for each missing line angle/cusp |
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Term
| what surface should a pin be placed parallel to? |
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Definition
| place parallel to the external surfaces |
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Term
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Definition
- 2 drill diameters into dentin
-2 mm down into dentin
-2 mm sticking up into amalgam
-2 mm of clearance above pin |
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Term
| where is there more calcified tissue? near the pulp or near the DEJ |
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Definition
-near the DEJ
-near the pulp you have less calcified tissue and more collagen fibers |
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Term
| what are the layers of the pulp from outside to inside? |
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Definition
pre-dentin area
odontoblast layer
weil acellular layer
cellular rich zone
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Term
| where do cells come from to produce reparative dentin? |
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Definition
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Term
| what is remaining dentin thickness? |
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Definition
| RDT is the thickness left from remaining dentin from teh end of the prep |
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Term
| what is the measurement for middle dentin? |
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Definition
| middle dentin has more than .5 mm left |
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Term
| what is the measurement for deep dentin |
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Definition
| less than .5 mm dentin is left |
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Term
| when do you need a pulp liner or base? |
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Definition
if you have a huge prep with a lot of dentin exposure
if you are in deep dentin w/ microexposure to pulp |
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Term
| what is the fxn of indirect pulp protection? |
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Definition
| regenerative dentin production when caries are left underneath prep |
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Term
| what is new dentin called? |
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Definition
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Term
| what happens when there is a mechanical exposure in carious dentin? |
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Definition
| bacterial infection is more likely and the disorganized dentin is less likely to recover |
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Term
| what are disadvantages of glass ionomer base? |
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Definition
| soluble, low ear resistance, water sensitive, very sticky |
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Term
| what are the advantages of glass ionomers? |
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Definition
-better mechanical properties than calcium hydroxide
-chemical bond w/ dentinal tubules
-true fluoride release
-tooth colored
-increases anticariogenic effects |
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Term
| discuss the summary/overview of pulp capping (4 points): |
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Definition
1-if RDT > than .5 mm, no pulp capping is needed
2-RDT > .5 mm w/ caries remaining, use indirect method
3-RDT<.5mm w/o pulp exposure or caries, use direct method
4-RDT<.5mm w/ pulp exposure in carious dentin do endo |
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Term
| T/F: studies show leaving adjacent caries is just as effective as complete caries removal |
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Definition
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Term
| what are advantages of cast metal restorations? |
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Definition
high compressive strength
high tensile strength
good biocompatibility
low wear
better control of contours |
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Term
| what are disadvantages of cast metal restorations |
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Definition
increased time
provisional needed during tx
cost
technique sensitive
forces |
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Term
| what is the ADA minimum of gold and platinum for metal castings? |
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Definition
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Term
| what are the noble metals? |
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Definition
| palladium, platinum, gold |
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Term
| what are precious metals? |
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Definition
| noble metals (palladium, platinum, gold) + silver |
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Term
| indications for gold castings... |
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Definition
large restorations
endodontically treated teeth
teeth at risk for fracture
abutments for removal for removal prothesis |
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Term
| contraindications for gold castings... |
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Definition
increased caries rate
young pts
esthetics
small restorations |
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Term
| what is the divergence of inlays? |
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Definition
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Term
| what is the occlusal depth of inlays |
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Definition
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Term
| what should the angulation of bevels be in inlays? |
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Definition
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Term
| what is the fxn of onlays? |
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Definition
-protection of weak underlying cuspal structure from fracture
-removal of occlusal margin from heavy stress and wear |
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Term
| what is the reduction of the supporting cusp? |
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Definition
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Term
| what is the reduction of non-supporting cusps? |
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Definition
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