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BP OP
dental CWRU Dr. J BP OP final review
86
Anatomy
Graduate
11/15/2010

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Cards

Term
what class is a prep for pits, fissures, occlusal surfaces, B & L pits
Definition
class I
Term
what class is the prep of posterior proximal surfaces
Definition
class II
Term
what prep is done on the proximal surfaces of the anterior teeth
Definition
class III
Term
what prep is done on the prosimal surfaces of anterior teeth + the incisive edge
Definition
class IV
Term
what prep is done on the gingival third of tooth on B or L surface
Definition
class V
Term
what class prep is done on the cusp tip lesions on the posterior teeth or the occlusal edge only on anterior teeth
Definition
class VI
Term
what are examples of internal walls?
Definition
pulpal and axial walls
Term
what are examples of external walls?
Definition
B L M D G walls
Term
what is retention?
Definition
a way to oppose the forces that would w/draw a restoration
Term
what are methods of gaining retention?
Definition

converging walls

retention grooves

micropores

pins

parallel walls

dovetails

Term
what is resistance?
Definition
shapes made so the restoration resists dislodgement by torque/tipping
Term
what are methods of resistance?
Definition

flat floors

adequate bulk

cavosurface margins are clear (not loaded)

Term
what should the FL width be of a class I?
Definition
1-1.5mm
Term
what should the depth be in a class I prep?
Definition
1.5 mm (.2 into the dentin)
Term
should the marginal ridge diverge or converge and what should the measurement be?
Definition

MR should converge unless they are undermined

molar MR should be 2mm

premolar MR should be 1.6mm

 

Term
what are the measurements of a class II prep?
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

Term
pulpal walls need to ___________and __________
Definition
diverge and be parallel to enamel rods
Term
axial walls should be  _______, _________, & can have ______
Definition
be short of the line angles, need to go .5mm in to dentin, can have .25 mm retention grooves
Term
what are the measurements of an ideal class V?
Definition

height of 2 mm

width short of line angles

.5 mm into dentin w/ .2 retention grooves

Term
is the enamel deeper towards the occlusal or the gingival
Definition
occlusal
Term
T/F: the  contour of a class V and a class II follows the DEJ
Definition
true
Term
what area of a hand instrument do you apply pressure to cut?
Definition
shank
Term
what is the hoe ideal for?
Definition
smooth the floor of a prep
Term
what is the hatchet ideal for?
Definition
contouring box of class II
Term
what is the chisel ideal for?
Definition
smooth floor of a prep
Term
what is the margin trimmer ideal for?
Definition
bevel placement
Term
what instruments are ideal for smoothing the floor of a prep?
Definition
hoe and chisel
Term
when should cross the transverse ridge in an OL prep?
Definition
if the decay crosses more than 50% of the transverse ridge
Term
 which types of clamps  should be put on the tooth first?
Definition
wingless
Term
how do you put winged clamps on with a rubber dam?
Definition
put the wings through the hole and then place both on the tooth
Term
what is the traditional way to place amalgam for a shallow/ideal prep?
Definition
copal varnish + amalgam
Term
what is the CWRU way to place amalgam restoration in a shallow/ideal prep?
Definition

1) amalgam only

2) etch, rinse, scrub 2 coats of adhesive, amalgam

Term
what is the traditional way to place amalgam in a deep prep
Definition
copal varnish+zn phosphate base + amalgam
Term
what is the CWRU method to place amalgam in a deep prep
Definition

same as ideal

1) amalgam only

2) etch + rinse + 2 coats of adhesive scrubbed in+amal

Term
what are the traditional methods of placing an amalgam in a prep that goes close to the pulp?
Definition

1) place calcium hydroxide+ copal varnish+base+amalgam

2) calcium hydroxide+glass ionomer base+varnish+amal

Term
what are the CWRU methods of placing amalgam in a prep close to the pulp
Definition

1) calcium hydroxide+GI base+ copal varnish+amal

2) calcium hydroxide+etch+2 adhesive coats+amalgam

Term
what is copal varnish used for?
Definition
to seal dentinal tubules and protect from the base
Term
what is base used for?
Definition
protects the copal varnish from the metal restoration
Term
what are advantages of zinc phosphate?
Definition

good strength

release fluoride

adheres to the tooth

Term
what are 2 types of bases?
Definition

zn phosphate

glass ionomer

Term
how much calcium hydroxide should you use?
Definition
1 drop
Term
what are the advantages of calcium hydroxide
Definition

stimulates reparative dentin

alkaline

anticariogenic

neutralizes dentin

Term
what are disadvantages of calcium hydroxide?
Definition

bad compressive strength

highly soluble

no inherent adhesive qualities

poor seal

Term
T/F: light curing isn't necessary for the adhesive
Definition
false- light cure after each layer
Term
what is the fxn of the smear layer
Definition
provides some degree of dentinal tubule sealing
Term
what kind of dentin are the dentinal tubules made of and what kind of dentin surrounds the tubules?
Definition
the tubules are peritubular dentin and it is surrounded by intertubular dentin
Term
what are 5 methods to help a complex amalgam restoration
Definition

retention grooves

slots

shelves

amalgapins

pins

Term
what are slots and how deep are they?
Definition
horizontal grooves .5mm deep
Term
what are shelves like?
Definition
shelves are like finish line of a crown
Term
how wide must the shoulder be to place a slot?
Definition
at least 2 mm
Term
what are amalgapins
Definition
holes filled with amalgam
Term
how much clearance do you need for an amalgapin?
Definition
2-3 mm
Term
what are the advantages of a pin?(4)
Definition

conservative of tooth structure

resistance and retention form

time

cost

Term
what are disadvantages of pins?
Definition

microfracture/leakage

technique

perforating

pin spinning loose

fracturing of the drill

misplacement in the pulp or PDL

Term
what are the 3 types of pins
Definition

self threading

cemented

friction locked

Term
where are pins placed?
Definition
in deep dentin
Term
how many pins are usually placed?
Definition
1 for each missing line angle/cusp
Term
what surface should a pin be placed parallel to?
Definition
place parallel to the external surfaces
Term
what is the rule of 2's
Definition

- 2 drill diameters into dentin

-2 mm down into dentin

-2 mm sticking up into amalgam

-2 mm of clearance above pin

Term
where is there more calcified tissue? near the pulp or near the DEJ
Definition

-near the DEJ

-near the pulp you have less calcified tissue and more collagen fibers

Term
what are the layers of the pulp from outside to inside?
Definition

pre-dentin area

odontoblast layer

weil acellular layer

cellular rich zone

 

Term
where do cells come from to produce reparative dentin?
Definition
cellular rich zone
Term
what is remaining dentin thickness?
Definition
RDT is the thickness left from remaining dentin from teh end of the prep
Term
what is the measurement for middle dentin?
Definition
middle dentin has more than .5 mm left
Term
what is the measurement for deep dentin
Definition
less than .5 mm dentin is left
Term
when do you need a pulp liner or base?
Definition

if you have a huge prep with a lot of dentin exposure

if you are in deep dentin w/ microexposure to pulp

Term
what is the fxn of indirect pulp protection?
Definition
regenerative dentin production when caries are left underneath prep
Term
what is new dentin called?
Definition
dentinal "reach"
Term
what happens when there is a mechanical exposure in carious dentin?
Definition
bacterial infection is more likely and the disorganized dentin is less likely to recover
Term
what are disadvantages of glass ionomer base?
Definition
soluble, low ear resistance, water sensitive, very sticky
Term
what are the advantages of glass ionomers?
Definition

-better mechanical properties than calcium hydroxide

-chemical bond w/ dentinal tubules

-true fluoride release

-tooth colored

-increases anticariogenic effects

Term
discuss the summary/overview of pulp capping (4 points):
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

Term
T/F: studies show leaving adjacent caries is just as effective as complete caries removal
Definition
true
Term
what are advantages of cast metal restorations?
Definition

high compressive strength

high tensile strength

good biocompatibility

low wear

better control of contours

Term
what are disadvantages of cast metal restorations
Definition

increased time

provisional needed during tx

cost

technique sensitive

forces

Term
what is the ADA minimum of gold and platinum for metal castings?
Definition
75% gold & pallidum
Term
what are the noble metals?
Definition
palladium, platinum, gold
Term
what are precious metals?
Definition
noble metals (palladium, platinum, gold) + silver
Term
indications for gold castings...
Definition

large restorations

endodontically treated teeth

teeth at risk for fracture

abutments for removal for removal prothesis

Term
contraindications for gold castings...
Definition

increased caries rate

young pts

esthetics

small restorations

Term
what is the divergence of inlays?
Definition
2-5 degrees
Term
what is the occlusal depth of inlays
Definition
1.5 mm
Term
what should the angulation of bevels be in inlays?
Definition
30-40 degrees?
Term
what is the fxn of onlays?
Definition

-protection of weak underlying cuspal structure from fracture

-removal of occlusal margin from heavy stress and wear

Term
what is the reduction of the supporting cusp?
Definition
1.5 mm
Term
what is the reduction of non-supporting cusps?
Definition
.75-1mm
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