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28 Cards in this Set

  • Front
  • Back
list the seven steps of cavity prep in proper sequence
5.remove caries
6.smooth walls
7.clean surface
importance of outline form
this refers to placement of cavity prep margins in positions they will occupy in the completed cavity prep. ouline form is influenced by:

extent to which enamel is cariously undermined

extent and position of deep non coalesced fissures and pits

location of pulp horns

masticatory facets and wear

strength of restorative material placed


extension for prevention
importance of resistance form
placement and shape of cavity prep walls that best enable the tooth to withstand functional stress on restoration and remaining tooth structure. Resistance form is obtained by:

provision of a seat to withstand stress

placement of walls at rt angels to masticatory forces

adequate tooth reduction to provide for bulk material

removal of all undermined enamel

removal of weak cusps
importance of retention form
refers to design of cavity prep that best permits the restoration to resist displacement through tipping or lifting forces of mastication

ex: dovetails, coverging walls, retentive grooves, and mechanical locks
importance of convenience form
refers to shape of prep to allow observation,acess, and ease of operation while restoring the tooth.

influenced by:

acess to area

extension for prevention

location of caries

amt of tooth seperation

size of instrument used

what is removal of remaining caries influenced by?
extent of caries

state of pulpal health

amt of remaining sound dentin
importance of finishing enamel walls and margins
get best marginal seal between restorative material and tooth and provide max strength of both enamel and restorative material at the margins. this step is accomplished by judicious use of sharp hand instruments and is influenced by:

direction of enamel rods

prescnece of irregular enamel rods

amt of remaining dentin
explain extension for prevention
philosophy that preps should include removal of pits and fissures tht are carious or have deep non colesced fissures
explain why principle of extension for prevention may be modified in regard to non carious pits and fissures of teeth
the non carious deep pits and fissures may be treated more conservatively be sealing them w/resin sealant
list the various elements that may be used to provide retention in cavity preps
buccal and lingual walls converging slightly

explain general considerations of ideal class I cavity prep design as they related to the 7 steps of cavity preparation
make sure to conserve max tooth structure

make prep as thin buccolingually as possible while including all caries but never narrower than smaller condenser

smooth cavosurface margins for cleansability
discuss guidelins for Class I cavity prep on typodont
all major pits and fissures of occlusal surface of typodong are cariously involved and must be included in prep but this may not be case in clinical situation
list and explain criteria that should be met by properly completed calss I occlusal cavity prep
1.classic outline form
2.all cavosurace margins are on smooth surface
3.ideal isthmus width of size of narrowest condenser
4.sloped proximal-occlusal walls
5.margins flow around cusps sharp cavosurface angles cavosurface bevels margins in wear areas
9.pulpal wall perp to Long axis of tooth
10.pulpal wall at depth of 1.5 mm (.5mm into dentin)
11.pulpal wall in dentin
12.buccal/lingual walls converge
13.all internal walls smooth
14.line angles sharp
15. all debris removed
describe variations in class I cavity outlines that might be required man 1 pm
man first pm: the pulpal wall is not perpendicular to long axis of tooth as it is normally, instead the pulpal wall is parallel to plane running from buccal cusp to lingual cusp. this protects prominent buccal pulp horns. Transverse ridge is maintained when possible
what teeth require modification in class I cavity prep?
man 1 pm

max molars
describe variation in Class I cavity outline that may be required for max molars
oblique ridge is maintained whenever possible
purpose of blacks 7steps of cavity prep
represent systematic, scientific procedure for efficiency in cavity prep
what is indication for Class I amalgum restoration?
caraious tooth structue in occlusal fissures detected clinically and w/BWX
What are objectives of Tx for Class I amalgum restoration?
eliminate caries lesions

remove any enamel that has been undermined by caries process

preserve as much tooth structure as possible

create strong restoration that mimics original tooth structure
does presence of deep or stained fissure alone justify placement of restoration?
no. when there is concern that dentin at the base of a deep fissure may become carious the fissure should be sealed w/flowable resin composite
what is difference in groove, fissure, and pit?
groove is linear channel on surface of tooth

fissure is linear cleft. it is result of incomplete fusion of enamel of adjoining dental lobes

a pit is a pinpoint fissure of junction of several fissures
should grooves that have no fissures or caries be routinely incluede in occlusal outline form of class I cavity prep for amalgum?
usually in class I amalgum preparation,occlusal fissures, or at least those in dev grooves has been included in prep even when area of fissure system have not been carious
how does the philosphy of txt toward tx of Class I differ from GV blacks philosophy of extension for prevetion?
author says that carious denin left at base of sealed fissure does not progress, therefore extension for prevention is not justified
are majority of restorations completely protected from leakage begween tooth and restorative material?
most restorations exhibit some leakage at margins although it is minimal.
what is purpose of extablishing smooth curves in cavity outline form?
to facilitate the uncovering of the margins during carving of amalgum. margins should not be jagged bc it is difficult for dr to know whether restoration margin appears to be irrecgular bc of enamel or flash
why is it important to prepare enamel margins at an angle of 90 degrees or more?
to resist fx
what is danger for a cusp that is reduced by more than 1/3 of intercuspal distance during cavity prep?
crack or fx
what should be done if an occlusal carious lesion is so extensive that it encroaches upon the proximal surface or the marginal ridge of the tooth?
if an occlusal caries lesion encroaches on the enamel of the proximal surface so that when the carious dentin is removed, the proximal enamel has no dentinal support, consideration should be to convert the Class I to a Class II prep.