principles of cavity preparation? Flashcards

1
Q

who classified cavities and when?

A

greene vardiman black

1896

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2
Q

what is a class one cavity?

A

occlusal surfaces of pre molars and molars

buccal pits of molars

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3
Q

what is a class two cavity?

A

approxial surfaces of molars and pre molars

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4
Q

what is a class 3 cavity?

A

approximal surfaces of incisors and canines

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5
Q

what is a class 4?

A

incisal edges of incisors and canines

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6
Q

what is class 5?

A

cervical margins

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7
Q

what are the disadvantages of blacks classification?

A

pre adhesive materials- retentive cavities needed to be cut
removes more tooth substance than is necessary
does not include root caries and secondary caries

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8
Q

what are the principles of cavity prep?

A
outline form
resistance form
retention form
tx of residual caries
correction of enamel margins
cavity debridement
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9
Q

what is outline form?

A

gaining access to caries

traditionally but cutting through overlying enamel

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10
Q

what is resistance form?

A

to resist occlusal forces
the enable to restoration and remaining tooth structure to withstand masticatory forces
cavity floor at rights angle to occlusal forces
at least 2mm depth

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11
Q

what should be considered re. resistance form for amalgam

A

no unsupported enamel should remain

unsupported enamel will fracture if overloaded

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12
Q

what should be considered re. resistance/retention from for adhesive materials?

A

don’t require retention or resistance form

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13
Q

what is retention form?

A

to allow material to be retained in the cavity

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14
Q

what are forms of retention?

A
grooves in cavity walls
undercut cavity
occlusal keys
bonded amalgams
dentine pins- no longer used
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15
Q

what is meant by treatment of residual caries?

A

caries removed from ADJ first
soft dentine should be removes
stained, but firm dentine can be let
preserve oblique ridge where possible in max molars

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16
Q

how is caries removed?

A

slow rotating bur

finished with hand excavation

17
Q

what is meant by correction of enamel margins?

A

removing unsupported, weak enamel
facilitate placement of matrix
bevel to increase surface area for bonding

18
Q

what is meant by cavity debridement?

A

cavity should be thoroughly washed to remove debris and bacteria

19
Q

what is a line angle?

A

where two lines/surfaces meet

20
Q

what is a cavosurface angle?

A

where cavity wall meets tooth surface (crown)

should be 90-110 degrees

21
Q

what is point angle?

A

where 3 lines/surfaces meet