Week 5- Class III Prep and Restore Flashcards

1
Q

there are ______ color esthetic zones on a tooth

A

at least 3

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2
Q

when should you choose the shade and why

A

before placing the rubber dam because dehydrating tooth affects shade

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3
Q

how should you choose a shade

A

take shade from portion of shade guide most similar to thickness of restoration

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4
Q

what is the apperance of the shade of the gingival third of the tooth

A

opaque

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5
Q

what is the appearance of the shade of the incisal third of the tooth

A

translucent

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6
Q

what is the appearance of the middle third of the tooth

A

blend of shades of incisal and gingival

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7
Q

avoid margins ending in______

A

occlusal contact areas

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8
Q

when should you mark occlusion

A

prior to applying the dam

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9
Q

in a class III prep where is it acceptable to leave unsupported enamel

A

on the facial wall of the prep
- incisal contact

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10
Q

why is it okay to leave unsupported enamel on the facial wall of the prep

A
  • esthetics improved
  • discoloration and deterioration is less visible
  • color match is easier
  • facial enamel is conserved
  • wedge shaped preparation
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11
Q

where are caries usually present in class III preps

A
  • usually more lingual than facial
  • gingival to contact area
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12
Q

how should the class III prep be prepared

A

perpendicular to long axis

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13
Q

what is the inciso gingival length of class III preps on maxillary lateral

A

1.5mm

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14
Q

what is the inciso gingival length of class III preps on maxillary central

A

2.0mm

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15
Q

what is the mesio distal width of class III preps on maxillary lateral

A

1.0mm

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16
Q

what is the mesio distal width of class III prep on maxillary central

A

1.5mm

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17
Q

what contact is broken in class III and what contact is intact

A

-gingival contact is broken
- incisal contact is intact

18
Q

is retention required in class III prep

A

not always

19
Q

what are the retentive features in class III preps and what bur should you use

A
  • incisal point
  • gingival groove
  • placed with 1/2 or 1/4 round bur
20
Q

where should you place the retentive features in class III preps

A

in dentin

21
Q

when should you avoid placing retention in class III preps

A

deeper than normal prep to avoid pulp exposure

22
Q

where should you place point and groove retention in deep class III prep

A

where they would be in an ideal prep

23
Q

how do you bevel in class III prep

A
  • place 1 mm bevel on lingual and facial
  • 45-60 degrees
  • smooth and even
  • flame shaped diamond bur
24
Q

what would you do differently on a class III with root surface caries

A

same prep but do not bevel in dentin or cementum

25
Q

when would you not bevel and why

A

if there would be heavy centric contact on margin because enamel wears better than composite and enamel is stronger than composite

26
Q

what should you use for added retention in class III when you dont bevel

A

dovetail lock

27
Q

when should you approach a class III prep from the facial

A
  • when lingual access may involve only centric contact of tooth
  • irregular tooth alignment or rotation
  • extensive caries on the facial
  • existing defective restoration on the facial
28
Q

is a liner necessary in class III

A

not really

29
Q

why should you not use eugenol in class III restoration

A

found in IRM
- interferes with polymerization reaction

30
Q

how should a liner be used in a class III if it is necessary

A
  • use CaOH or glass ionomer
  • avoid liner on enamel
  • take care to avoid liner in retention points and grooves
31
Q

when are you more likely to need liner in class III and why

A

in younger patients because larger pulp

32
Q

why should you wedge in class III restoration

A
  • aids in separating the tooth for good contact and control seepage and moisture contamination
  • minimizes finishing time
  • required to prevent gingival overhangs and to stop gingival bleeding or moisture seepage
33
Q

is a class III easier to finish incisally or gingivally

A

incisally

34
Q

how should you use to mylar strip to finish

A
  • tighten mylar strip around restoration and cure
  • results in smooth finish
  • eliminates oxygen interference
  • not necessary to polish this surface if it does not need contouring
35
Q

what are the steps of composite placement in class III

A
  • cover pulpal (axial wall) first get in retentino points and grooves
  • cure
  • second layer
  • cure
  • third layer
  • final cure
36
Q

what burs are preferred when finishing class III lingual surfaces

A

12 bladed finishing burs

37
Q

which is smoother 12 blades or 6 blades

A

12

38
Q

where should the occlusion be

A

on the tooth not the restoration

39
Q

how do you avoid flash on gingival

A

better wedge and clear matrix band placement

40
Q
A