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Implant Dentistry > Restorative Implant Dentistry I > Flashcards

Restorative Implant Dentistry I Flashcards

1
Q

% of 50-59yo in US w single or multiple posterior edentulous spaces bordered by natural teeth:

A

30%

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2
Q

Single tooth replacement in post region, % annual dental care reimbursment:

A

7%

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3
Q

5 options for post single tooth missing:

A

RDP, FDP, Untreated, resin-bonded, implant

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4
Q

TF? 10y survival rate of teeth adjacent to an RPD is lower than that of an RPD or untreated.

A

T FDP: 92%, Untreated: 81%, RDP: 56% 10y survival

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5
Q

15y survival rate for FDP:

A

74%

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6
Q

50% mean life span of FDP:

A

9.6y

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7
Q

10y and 15y survival rates of FDPs:

A

74%, 50%

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8
Q

10y survival of post teeth adjacent to FDP:

A

92%

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9
Q

10y survival of post teeth adjacent to edentulous arae:

A

81%

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10
Q

10y survival of post teeth adjacent to RDP:

A

56%

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11
Q

Most common problem with Resin-bonded posterior single tooth prosthesis:

A

debonding

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12
Q

debonding rate, resin-bonded posterior single tooth prosthesis in 3y:

A

50%

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13
Q

Disadv of resin-bonded posterior single tooth prosthesis:

A

High debond rate, inconvenient (pt and dr), decay on abutment teeth

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14
Q

10y urvival rate of posterior single tooth implant:

A

97-100% (this included maxillary posterior, though, which are far more likely to fail than mandibular, right?)

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15
Q

Disavd to implants:

A

high initial cost, surgical risk

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16
Q

Adv of single tooth implants:

A

No need to splint adjacent teeth, psychological need, no prep of adjacent teeth, hygiene (no floss or pontic), dec cold/ contact sensitivity, esthetics, maintains bone, dec adjacent tooth loss

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17
Q

% dec in bone width 3y after extraction:

A

30%

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18
Q

TF? An implant slows the bone remodelling process.

A

T

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19
Q

Disadv of implant placement:

A

pt compliance, time of tx, consequence of failure, cost, special training/equip

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20
Q

Endossous root form implant complications:

A

surgical, implant loss, bone loss, soft tissue, mech, esthetic/ phonetic, nonoptimal placement

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21
Q

If implant is placed too close to nerve:

A

numbness, damage

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22
Q

If implant hits adjacent tooth:

A

root resorption

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23
Q

If lingual bone is perforated w an implant:

A

may perforate the artery, life threatening

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24
Q

What type of complication is bone loss after implant placement?

A

biological

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25
Q

Contraindication and limitation, post single implants:

A

limited time, inadequate bone/ intra tooth space, mobility of adjacent teeth

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26
Q

Faciopalatal bone volume must be greater than:

A

5mm

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27
Q

MD space needed for an implant greater than 3.5mm diameter:

A

greater than 6.5mm

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28
Q

healthy vertical and lateral movement of posterior teeth:

A

vert: 28um, lateral: 75um

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29
Q

mobility of __+ of adjacent tooth = high risk of implant failure:

A

2+

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30
Q

When can an implant move when it’s not the implant iteslf moving?

A

if bone is moving, if jaw bone is flexible it can move w bone

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31
Q

Which direction of bone volume is more important F-L or MD?

A

FL

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32
Q

If using a 3.5 mm implant, how much F and L space is needed?

A

1.5mm both F and L, then you need 6.5mm

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33
Q

% total chewing efficiency of Mad2M

A

Les than 5%

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34
Q

Problems wi 10% higher bite force for a Man2M:

A

risk of bone loss, porcelain fracture, abutment screw loosening

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35
Q

TF? An extruded Max2M will lead to problems wth occlusion.

A

F

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36
Q

Problem with implant replacement for Man2M:

A

Interference in excursive moves, less predictable, higher location of man canal there, subman fossa depth greater, bone to occ plane angle greater, limited crown ht space for cement retention, limited access for occ screw placement/ correct implant body, crossbite position - implant placed more B than maxillary tooth, hygiene access more difficult, cheek biting, cost

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37
Q

Muscle closest to the 2nd molar:

A

masseter

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38
Q

How to avoid inc risk of bone loss, porcelain fracture, abutment screw loosening, and occlusal interferences during excursions with Man2M implant:

A

metal crown, not ceramic

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39
Q

Why is there inc risk for uncementation for Man2M implant?

A

Lack of crown ht space for cement retention

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40
Q

Are abutments typically shaped to resemble the ideal crown prep for the respective tooth?

A

ask

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41
Q

Which part supports the implant prosthesis?

A

abutment

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42
Q

Abutment classifications:

A

internal/ external, custom/ stock (prefabricated), screw-retained/ frictional lock (cement-retained)

43
Q

What type of abutment is cement-retained?

A

Friction-locked

44
Q

External abutment connection:

A

hexagonal projection, abutment connected through the hexagonal screw in the middle

45
Q

TF? Main source of mechanical retention of the implant is between abutment and screw

A

F. Small s.a. of connection bw the two

46
Q

TF? interface between implant and abutment is weak.

A

T

47
Q

When force is placed on an implant, where is the stress located?

A

interface and screw, screw bends, crown fractures

48
Q

Function of having an abutment that screws into the implant.

A

If all stress is focused on interface (external) the stress is very coronal, compared to internal, the center of rotation is inside, apical, & evenly distributed

49
Q

TF? There is an inc in peak stress w use of an abutment compared to without.

A

F. dec

50
Q

To where is force distributed without an abutment?

A

interface, tension leads to bone resoprtion

51
Q

2 types of implant/ resto interfaces:

A

flushed, platform switching

52
Q

Flushed interface:

A

smooth transition bw the 2

53
Q

Platform switching interface:

A

implant diameter greater than abutment diameter at interface, gap can harbour bacteria (but the benefit is that bone can grow into that space, preserving bone height

54
Q

This is a new concept in implant dentistry for controlling postop crestal bone level:

A

Platform switching

55
Q

How is bone/ abutment interface effected in platform swtiching?

A

abutment is further from implant, If interface is directly adjacent to bone and there is no interface between, this can lead to bone resorption

56
Q

Safety zone that keep bacteria out:

A

platform

57
Q

Disadv of flush design:

A

interface is closer to the bone (check if this is a disadv)

58
Q

Platform switching may preserve:

A

interimplant bone height and soft tissue levels

59
Q

acceptable interface width, non-platform switching

A

1mm

60
Q

Indications for custom abutment:

A

esthetic area, anteriors

61
Q

Cad Cam implant abutment design is based on:

A

gingival tissue contour, company will send custom milled abutment

62
Q

How to compensate if implant is placed suboptimally

A

with the custom abutment B-L gingival tissue lower or higher, etc., especially the esthetic area

63
Q

When to use prefabricate and not cutom made posts?

A

posterior, non-esthetic area

64
Q

Anatomic abutment:

A

abutments w avg gingival ht for a given tooth

65
Q

Adv of custom abutments:

A

gingival tissue ht, inter-arch/ interdental space, implant position/ angulation

66
Q

Materials stock abutments come in:

A

titanium, zirconia, chrome cobalt alloy, gold collar (tzcg)

67
Q

Abutment type that requires preparation:

A

stock abutment

68
Q

Varieties of prefab abutments:

A

narrow, reg, wide, dif gingival/ post heights

69
Q

Why don’t we do cast to gold abutments anymore?

A

we have Cad cam

70
Q

We provide this to lab for custom abutment:

A

diagonal stick cast provisional?(check)

71
Q

Steps for custom abutment fabrication for natural emergence:

A

remove healing abutment, place custom abutment & screw retained temp, remove, take final impression of newly molded gingival tissue

72
Q

What influences gingival color of implant-suupported all ceramic restorations the most?

A

abutment material

73
Q

Delta E:

A

color difference, the lower delta E the better

74
Q

Highest and lowest mean delta E for abutment materials:

A

Titanium: highest, zirconium: lowest

75
Q

What does a delta E of 2 mean?

A

50% of dentists can recognize the difference, so delta E of 8 means that 87.5% could notice the difference?

76
Q

TF? There are sig differences bw the color of peri-implant soft tissue around zirconia abutment and one around gold abutment.

A

F.

77
Q

TF? largest factor influencing peri-mplant soft-tissue color is thickness of the tissue.

A

F. doesn’t appear to be a crucial factor

78
Q

Materials to choose to provide good peri-implant soft tissue color if esthetics are a concern:

A

gold or ceramic (zirconia)

79
Q

Delta E, acceptable and unacceptable range:

A

acceptable: 3-4, unacceptable: 8+

80
Q

% of pts that require additional visits for screw tightening of screw retained implants:

A

10%

81
Q

% of pts that require additional visits for screw tightening of screw retained FDP’s:

A

25%

82
Q

% of peri-implantitis cases w implants:

A

5-10%

83
Q

% of porcelain fracture of implants:

A

16.7%

84
Q

Which is easier to deal with, screw loosened implant or uncementing of implant?

A

loosening, if uncemented, must cut it off

85
Q

% esthetic failure of implants:

A

5-7%

86
Q

Adv of screw retained implants:

A

retrievable, limited inter-arch space, implant bridge, interim abutment, soft tissue magmt

87
Q

Adv of cement retained implants:

A

esthetic, ideal occlusion, easier fabrication, red cost, passive framework, max retention

88
Q

Space req for cement-retained implant:

A

4mm O-G

89
Q

Implant option for limited restorative space due to supereruption:

A

screw- retained or do opposing as well

90
Q

Must have more than __ mm for occlusal clearance for crown material:

A

1mm

91
Q

Need __mm of space for cement retention:

A

5mm

92
Q

_mm bw bone and occlusal table:

A

8mm

93
Q

Implant choice for less than 3mm space:

A

screw-retained

94
Q

Implant choice for 3-4mm space:

A

screw-retained or resin cement

95
Q

Implant choice for more than 4mm space:

A

conventional cement

96
Q

TF? When drilling a larger hole for an implant, increase the size of the drill in a stepwise manner.

A

T

97
Q

This is done in 2 stage implant placement:

A

cover screws w tissue

98
Q

What next after tissue heals over implants:

A

place healing abutments

99
Q

Step after healing abutments:

A

abutment connection or fixture level impression making

100
Q

Step after abutment connection or fixture level impression making:

A

Impression coping, snap on mechanism

101
Q

Step after Impression coping, snap on mechanism:

A

PVS impression (closed tray), impression copings remain in the pvs material

102
Q

What gets inserted into the impression coping?

A

Implant abutment analog

103
Q

After Implant abutment analog is inserted into impression coping:

A

inject soft tissue model around the implant abutment analogs, then die stone material around the pink tissue model, then burn-out wax-up cylinder

104
Q

Alstep after burn-out:

A

wax up, cut-back, metal framework, opaque, porcelain build up, final prosthesis

Implant Dentistry (7 decks)

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