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OMFS > Implants > Flashcards

Implants Flashcards

1
Q

What metals should be used to clean implant and titanium abutment surfaces?

A

Gold or polyethylene (Teflon) will not scratch titanium implant surfaces

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2
Q

How much bone loss should be expected after the first 12 months?

A

0.2mm/year

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3
Q

What are some complications seen after implant placement?

A

Soft tissue complications
Screw loosening - occlusal overload and later forces
Abutment fracture - cemented restorations
Implant fracture - pure titanium with 3.75mm diameter in a partially dentate patient

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4
Q

Define osseointegration

A

Direct structural and functional connection between living bone and the surface of a load carrying implant

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5
Q

What is the threshold temperature for bone damage?

A

47c for one minute

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6
Q

What is the junctional epithelium of implants mediated by?

A

Pseudo-attachment vía a hemidesmosome complex

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7
Q

In a 9 year old patient with the loss of a permanent maxillary incisor, the most critical factor factor in evaluating the use of an implant?

a. Growth
b. Lack of bone
c. Instability in mixed dentition
d. Inability to perform hygiene

A

A. Growth

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8
Q

A patient has undergone a hemimaxillectomy for SCCC and recieved post-surgical radiation therapy. He has an atrophic edentulous maxilla and a full complement of mandibular teeth. What is the most important factor in implant placement?

a. Location
b. radiation history
c. xerstomia
d. lack of bone for implants

A

A. Location

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9
Q

Autogenous cancellous bone grafts are usually revascularized after

a. 1-2 months
b. 3 months
c. 6 months
d. 12 months

A

A. 1-2 months

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10
Q

The most important biomechanical requirement for a single tooth implant restoration is

a. the abutment be made of alloyed titanium
b. abutment be a two piece design
c. the implant’s coronal surface has an anti-rotation design
d. implant be adequate in size for various tooth sites

A

C. The implants coronal surface have an anti-rotational design

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11
Q

The appropriate torque level for gold palladium abutment screws is

a. 12 n/cm
b. 22 n/cm
c. 32 n/cm
d. 42 n/cm

A

C. 32 n/cm. Optimum torque levels are reached when 75% of the yield strength of the material is developed

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12
Q

Orthodontic therapy for a 9 year old patient who is planned for replacement of congenitally missing lateral incisors with an implant:

a. Guiding the cuspid to its appropriate arch position during eruption
b. Allowing the cuspid to erupt adjacent to the central incisor and then distalizing the canine
c. no orthodontic therapy until all teeth have erupted

A

B. Allow the canine to erupt then distalize it

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13
Q

What is the use of a microporous membrane when placing an immediate implant

a. prevent epithelial downgrowth
b. augment a bony wall and assist in implant stability
c. only use it when primary closure can be obtained over the membrane
d. Only when bone graft material is used around the implant

A

A. the membrane presents epithelial downgrowth into the extraction site

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14
Q

The incidence of dysesthesia following inferior alveolar nerve lateralization in conjunction with implant placement

a. 5 %
b. 15%
c. 25%
d. 50%

A

5%

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15
Q

Which of the following is true of HBO therapy as an adjunctive therapy to implant placement in the irradiated mandible?

a. Benefit increases with the number of dives
b. Hypo vascularity is fully reversed
c. Beneficial effects of HBO decline after the first two years
d. Failure rate of implants is lessened by HBO

A

D

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16
Q

A clinician may prefer a maxillary onlay bone graft with implants as opposed to bone grafts inlaid into the floor of the nose and sinuses in an edentulous patient with a markedly resorbed maxilla, because

a. the onlay graft will provide more lip support
b. There will be less unfavorable leverage on implants
c. a fixed prosthesis is more possible
d. All of the above

A

D. All of the above

17
Q

Maximum tissue coverafe over barrier membranes can be achieved by

a. using the overlapped flap approach
b. placing the vertical incisions away from the lateral borders of the membrane
c. mobilizing the buccal flap to bring it coronally by dissecting the flap superiorly past the vestibular fold
d. All of the above

A

D. All of the above

18
Q

The connective tissue graft can be used to augment defects around implants

a. in a bucco-lingual direction
b. in a bucco-lingual and occluso-gingival direction
c. only at the uncovering stage
d. only at installation stage
e. all of the above
f. A and B

A

A and B

19
Q

Bone regeneration with use of barrier membranes

a. requires complete tissue coverage
b. may be successful in spite of exposure of the membrane
c. requires post-operative monitoring
d. All of the above

A

D. All of the above

20
Q

A 55-year old patient undergoes placement of a maxillary implant with simultaneous bone grafting of the sinus floor through a lateral maxillary wall flap. Which of the following is most important to successful integration of the implant and satisfactory restoration
a. Placement of the incision in the vestibule
b. Thickness of the existing alveolar bone
c. Use of demineralized bone alone
D. Maintenance of mucoperiosteum

A

B. Thickness of the existing alveolar bone

21
Q

A patient is scheduled for insertion of four implants at the maxillary canine and first premolar positions bilaterally for retention of a maxillary overdenture prosthesis. Which prosthesis design is most appropriate?

a. free standing implants with O-ring attachments for implants
b. One bar connecting four implants, with a vertical stress-breaking device on the distal aspect of the bar
c. On bar connecting four implants, with metal clips between anterior implants and no posterior tissue contact

A

b. One bar connecting four implants, with a vertical stress-breaking device on the distal aspect of the bar

22
Q

What is the average maxillary incisor display when the lips are at rest, in men?

a. 0-2mm
b. 4-6mm
c. 2-4mm

A

A. 0-2mm, men show less than women

23
Q

What is the average maxillary incisor display when the lips are at rest, in women?

a. 0-2mm
b. 4-6mm
c. 2-4mm

A

c. 2-4mm, women show more than men

24
Q

A 6.0mm distance from bone to contact area yields what chance of creating papillae?

a. 100%
b. 56%
c. 27%

A

B. 56%

up to 5.0mm - 100%

  1. 0mm - 56%
  2. 0mm - 27%
25
Q

Place the stages of distraction osteogenesis in order

Latency, consolidation, activation

A

Latency period (4-7 days following osteotomy)
Activation (0.5mm to 1mm/day accomplished in segments of 0.25-0.5mm at 2 to 4 times per day)
Consolidation: 3 times the length of the distraction period

OMFS (14 decks)

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