Implants Flashcards
What is the biologic width?
A. 1 mm
B. 2 mm
C. 3 mm
D. 4 mm
B. 2 mm
The biologic width is the distance established by the junctional epithelium and connective tissue attachment to the root surface of a tooth.
Implants should be placed 3-4mm below the free margin of the soft tissue to allow room for the biologic width to be established, for proper emergence of the restoration, and esthetics.
What fibers replace the PDL in implant healing?
A. Hemidesmosomes
B. Circumferential fibers
C. Sharpey Fibers
D. Desmosomes
B. Circumferential fibers
Hemidesmosomes replace the junctional epithelium.
Circumferential fibers replace the PDL.
What bacteria are associated with peri-implantitis?
A. gram positive cocci
B. gram negative cocci
C. gram positive rods
D. gram negative rods
D. gram negative rods
anaerobic, gram-negative rods. Porphyromonas gingivalis, Porphyromonas intermedia, A.a.
For proper esthetic contouring, facial aspect of implant should be how far palatal to facial aspect of restoration?
A. 0.5 mm
B. 1 mm
C. 2 mm
D. 3 mm
C. 2 mm
According to Block, the implant’s labial surface should be placed approximately 2 mm palatal to the labial emergence surface of the planned restoration.
The axis of the implant should be along the axis of the cingulum. This will keep it from being too facial.
What is the most important prognostic indicator for maintaining the papilla after implant placement?
A. Placement of an immediate unloaded provisional
B. Maintenance of 3-5 mm of interproximal crestal bone
C. Delayed implant placement to allow for socket and soft tissue healing
D. Immediate implant placement to capture pre-extraction esthetics
B. Maintenance of 3-5 mm of interproximal crestal bone
When restoring single missing teeth, the interproximal bone between the remaining teeth is a good prognostic indicator of the likelihood of creating and preserving interdental papilla.
4 mm interproximal bone corresponds to 100% chance of creating papilla
5 mm interproximal bone corresponds to 100% chance of creating papilla
6 mm interproximal bone corresponds to 56% chance of creating papilla
7 mm of interproximal bone corresponds to 27% chance of creating papilla
What chemical is used for debridement to remove the biofilm when treating peri implantitis?
A. Normal Saline
B. 3% Hydrogen Peroxide
C. Citric Acid
D. Hypochlorous Acid
C. Citric Acid
Debridement is performed with removal of the granulation tissue and treatment of the implant interface with citric acid to remove the biofilm surrounding the implant. Grafting may then be performed if it is indicated, both osseous and soft tissue. Apically positioned flaps may also be created to remove any pockets. Free gingival or subepithelial connective tissue grafts can be placed to increase the width of keratinized tissue (or allograft)
What is the thickness of the Schneiderian membrane?
A. <0.3 mm
B. <1 mm
C. 1-2 mm
D. 2-3 mm
B. <1 mm
Some sources say the thickness is 0.3-0.8 mm, others say it is 0.13-0.5 mm. Regardless, it is less than 1 mm and not less than 0.3.
What is the required distance that must be maintained between two implants?
A. 2 mm
B. 3 mm
C. 4 mm
D. 5 mm
B. 3 mm
This allows for esthetic rehabilitation to occur. The PDL and bone width adjacent to a tooth is 1.5 mm, so you need to account for both sides of that, so 3 mm is needed between implants to maintain esthetics.
What is the significance of platform switching?
A. Allows for a wider restorative abutment to be placed
B. Requires that the restorative abutment match the size of the implant
C. Decreases the incidence of crestal bone loss
D. Increases the micro gap
C. Decreases the incidence of crestal bone loss
Implant platform switching allows for narrower restorative abutments to be used on wider implants. Previously, abutment sizes matched the size of the implant. Platform switching has been shown to decrease crestal bone resorption by decreasing the horizontal discrepancy between the abutment and implant interfaces. This supposedly makes the micro gap smaller. It prevents the migration of epithelium past the implant-abutment interface, enhancing the connective tissue-osseous attachment in the crestal area.
Take home message: decreases incidence of crestal bone loss.
A microgap usually exists at the implant-abutment interface. There’s a theory that this is a reservoir for bacterial colonization and contributes to crestal bone loss around the implant, but studies quoted in Peterson’s make this seem more hypothetical
How much of an implant should be in direct contact with socket wall during immediate implant placement?
A. 1/4
B. 1/2
C. 2/3
D. 3/4
C. 2/3
If placing an immediate implant, ⅔ of the implant should be in contact with the socket wall and it should be at least 2mm longer than the socket. Any space around the implant that is > 2mm should be grafted
What is the minimum interarch space for a fixed prosthesis using the All-on-4 technique?
A. 1 cm
B. 1.5 cm
C. 2 cm
D. 2.5 cm
B. 1.5 cm
1.5 cm from the soft tissue to the occlusal plane
What is the main advantage of a Z plasty in maxillary frenectomy?
A. It is the easiest form of excision
B. It allows for secondary healing when the frenum base is very wide
C. It leads to less vestibular ablation
D. It prevents vascular compromise
C. It leads to less vestibular ablation
A simple excision is usually adequate for removal of a fibrous maxillary frenum. Advantage of a z-plasty is that it may cause less vestibular ablation. Localized vestibuloplasty with secondary healing is indicated in cases where the frenum base is very wide.
When using the z-plasty technique for a labial frenectomy, the secondary incisions are made at 45 degrees from the vertical limb
Z-plasties can be created at 30, 45, and 60 degree angles to the vertical limb. The more obtuse the angle, the more length you get. a 30 degree angulation gives you 25% length gain in your incision. 45 degree gives you 50% length gain. 60 degree gives you 75% length gain
How often does the lingual nerve lie above the superior border of the alveolus when extracting mandibular third molars?
A. 5%
B. 10%
C. 25%
D. 35%
B. 10%
The lingual nerve, no average, sits 2.28-2.75 mm inferior to the alveolar crest, and 0.58-2.53 mm medial to the alveolar crest (Atlas of OMFS).
10-15% of the time the nerve is superior to the alveolar crest.
25% of the time the nerve abuts the alveolar crest
Which bacteria are most commonly implicated in sinusitis?
Streptococcus pneumoniae
Haemophiles influenza
Moraxella catarrhalis
Which bacteria are most commonly implicated in periodontitis?
Peptostreptococcus, fusobacterium, porphyromonas
Facultative/obligate anaerobes
