Midterm questions Flashcards
The most common type of implant used today:
endosteal
Branenark suggested that bone necrosis would occur if the bone was heated to ____ degrees celcius
47
According to the Harvard guidelines of 1986, which of the following is false:
a) there should be no sign of peri-implant infection
b) implants should be immobile
c) implants should be pain free
d) there should be no more than 2mm of bone loss per year
d) there should be no more than 2mm of bone loss per year
The implant systems that we used at UMKC are:
- Straumen
- Nobel care
- Astra tech
Which of the following is NOT a surface modification for implants?
a) acid-etched
b) sodium-phosphate
c) plasma spray
d) sand blasted
b) sodium-phosphate
An individual gets tired walking 1-2 blocks and does light housework, what is their risk of myocardial infarction?
Major
A patient with a BP of 150/90 and uncontrolled diabetes is classified as ASA:
class 3
A patient with uncontrolled angina is classified as ASA:
class 4
Given a case study, what is NOT a reason that an implant should be contraindicated?
age
T/F: A patient with a mitral valve prolapse requires antibiotic prophylaxis
False
Which of the flowing is an effect of detrimental effects of tobacco:
a) tissue hypoxia
b) increase platelet aggregation
c) neutrophil dysfunction
d) decreases fibroblast & collagen
e) all of the above
e) all of the above
Maxillomandibular relationship allows tooth position that has normal articulation with the teeth supported by the residual ridge. Which of the following is the most favorable relationship:
Class 1
For a 4mm implant, what is the minimal distance of the ridge bucco-lingually?
6 mm
T/F: A patient with severe bruxism has the least favorable out come of success
True
The anterior maxilla resorbs slower than the anterior mandible. The maxilla resorbs faster than the mandible.
First- true
Second- false
For implant placement or osteotomy, failure tends to occur at angulation of:
Greater than 25 degrees
Which of the following is NOT true of a CBCT?
a) a CBCT is more grainy than a CT
b) a CBCT has better soft tissue contrast than a CT
c) a CBCT is less expensive
d) a CBCT causes less radiation
b) a CBCT has better soft tissue contrast than a CT
Which of the following can show the buccal-lingual dimensions?
a) intraoral films
b) panoramic films
c) CBCT
d) CT
e) CBCT & CT
e) CBCT & CT
Two types of new bone formation include:
- intramembraneous
- endochondrial
Which of the following forms when woven bone is replaced by lamellar bone?
Osteonal remodeling
Who discovered the theory of osteointegration?
Branemark
Which type of bone is formed around an implant?
contact bone
Which of the following is NOT true regarding contact osteogenesis?
Forms on top of old bone
Biologic width around a tooth?
2 mm (JE + CT)
Connection around an implant:
hemidesmosomes just epithelial
Percentage of implant success in diabetes:
85.5-100%
How many mm of clearance for a screw retained?
4 mm
How many mm of clearance for a cement retained?
7 mm
Direct contact between living bone and implant seen on light microscope:
osseointegration
Distance between implant and tooth:
1.5 mm
Distance between two implants:
3 mm
Minimum biologic width for an implant:
3 mm
Amount of contact between crestal bone and contact:
5 mm
Implant and real tooth, interdental papilla is dependent on:
adjacent tooth
Safety zone of bone:
2 mm
Soft tissue is better viewed on:
Medical CT
Lingual concavity can be viewed on what type of radiograph?
medical CT & CBCT
What is the mineral density scan?
DEXA
Best form of intraoral x-ray:
parallel
Eposteal=
subperiosteal
Transosteal=
transmandibular
Endosteal=
blade & root form
Rough surface of implant allows for:
appositional bone growth
A patient needs an implant on #12 and #13. There is 8 mm buccal-lingually and 13.5 mm medially-distally. What is the maximum diameter of implants that can be used:
4.3 mm diameter and 3 mm diameter
A UCLA implant can be used with:
- screw retained crown
- custom abutment
What is advantageous about a screw retained crown?
Can be used with a decreased vertical space
A disadvantage of a cemented crown is:
can’t be easily removed
The open tray technique is a _____ impression technique used for ____ implants
direct; divergent
with splinting during multiple impression copings, which of the following is true:
Rigid splitting is preferred
The closed technique is:
most similar to a fixed prosthetic impression
The maximum torque on an abutment should be:
35 Ncm
Regarding cementation, which of the following is true?
Blockout material is placed over the screw head
Which of the following has the most variable magnification?
panoramic
Which of the following has the highest level of radiation?
Medical CT
An implant has a higher occlusal awareness than a natural tooth. An implant has a functional bite force 4x that of a natural tooth:
First- false
Second- true
A tooth exhibits more vertical movement than an implant resulting in lower occlusal loads on the implant. The implant tooth will not move under any functional load.
Both false
The primary occlusal contact should be placed:
directly over the implant
the maxilla undergoes ____ resorption and can cause a ____ with the posterior dentition
centripetal; cross-bite
D4 bone is described as all the following except:
found in the anterior mandible
splinting adjacent implant crowns is indicated in which of the following:
- questionable bone
- parafunctional habits
- implant surgical depends on the adjacent implants
(all of the above)
Splinting of an implant crown can cause which potential implants:
- if one crown is replaced all crowns will usually have to be replaced
- hygiene is difficult
- fit in a passive occlusion is difficult
(all of the above)
Implant retained dentures is contraindicated with:
- poor quality of bone
- poor oral hygeine
- poor tissue tolerance
- patients who receive > 12000 rads od radiation
(all of the above)
An implant retained denture is an examine of:
overdenture
How many mm of space must be present between the bone and opposing occlusion in a single implant crown?
6 mm
What is shown in the following image?
driver
What is shown in the following image?
impression coping
What is shown in the following image?
implant replica
according to recent studies what is the average success rate for dental implants:
98%
What is shown in the following image?
prosthetic abutment
Which type of implant is restricted to ONLY the anterior mandible:
transosteal
Which type of implant is included by “in the bone”?
Endosteal
What type of implant is a subperiosteal?
eposteal
What is the average amount of bone loss after the 1st year of implant placement?
0.1 mm
Which of the following is NOT a characteristic of titanium of titanium alloy used for dental implants?
high modulous of elasticity
Which surface texture is the most ideal for dental implants?
moderately rough
What is NOT a method of surface modification?
Cobalt-chromium coating
Which bone cell type deposits osteoid matrix:
osteoblasts
What is the ideal torque for immediate loading?
greater than 35 Ncm
What is FALSE regarding dental implants?
a) supracrestal tissue is lost
b) ankylosis
c) direct bone-to-implant contact
d) peri-implant are oriented perpendicular to the implant
d- because the fibers are parallel not perpendicular
What is FALSE regarding dental implants?
a) blood supply is by terminal branch of large blood vessels
b) more ininflammatory response than gingival fibers
c) fewer capillaries
d) blood supply is from the endosteum
d- because blood supply is from the periosteum
How much space should be between implant and tooth?
1.5 mm
How much space should be between implants?
3 mm
Which is false regarding the benefits of platform switching?
a) shifts the inflammatory cell infiltrate inward and away from the adjacent crestal bone
b) maintains the supracrestal attachment
c) decreases the distance of implant-abutment junction from the crestal bone
d) limits possible interface of bone with micro-movements
C- decreases the distance of implant-abutment junction from the crestal bone
