Deck 15: Dental Implants

Question 1

During bone removal for implant placement, the objective is to avoid temperatures in the bone above _____° C.

A) 10
B) 17
C) 27
D) 37
E) 47

Answer 1

37

Question 2

The bone is prepared for an endosseous dental implant with special metallic burs driven at _____ speeds _____ water cooling.

A) high; without
B) slow; without
C) high; with
D) slow; with

Answer 2

slow; with

Question 3

In order for an implant to be successful, how long must osseointegration be maintained?

A) 6 weeks
B) 6 months
C) The first year
D) The first 3 years
E) The lifetime of the implant

Answer 3

The lifetime of the implant

Question 4

Which of the following statements is(are) true of single-stage implant placement?

A) It requires simultaneous hard and soft tissue healing around the implant.
B) Occlusal loading of the implant occurs within days of placement.
C) Peri-implantitis occurs if there is too much initial loading.
D) A, B, and C are true statements.
E) A and C are true statements.

Question 5

An oxygen concentration of _____ wt % is used in grade 1 commercially pure titanium implant alloys.

A) 0.01
B) 0.08
C) 0.18
D) 0.4

Question 6

Burs for preparation of the implant site are composed of which type of special alloy?

A) Nickel
B) Titanium
C) Platinum
D) Stainless steel

Question 7

How is the endosseous implant placed once the implant site is prepared?

A) Pounding it into place with a small hammer
B) Screwing the implant into the site
C) Friction-fitting the implant
D) Both A and B
E) Both B and C

Question 8

An endosseous implant is allowed to heal for at least _______ during the first stage of a two-step placement of an implant.

A) 2 days
B) 2 weeks
C) 6 weeks
D) 6 months
E) 2 years

Question 9

Which factor increases the success rate for implants?

A) The density of bone is increased.
B) Implants are placed with a one-step method.
C) The height of bone around the implant is reduced.
D) Implants are loaded immediately after placement.

Question 10

For most clinical situations, implant success rates are more than ____% as long as the implant osseointegrates initially and the clinical environment is not extreme.

A) 50
B) 75
C) 90
D) 95

Question 11

Which of the following materials promotes osseointegration?

A) Beryllium alloys
B) Dental amalgam
C) Titanium alloys
D) Stainless steel
E) Nickel alloys

Question 12

When the prosthesis is screwed into place, which part of the implant does it thread into?

A) Preparation
B) Healing cap
C) Abutment
D) Bone

Question 13

What occurs during the second stage of a two-stage implant placement where a second surgery is performed to remove the healing caps?

A) Recontour the osseous crest of bone
B) Recontour gingival tissue
C) Place the abutment caps
D) Place the abutments

Question 14

During two-step endosseous implant placement, a ___________ is placed on top of the implant to cover internal threads once the implant is placed into bone.

A) temporary acrylic spacer
B) temporary stayplate
C) space maintainer
D) healing cap

Question 15

Which type of implant-supported prosthesis is most likely to fail?

A) Single crown
B) Mandibular complete denture
C) Maxillary complete denture
D) Multiple tooth endosseous implant not connected to natural teeth
E) Multiple tooth endosseous implant connected to natural teeth

Question 16

Occlusal forces on natural teeth favor bone maintenance. Occlusal loads on dental implants are transmitted to bone mostly by compressive forces and improve osseointegration.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 17

Increasing amounts of oxygen increase the _______ of commercially pure titanium alloys used for endosseous implants.

A) density
B) strength
C) ductility
D) melting range
E) modulus of elasticity

Question 18

A rate of horizontal bone loss greater than _____ mm per year is a sign of a failing implant.

A) 0.01
B) 0.1
C) 0.3
D) 0.5

Question 19

Instrumentation with ___________ is considered to be appropriate for maintaining oral hygiene around dental implants.

A) sonic scalers
B) metal scalers
C) metal curettes
D) plastic scalers
E) ultrasonic scalers

Question 20

What will occur if bone is heated to high temperatures during implant placement?

A) Damage tissue
B) Trigger inflammation
C) Promote rapid healing
D) A and B are correct.
E) A and C are correct.

Question 21

Endosseous implants provide an esthetic substitute for a lost or missing tooth. They are placed to restore lost centric occlusion.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 22

In what way were early implant strategies painful?

A) Had low incidence of postoperative infection
B) Required aggressive techniques
C) Used biocompatible materials
D) Were successful long term

Question 23

Scratches or other disruption of the original manufacturer's oxide layer on the surface of endosseous implants are discouraged. Any contamination of the original surface will increase the risk of failure of the implant to osseointegrate.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 24

Which of the following statements is correct regarding implant success?

A) There is minimal measurable clinical mobility of the implant under occlusal function.
B) Success rates are 75% at 10 years as long as an implant osseointegrates initially.
C) Some ongoing horizontal loss of bone (less than 0.8 mm per year) is common.
D) Success rates decrease if the density or quantity of bone is less.

Question 25

Special instruments are needed to effectively clean titanium dental implants. What are these instruments made of?

A) Ceramic
B) Teflon^®
C) Plastic
D) Only A and C
E) Only B and C

Question 26

Prior to preparing the surgical site, how does the dentist determine where to place the implant?

A) Template
B) Mm ruler
C) Radiograph
D) Custom stent
E) C and D are correct.

Question 27

The thickness of most ceramic coatings on implants ranges from _____ to _____ microns.

A) 2; 5
B) 5; 10
C) 10; 50
D) 50; 100
E) 100; 500

Question 28

Which of the following statements is(are) true about the surface of commercially pure titanium or titanium alloy?

A) Both are covered with a complex mixture of adherent titanium oxides.
B) Oxides rich in oxygen are closer to the surface.
C) Oxides rich in oxygen are closer to the alloy.
D) A and B are true statements.
E) A and C are true statements.

Question 29

How long should an extraction site heal prior to placing an implant?

A) 6 weeks
B) 6 months
C) 8 weeks
D) 8 months

Question 30

Of the following types of implants, which one is seldom used today?

A) Endosseous
B) Transosteal
C) Subperiosteal
D) Both B and C

Question 31

Ceramic coatings improve bone-implant bond strengths. Their long-term stability in service is uncertain.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 32

Which of the following is not a true statement regarding ceramic-coated implants?

A) They are held in place by biointegration.
B) Their longevity has yet to be determined.
C) They are preferred by clinicians over titanium implants.
D) There are occasions when the ceramic coating has debonded.

Question 33

By which method are ceramic implants retained?

A) Ankylosis
B) Biointegration
C) Osseointegration
D) All of the above
E) Only A and C

Question 34

What are the most common ceramic implants made of?

A) Silica
B) Quartz
C) Zirconia
D) Feldspar

Question 35

In osseointegration, a layer of fibrous tissue remains to help cushion the implant. Osseointegration involves ankyloses of the implant.

A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.

Question 36

What could occur if the temperature during the osteotomy exceeds 37° C?

A) Tissue damage
B) Inflammation
C) Post-operative infection
D) All of the above
E) Only A and B are correct.

Question 37

Osseointegration occurs when the bone grows to within _________ of the implant interface.

A) 1 angstrom
B) 10^-10 meters
C) 100 angstroms
D) All of the above
E) Only B and C

Question 38

What causes peri-implantitis?

A) Ineffective plaque removal
B) Poor osseointegration
C) High occlusal forces
D) Horizontal bone loss

Question 39

How does titanium alloy, used for implants, differ from commercially pure titanium?

A) Contains 6 wt % aluminum
B) Contains 4 wt % vanadium
C) Contains 4 wt % aluminum
D) Both A and B
E) Both B and C

Question 40

In general, _______ surfaces and those with ______ surface areas promote the greatest amounts of bone-implant contact during osseointegration of endosseous implants.

A) rougher; greater
B) rougher; smaller
C) smoother; greater
D) smoother; smaller

Question 41

Which of the following is not a trace element found in commercially pure titanium?

A) Iron
B) Carbon
C) Oxygen
D) Hydrogen

Question 42

Compare and contrast biointegration with osseointegration.

Question 43

Identify the major types of implants that are or have been used over the years. Compare and contrast them and discuss why some are rarely used today.