Deck 15: Dental Implants

Question 1

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

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

Answer 1

strength

Question 2

For an implant to be successful,osseointegration must be maintained for:

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

Answer 2

the lifetime of the implant.

Question 3

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

Answer 3

0.5

Question 4

High temperatures in bone during endosseous implant placement will:

A) damage tissue.
B) promote rapid healing.
C) trigger inflammation.
D) do both A and B.
E) do both A and C.

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

The prosthesis is most commonly screwed into place with a small screw that penetrates the top of the crowns and threads into the:

A) abutment.
B) healing cap.
C) implant.
D) bone.

Question 7

Burs for preparation of the implant site are composed of special alloys of:

A) stainless steel.
B) nickel.
C) titanium.
D) platinum.

Question 8

During the second stage of a two-stage implant placement,a second surgery is performed to remove the healing caps and:

A) recontour gingival tissue.
B) recontour the osseous crest of bone.
C) place the abutment caps.
D) place the abutments.

Question 9

Success rates for implants increase if:

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

Question 10

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 11

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) No occlusal loading of the implant occurs for a period of several months.
C) A few clinicians promote the immediate loading of an implant after its placement at an extraction site.
D) A, B, and C are true statements.
E) A and C are true statements.

Question 12

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 13

Occlusal forces on natural teeth favor bone maintenance.However,occlusal loads on dental implants are transmitted to bone mostly by compressive forces that tend to cause resorption of the bone.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 14

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

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

Question 15

Once the implant site is prepared in bone,the endosseous implant is placed by:

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 16

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

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

Question 17

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

Question 18

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

Question 19

Which of the following materials promotes osseointegration?

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

Question 20

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

Question 21

Peri-implantitis is caused by:

A) high occlusal forces.
B) ineffective plaque removal.
C) poor osseointegration.
D) horizontal bone loss.

Question 22

If the temperature during the osteotomy exceeds 37° C,then _____ could occur.

A) tissue damage.
B) protein coagulation.
C) inflammation.
D) all of the above.
E) only B and C.

Question 23

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

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

Question 24

Special instruments are needed to effectively clean titanium dental implants.These instruments are made of:

A) Teflon.
B) ceramic.
C) plastic.
D) all the above.
E) only A and C.

Question 25

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 26

A prosthesis is permanently attached to the implant by:

A) cement.
B) screw.
C) welding.
D) all of the above.
E) only A and B.

Question 27

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

Question 28

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

A) 100 angstrom
B) 1 angstrom
C) 10¯10 meters
D) all of the above
E) only B and C

Question 29

The most common ceramic implants are made of:

A) quartz.
B) zirconia.
C) silica.
D) methyl methacrylate.

Question 30

When preparing the access for an implant,it is imperative that the temperature of the bone not exceed _____°

A) 20
B) 27
C) 30
D) 37

Question 31

Ceramic implants are held in place by:

A) ankylosis.
B) osseointegration.
C) biointegration.
D) all of the above.
E) only A and C.

Question 32

Early implant strategies were painful.They:

A) required aggressive techniques.
B) had low incidence of postoperative infection.
C) were successful long term.
D) used biocompatible materials.

Question 33

Which of the following statements is correct regarding implant success?

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

Question 34

Titanium alloy differs from commercially pure titanium,because titanium alloy also contains:

A) 6 wt % aluminum.
B) 4 wt % vanadium.
C) 4 wt % aluminum.
D) both A and B.
E) both B and C.

Question 35

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 36

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) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 37

Implants are constructed from:

A) stainless steel.
B) gold.
C) titanium.
D) platinum.

Question 38

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.