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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

F) D) and E)
G) A) and D)

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Peri-implantitis is caused by:


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

E) C) and D)
F) A) and B)

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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.

E) B) and D)
F) None of the above

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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.

F) B) and D)
G) B) and E)

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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

E) B) and C)
F) C) and D)

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


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

E) B) and D)
F) A) and D)

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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.

F) A) and B)
G) C) and D)

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E

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

F) C) and D)
G) A) and B)

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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

F) A) and E)
G) B) and D)

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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.

E) B) and D)
F) B) and C)

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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.

F) None of the above
G) A) and E)

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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.

E) All of the above
F) None of the above

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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.

E) All of the above
F) A) and C)

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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.

E) A) and B)
F) B) and C)

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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.

E) A) and B)
F) None of the above

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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

E) C) and D)
F) A) and B)

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D

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.

F) A) and E)
G) A) and C)

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D

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

E) B) and D)
F) A) and B)

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Implants are constructed from:


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

E) All of the above
F) None of the above

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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

E) B) and D)
F) A) and B)

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