Deck 3: Fundamental and Preventive Curvatures

Question 1

Each of the following can be damaged by an overhanging restoration EXCEPT one.Which one is the EXCEPTION?

A) Contact point
B) Marginal gingiva
C) Plaque retention
D) Alveolar bone
E) Contact area

Answer 1

A
A contact point is where the occlusal cusp of one tooth touches the occlusal portion of the opposing arch.Although an overhanging restoration would not affect the contact point,the health and position of the marginal gingiva;plaque retention and accumulation;integrity of the alveolar bone;and the contact AREA would all be affected.Note that the contact point and the contact area differ significantly.Also note that with time and progressive periodontal damage,teeth may drift and ultimately may also affect the contact point!

Question 2

Posterior teeth have contact areas slightly buccal to the center of teeth.Lingual embrasures of posterior teeth are wider than buccal embrasures.

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

Answer 2

A
Posterior teeth have contact areas slightly buccal to the center of teeth.Consequently,buccolingually the lingual embrasures are wider than the facial embrasures.The reason is that from their contact point outward,teeth are narrower on the lingual side than on the facial side.These relationships are apparent when viewed occlusally.

Question 3

MATCHING
Characteristics of tooth shape and alignment protect the periodontium,preserve the dentition,and enhance self-cleaning mechanisms.Match each anatomic feature with its most closely related corresponding term.
a.Interdental space
b.Crest of curvature
c.Cervical line
d.Embrasure
e.Occlusal contact
CEJ

Answer 3

C

Question 4

Which illustration depicts an overcontoured restoration?

A)
B)
C)

Question 5

Height of contour is the same as

A) embrasure
B) crest of curvature
C) alignment
D) proximal contact
E) width of tooth

Question 6

Embrasures are spillways between teeth that allow food to be shunted away from contact areas.While effective embrasures are self-cleaning,poorly contoured embrasures lead to gingival irritation and breakdown.

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

Question 7

Contact point and contact area are synonymous terms;that is,they mean the same thing.

Question 8

Deep pits and fissures on the occlusal surface make cleaning the tooth difficult.

Question 9

MATCHING
Characteristics of tooth shape and alignment protect the periodontium,preserve the dentition,and enhance self-cleaning mechanisms.Match each anatomic feature with its most closely related corresponding term.
a.Interdental space
b.Crest of curvature
c.Cervical line
d.Embrasure
e.Occlusal contact
Spillway

Question 10

Interproximal spaces lie between teeth and bone on one side and the proximal surfaces and their contact area on the other side.Interproximal spaces are U-shaped in posterior regions and more rounded in anterior regions.

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

Question 11

The facial crest of curvature for all teeth is located at the cervical third.

Question 12

Each of the following is part of the periodontium EXCEPT one.Which one is the EXCEPTION?

A) Enamel
B) Cementum
C) Free gingiva
D) Alveolar mucosa
E) Alveolar bone

Question 13

A molar with little or no curvature on the buccal surface would result in

A) open contact area
B) overstimulation of gingiva
C) inadequate stimulation of gingiva
D) difficult oral hygiene access

Question 14

Each of the following is a characteristic of contact areas EXCEPT one.Which one is the EXCEPTION?

A) Stabilize teeth
B) Discourage food impaction
C) Are located in middle third of tooth
D) Protect interdental papilla
E) All are true.

Question 15

An overhanging restoration extends above the occlusal surface and prevents normal occlusal contact between the arches.

Question 16

The curvature of the CEJ is generally greater on the mesial surfaces.

Question 17

Each of the following statements is true of the curvature of the CEJ EXCEPT one.Which one is the EXCEPTION?

A) The curvature of the cervical line,or CEJ,depends on the height of the contact area.
B) The curvature of the cervical line,or CEJ,depends on the diameter of the crown.
C) The mandibular anterior teeth show the greatest amount of curvature of the cervical line.
D) The more anterior the tooth,the greater is the curvature of the cervical line.

Question 18

What are the arrows pointing to in the illustration below?

A) Contact areas
B) Height of curvature
C) Buccal contour
D) Excess curvature
E) None of the above

Question 19

Each of the following is a function of embrasures EXCEPT one.Which one is the EXCEPTION?

A) Provide self-cleansing from the contact area
B) Reduce occlusal trauma
C) Discourage food impaction
D) Prevent gingival stimulation

Question 20

Alignment refers to the height or level of alveolar bone between teeth.

Question 21

MATCHING
Characteristics of tooth shape and alignment protect the periodontium,preserve the dentition,and enhance self-cleaning mechanisms.Match each anatomic feature with its most closely related corresponding term.
a.Interdental space
b.Crest of curvature
c.Cervical line
d.Embrasure
e.Occlusal contact
Interproximal space

Question 22

MATCHING
Characteristics of tooth shape and alignment protect the periodontium,preserve the dentition,and enhance self-cleaning mechanisms.Match each anatomic feature with its most closely related corresponding term.
a.Interdental space
b.Crest of curvature
c.Cervical line
d.Embrasure
e.Occlusal contact
Height of contour

Question 23

MATCHING
Characteristics of tooth shape and alignment protect the periodontium,preserve the dentition,and enhance self-cleaning mechanisms.Match each anatomic feature with its most closely related corresponding term.
a.Interdental space
b.Crest of curvature
c.Cervical line
d.Embrasure
e.Occlusal contact
Contact point