Question 1

Each of the following can be damaged by an overhanging restoration EXCEPT one.Which one is the EXCEPTION?&#10;A) Contact point&#10;B) Marginal gingiva&#10;C) Plaque retention&#10;D) Alveolar bone&#10;E) Contact area

Accepted Answer

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.&#10;A) Both statements are true.&#10;B) The first statement is true;the second statement is false.&#10;C) The first statement is false;the second statement is true.&#10;D) Both statements are false.

Accepted Answer

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&#10;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.&#10;a.Interdental space&#10;b.Crest of curvature&#10;c.Cervical line&#10;d.Embrasure&#10;e.Occlusal contact&#10;CEJ

Accepted Answer

CEJ stands for "cementoenamel junction," which is where the enamel of the tooth meets the cementum of the tooth's root. The CEJ is an important anatomic feature because it helps protect the periodontium by providing a barrier between the tooth and the gums. It also plays a role in preserving the dentition by helping to distribute forces during biting and chewing.

Question 4

Which illustration depicts an overcontoured restoration?&#10;A)  &#10;B)  &#10;C)

Accepted Answer

Illustration "C" depicts an overcontoured restoration.The arrows indicate that food is being deflected in such a way that the gingival tissue is neither stimulated nor cleaned by the frictional action of food.Also apparent are mesial and distal contours that do not replicate the natural shape of the tooth.

Question 5

Height of contour is the same as&#10;A) embrasure&#10;B) crest of curvature&#10;C) alignment&#10;D) proximal contact&#10;E) width of tooth

Accepted Answer

Height of contour is also called crest of curvature and relates to the curvature of the cervical line,or the CEJ.The height of the contour impacts periodontal attachment in that a higher contoured cervical line affords more cementum on which bone can attach itself.The periodontal attachment follows the cervical line and connects the gingiva to the cementum.

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.

Accepted Answer

Both statements correctly describe features of embrasures.The terms embrasure and spillway are often used synonymously.In addition to shunting food and self-cleansing aspects,effective embrasures permit a slight amount of gingival stimulation by frictionally massaging food.Poorly contoured embrasures decrease the beneficial aspects of embrasures and lead to accumulation of plaque,debris,and food.

Question 7

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

Accepted Answer

A contact point differs from a contact area.A contact point is where the occlusal cusp of one tooth touches the occlusal portion of another tooth in the opposing arch.By contrast,contact areas of teeth are the areas where the proximal surfaces touch one another.The contact area,more formally called the proximal contact area,prevents food from packing between two adjacent teeth.

Question 8

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

Accepted Answer

While it may seem that deep pits,fissures,or holes in enamel make cleaning difficult,these structures have numerous beneficial aspects.By serving as spillways during mastication,pits and fissures enable food to pass around teeth.This action prevents food from being forced interproximally.Pits and fissures facilitate interdigitation of opposing cusps during grinding of food,which dissipates extreme occlusal forces.Along with these beneficial aspects,deep pits and fissures promote plaque retention.

Question 9

MATCHING&#10;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.&#10;a.Interdental space&#10;b.Crest of curvature&#10;c.Cervical line&#10;d.Embrasure&#10;e.Occlusal contact&#10;Spillway

Accepted Answer

The spillway, also known as the embrasure, is the V-shaped space between adjacent teeth that allows for self-cleaning mechanisms and prevents food from impacting between the teeth.

Answer: B
 The crest of curvature is the highest point on the buccal and lingual surfaces of a tooth that contribute to proper alignment and occlusion.

Answer: C
 The cervical line, also known as the cementoenamel junction, is the point where the tooth's crown meets the root and serves as a boundary between the enamel and cementum, which are both important components for protecting the tooth.

Answer: A
 The interdental space, also known as the interproximal space, is the area between adjacent teeth where the gum tissue is located. Proper tooth alignment is important for maintaining healthy gum tissue and preventing periodontal disease.

Answer: E
 Occlusal contact refers to the way in which the upper and lower teeth meet and function during biting and chewing. Proper alignment and occlusion help to protect the periodontium and preserve the dentition.

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.

Accepted Answer

Interproximal spaces are triangular-shaped spaces in all regions of the mouth.The contact area forms the apex of the triangle,the proximal surfaces form the sides,and the alveolar bone makes up the base.

Question 11

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

Accepted Answer

The answer of The facial crest of curvature for all...

Question 12

Each of the following is part of the periodontium EXCEPT one.Which one is the EXCEPTION?&#10;A) Enamel&#10;B) Cementum&#10;C) Free gingiva&#10;D) Alveolar mucosa&#10;E) Alveolar bone

Accepted Answer

The answer of Each of the following is part of...

Question 13

A molar with little or no curvature on the buccal surface would result in&#10;A) open contact area&#10;B) overstimulation of gingiva&#10;C) inadequate stimulation of gingiva&#10;D) difficult oral hygiene access

Accepted Answer

The answer of A molar with little or no curvature...

Question 14

Each of the following is a characteristic of contact areas EXCEPT one.Which one is the EXCEPTION?&#10;A) Stabilize teeth&#10;B) Discourage food impaction&#10;C) Are located in middle third of tooth&#10;D) Protect interdental papilla&#10;E) All are true.

Accepted Answer

The answer of Each of the following is a characteristic...

Question 15

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

Accepted Answer

The answer of An overhanging restoration extends above the occlusal...

Question 16

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

Accepted Answer

The answer of The curvature of the CEJ is generally...

Question 17

Each of the following statements is true of the curvature of the CEJ EXCEPT one.Which one is the EXCEPTION?&#10;A) The curvature of the cervical line,or CEJ,depends on the height of the contact area.&#10;B) The curvature of the cervical line,or CEJ,depends on the diameter of the crown.&#10;C) The mandibular anterior teeth show the greatest amount of curvature of the cervical line.&#10;D) The more anterior the tooth,the greater is the curvature of the cervical line.

Accepted Answer

The answer of Each of the following statements is true...

Question 18

What are the arrows pointing to in the illustration below?&#10; &#10;A) Contact areas&#10;B) Height of curvature&#10;C) Buccal contour&#10;D) Excess curvature&#10;E) None of the above

Accepted Answer

The answer of What are the arrows pointing to in...

Question 19

Each of the following is a function of embrasures EXCEPT one.Which one is the EXCEPTION?&#10;A) Provide self-cleansing from the contact area&#10;B) Reduce occlusal trauma&#10;C) Discourage food impaction&#10;D) Prevent gingival stimulation

Accepted Answer

The answer of Each of the following is a function...

Question 20

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

Accepted Answer

The answer of Alignment refers to the height or level...

Question 21

MATCHING&#10;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.&#10;a.Interdental space&#10;b.Crest of curvature&#10;c.Cervical line&#10;d.Embrasure&#10;e.Occlusal contact&#10;Interproximal space

Accepted Answer

The answer of MATCHING&#10;Characteristics of tooth shape and alignment protect...

Question 22

MATCHING&#10;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.&#10;a.Interdental space&#10;b.Crest of curvature&#10;c.Cervical line&#10;d.Embrasure&#10;e.Occlusal contact&#10;Height of contour

Accepted Answer

The answer of MATCHING&#10;Characteristics of tooth shape and alignment protect...

Question 23

MATCHING&#10;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.&#10;a.Interdental space&#10;b.Crest of curvature&#10;c.Cervical line&#10;d.Embrasure&#10;e.Occlusal contact&#10;Contact point

Accepted Answer

The answer of MATCHING&#10;Characteristics of tooth shape and alignment protect...

Deck 3: Fundamental and Preventive Curvatures