Contacts, Embrasures, COC's, Etc.

Question 1

Line/angle created by junction of facial and proximal surfaces

Answer 1

Facial line angles

Question 2

When viewed from the facial and lingual aspect, how do incisal/occlusal embrasures change from anterior to posterior?

Answer 2

Incisal/occlusal embrasures get bigger from anterior to posterior when viewed from lingual and facial

Question 3

Over time, how do teeth move due to interproximal attrition?

Answer 3

Teeth move mesially - arch shortens

Question 4

Distance of crest of convexity from cervical line on facial and lingual surfaces of mandibular anterior teeth

Answer 4

< .5 mm

Question 5

Distance of crest of convexity from cervical line of lingual surface of mandibular second premolars

Answer 5

¾ mm

Question 6

Line around tooth where enamel and cementum meet

Separates anatomical crown and root

Answer 6

Cervical line

Question 7

Where are mesial/distal contacts of a single tooth in relation to one another?

Answer 7

Distal contacts are more cervical than mesial contacts

EXCEPT mx 1st premolar

Question 8

Functions of proximal contacts

Answer 8

Stabilizes tooth in alveolus and dental arch
Prevent food impaction
Protects interdental papillae by deflecting away food

Question 9

Features of epithelial attachment

Answer 9

Seals soft tissue to tooth
Variable in location
Tendency to migrate apically during life moving from enamel to cementum
Normal attachment follows curvature of CEJ

Question 10

Which tooth is the longest and strongest in both arches

Answer 10

Canine

Question 11

How does the depth of the curvature of the cervical line change from anterior to posterior?

Answer 11

The depth of the curvature of the cervical line on ALL surfaces decreases from anterior to posterior

Question 12

Where is the buccal crest of convexity on posterior teeth?

Answer 12

Cervical third

Question 13

All teeth have distal contacts located more cervically than the mesial contacts EXCEPT

Answer 13

Maxillary 1st premolar

Question 14

How do facial and lingual line angles compare?

Answer 14

Facial line angles are normally more prominent than lingual line angles

Question 15

Generally, where are the facial/lingual crests of convexity in relation to the cervical line?

Answer 15

Less than 1 mm beyond cervical line

Question 16

How does arch change over time?

Answer 16

Becomes shorter because of interproximal attrition

Teeth move mesially

Question 17

Pyrimidal/triangular shaped space between surfaces of adjacent teeth cervical to contact

Answer 17

Interproximal space

Question 18

The mesial and distal terminations of the occlusal surfaces of posterior teeth, and lingual surfaces of anterior teeth

Answer 18

Marginal ridges

Question 19

When viewed from the facial and lingual aspect, how do cervical embrasures (interproximal spaces) change from anterior to posterior?

Answer 19

Cervical embrasures get smaller from anterior to posterior when viewed from facial and lingual

Question 20

How do proximal contacts change with age?

Answer 20

Get bigger
Start out as contact points
Abrading action of teeth over long period of time

Question 21

Attachment of hard tissue (bone) to the tooth’s root structure

Answer 21

Periodontal ligament

Question 22

What are the boundaries of the interproximal space

Answer 22

Interproximal contact - apex
Proximal surfaces - sides
Alveolar crest - base

Question 23

How many roots do anterior teeth normally have?

Answer 23

1

Question 24

How are the central developmental grooves of posterior teeth arranged?

Answer 24

Normally aligned in a continuous groove from tooth to tooth
Provide for trough anterior to posterior through centers of occlusal surface of posterior teeth
Provide for a more efficient food flow pattern during mastication

Question 25

Functions of embrasures

Answer 25

Spillway for food during mastication, reducing forces on teeth Part of self cleansing process of tooth Stimulation of periodontium Anterior embrasure important in esthetics Prevents food impaction through contact areas

Question 26

Attachment of the soft tissue of the mouth to the tooth

Answer 26

Epithelial attachment

Question 27

Greatest areas of contour incisio (occluso)-cervically on the facial and lingual surfaces

Answer 27

Facial and lingual heights of contour (crests of convexity)

Question 28

How do the lingual and buccal crests of convexity compare in posterior teeth?

Answer 28

Lingual crest of convexity is more occlusal than buccal crest of convexity (cervical third)

Question 29

Where is the lingual crest of convexity on anterior teeth?

Answer 29

Cervical third

Question 30

Distance of crest of convexity from cervical line of lingual surface of mandibular molars

Answer 30

1 mm | COC in middle third

Question 31

Features of marginal ridges

Answer 31

Height of marginal ridges of adjacent teeth should be at same level Shaped to creat a small occlusal (posterior) or lingual (anterior) embrasure

Question 32

Opening between the adjacent surfaces of the teeth that widens from the contact points towards the facial, lingual, incisal, occlusal, and cervical surfaces

Answer 32

Embrasure

Question 33

Gingival tissue that fills interproximal space

Answer 33

Gingival papilla (interdental papillae)

Question 34

Imaginary line which marks the level of termination of the soft tissue surrounding the tooth Separates clinical crown and root Variable

Answer 34

Gingival line/crest/margin

Question 35

How many roots do premolars normally have?

Answer 35

1

Question 36

Touching of two surfaces of adjacent teeth

Answer 36

Proximal contact

Question 37

Distance of crest of convexity from the cervical line on the facial and lingual surfaces of all maxillary teeth and the facial surfaces of mandibular posterior teeth

Answer 37

.5 mm

Question 38

Which teeth do not have wider lingual embrasures than facial embrasures? Why?

Answer 38

Maxillary 1st molars Only tooth that is wider mesio-distally on lingual than facial NO LINGUAL TAPER - HAS FACIAL TAPER

Question 39

Another name for interproximal space

Answer 39

Cervical embrasure

Question 40

How do the size of the proximal contacts change from anterior to posterior?

Answer 40

Size of contact areas increase from anterior to posterior

Question 41

Function of crests of convexity

Answer 41

Provide protection and stimulation of gingival tissue | Deflect food away from tissue

Question 42

Describe proximal contacts of posterior teeth

Answer 42

Located slightly facial facio-lingually

Question 43

Describe proximal contacts of anterior teeth

Answer 43

Centered facio-lingually

Question 44

The depth of the curvature of the cervical line is normally greater on which proximal surface?

Answer 44

Mesial

Question 45

How do the cervical line curvatures of adjacent teeth compare?

Answer 45

The cervical line depth of curvature is the same on adjacent proximal surfaces of adjacent teeth

Question 46

Why are lingual embrasures wider than facial embrasures (when viewed from incisal/occlusal) EXCEPT maxillary 1st molars?

Answer 46

Lingual taper

Question 47

Where is the facial crest of convexity on anterior teeth?

Answer 47

Cervical third

Question 48

How many roots do mandibular molars normally have? Where?

Answer 48

2 | 1 mesial, 1 distal

Question 49

When viewed from the incisal/occlusal aspect, how do the lingual and facial embrasures relate to one another (EXCEPT for maxillary 1st molar)?

Answer 49

Lingual embrasures are wider than facial embrasures

Question 50

The crests of convexity on the proximal surfaces are the same as...

Answer 50

The contact areas

Question 51

How do proximal contacts change from anterior to posterior?

Answer 51

Become more cervically located

Question 52

How many roots do maxillary molars normally have? Where are they?

Answer 52

Three | 1 lingual, 2 buccal