Occlusion 3

Question 1

_____ to the teeth are the lips and cheeks that provide _____, but constant ______ directed forces

Answer 1

Labial, relatively light, lingually

Question 2

The tongue provides ______ and _______ directed forces to the ____ surfaces of the teeth

Answer 2

Labially and buccally, lingual

Question 3

The forces from the tongue and cheeks/lips oppose each other and allow the teeth to exist in the _______
This is occurs when there is ____ for the tooth within the arch
What is the definition of this space?

Answer 3

Neutral space
Adequate
Neutral space = the position where labiolingual and buccolingual forces are in equilibrium

Question 4

What factors and forces determine tooth position ?

Answer 4

Musculature, proximal contact, occlusal contact

Question 5

What causes mesial drifting?

Answer 5

Continuous buccolingual and vertical movements during mastication of teeth overtime results in wear of the proximal areas

Question 6

Normal arch alignment is maintained in part due to the ____, which is the contact between _______ teeth

Answer 6

Proximal, adjacent

Question 7

Occlusal contacts prevents the _____ or ______ of teeth, thus maintaining arch ____

Answer 7

Extrusion or supereruption
Arch stability

Question 8

If a tooth is lost, the distal tooth will likely move _____ and the unopposed tooth with likely _____

Answer 8

Mesially, erupt

Question 9

How is the buccoocclusal line established?
In a normal arch, this line flows _____ and ______

Answer 9

An imaginary line extended thru all the buccal cusp tips of the mandibular posterior teeth
Smoothly, continuously

Question 10

How is the linguocclusal line established?

Answer 10

An imaginary line extended through the lingual cusps of maxillary posterior teeth

Question 11

How is the central fossa line established ?
Where are the proximal contact areas in relation to this line?

Answer 11

A third imaginary line extended through the central developmental grooves of the max and many posterior teeth
Proximal contact areas are placed slightly buccal to the CF line

Question 12

The max lingual occlusal line aligns with the ______ in MIC

Answer 12

Mand central fossa line

Question 13

The mand buccolingual occlusal line aligns with ____

Answer 13

Max CF line in MIC

Question 14

What are supporting cusps?

Answer 14

Cusps of teeth that contact in and support maximal intercupsal position

Question 15

Which cusps are normally supporting cusps on the mand & max posterior teeth?

Answer 15

Mand = facial
Max = palatial

Question 16

Non supporting cusps _____ the opposing teeth
What happens if this is lacking?

Answer 16

Overlap
Biting the cheek or tongue

Question 17

Which cusps are normally non supporting cusps in the mand & max?

Answer 17

Max = buccal
Mand =ling

Question 18

Mandibular posterior teeth have a tendency to tip their crowns ____ and roots _______

Answer 18

Lingually, laterally

Question 19

The maxillary posterior teeth keep the crown with a slight ____ inclination and a _______ inclination of the root

Answer 19

Buccal, lingual

Question 20

From a lateral view, all teeth show a slight ________ inclination
Which tooth is a possible exception?

Answer 20

Medial
Max 3rd molars

Question 21

Anterior teeth have a slight ____ protrusion and their crowns seem to incline ______

Answer 21

Labial, laterally
*the anterior teeth tip out to the side and toward the front

Question 22

Overjet can be classifies as _____ overlap

Answer 22

Horizontal

Question 23

Overbite can be classified as ____ overlap

Answer 23

Vertical

Question 24

Occlusal contacts occur when the _______ cusps contact the opposing ________
Where do these cusps typically contact (1 or 2 areas)

Answer 24

Centric, central fossa line
Central fossa areas or marginal ridge and embrasure areas

Question 25

In what type of occlusion does the stamp cusp of one tooth occlude n a single fossa of a single opponent?

Answer 25

Cusp-fossa occlusion

Question 26

In cusp-fossa occlusion, the upper stamp cusps fit into all the ___ of the lower teeth while the lower stamps cusps fit into all the _____ except the _________of _______

Answer 26

Fossae, upper fossae, distal ones, bicuspids

Question 27

In which type of occlusion does each tooth occlude with two opposing teeth?

Answer 27

Cusp- embrasure occlusion

Question 28

What are the advantages of cusp-fossa occlusion?

Answer 28

Fore’s are directed along the long axis of tooth
There is greater stability of entire arch and less tendency towards tooth movement
There is less chance of food impactions between embrasure

Question 29

In normal interarch tooth relationship, each tooth occludes with _____ opposing teeth
Which teeth do not?

Answer 29

Two
Mand central incisiors and max third molars only occlude with one opposing tooth

Question 30

Why is it good to have teeth occluding with two opposing teeth?

Answer 30

Helps maintain arch integrity even when a tooth is lost, since stabilization occlusal contacts are still maintained on all remaining teeth

Question 31

If one or more teeth in the mand arch are located ______ to their max counterparts, the condition that occurs is called _____

Answer 31

Facially, crossbite

Question 32

What is premature contact?
What other structures are affected if there is premature contact ?

Answer 32

One posterior or anterior teeth hits more than others when the jaw closes
This tooth bears more force and is the premature contact area

Muscles of mastication, TMJ, and offending tooth affected

Question 33

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