Occulsion

Question 1

What is occulsion?

Answer 1

Relationship between Maxillary and mandibular teeth when jaw is in fully closed position.

Question 2

What are the 3 phases of arch form?

Answer 2

1) Anterior teeth
2) Middle- premolars
3) Posterior teeth

Question 3

When does occlusion develop in a child?

Answer 3

as primary teeth ERUPT

Question 4

Occlusion of erupting permanent dentition is dependent on primary teeth shedding with the exception of ______?

Answer 4

Permeant molars; these erupt distal to primary dentition.

Question 5

Occlusion develops in the permanent dentition as primary teeth are ______?

Answer 5

Shed

Question 6

Teeth are one factor of occlusion, what are other factors?

Answer 6

Musculature
Neuromuscular patterns,
TMJ function
Tongue functions
Orofacial behaviors/habits

Question 7

What are some factors to poor occlusion?

Answer 7

• Periodontium cant function properly
  -Recession
  -Occlusal trauma
  -Difficult for pt to keep clean

Question 8

When teeth are properly aligned in occlusion what occurs?

Answer 8

-Teeth are self cleansing by cheek musculature & saliva

Question 9

T or F - Occlusal trauma is NOT a direct cause of perio disease, but it may be an adverse factor in already weak disease dentition

Answer 9

True

Question 10

What is centric occlusion/ Habitual occlusion/ maximum Intercuspation?

Answer 10

Voluntary position that allows maximum contact when teeth occlude. “Tightest fit”

Question 11

T or F Normal or ideal occlusion rarely exist?

Answer 11

True

Question 12

Each tooth is in occlusion with TWO other teeth in the opposing arch. Which teeth are the exceptions?

Answer 12

Mandibular Central incisors & Maxillary third molars

Question 13

What happens to occlusion if a tooth is lost?

Answer 13

Supereruption
Mesial drift
loss of proper function

Question 14

When teeth occlude in CO, the maxillary arch HORIZONTALLY overlaps the mandibular arch, this is referred to as?

Answer 14

Overjet

• think jets fly horizontal

Question 15

How many mm is considered normal Overjet?

Answer 15

1-3mm

Question 16

In CO maxillary arch also vertically overlaps the mandibular arch which is referred to as ______?

Answer 16

Overbite

Question 17

What is considered normal overbite?

Answer 17

2-5mm or 20-30%
Max teeth cover incisal 1/3 of mandibular teeth

Question 18

What is another name for underbite

Answer 18

Retrognatha

Question 19

When the mandibular arch extends beyond the maxillary arch this is called?

Answer 19

Underbite

Question 20

Each tooth have two adjacent contacts except which one?

Answer 20

Third molars

Question 21

When two teeth in the same arch come into contact, the curvatures next to the contact areas form spaces called?

Answer 21

Embrasure spaces “V shaped”

Question 22

Open contacts allow food impaction from opposing cusps resulting in tissue trauma, the opposing cusps are called ______?

Answer 22

Plunging cusps

Question 23

How many phases in arch development?

Answer 23

5

Question 24

What occurs in phase 1 of arch development?

Answer 24

permanent first molars erupt

Question 25

What occurs in phase two of arch development?

Answer 25

Eruption of permanent anterior teeth

Question 26

What occurs in phase 3 of arch development?

Answer 26

begins when permanent premolars erupt

Question 27

What occurs in phase 4 of arch development?

Answer 27

begins when permanent canines erupt between laterals and 1st premolars

Question 28

What occurs in phase 5 of arch development?

Answer 28

Final phase; dental arch form and eruption of 3rd molars

Question 29

What is curve of spee?

Answer 29

Anteroposterior curve ( Imaginary line on masticatory surface)

Question 30

In curve of spee Maxillary arch _______ and mandibular arch ______?

Answer 30

Convex ; concaves

Question 31

Curve of wilson?

Answer 31

Concave curve through molars

Question 32

What are the 3 areas of centric stops?

Answer 32

1) Height of cusp contour 2) Marginal ridges 3) Central fossae

Question 33

What is the defintion of centric stops?

Answer 33

Supporting cusps that function during centric occulsion

Question 34

What are the supporting cusps? (function during mastication)

Answer 34

Maxillary palatal (lingual cusps) and mandibular buccal cusps

Question 35

what is used to check centric stops?

Answer 35

articulating paper

Question 36

This process continues until there is wear and attrition until development of a flat surface is considered a _____?

Answer 36

Wear facet

Question 37

When is centric relation? (Retruded contact position)

Answer 37

Most posterior position of mandible carried by musclature and ligaments (end point)

Question 38

CO can be attained by having a patient who is in CR squeeze ______?

Answer 38

teeth together after achieving CR. * occurs during swallowing

Question 39

Rare but ideal permanent occlusion is when ______?

Answer 39

CR & CO are in occlusion

Question 40

What is lateral occlusion or canine rise?

Answer 40

moving mandible side to side until opposing canines are edge to edge.

Question 41

All 8 incisiors are in contact as mandible protrudes, this is called?

Answer 41

Protrusive occlusion

Question 42

What is ideal primary occlusion?

Answer 42

terminal plane or mesial step

Question 43

What is non-ideal molar relationship in primary occulsion?

Answer 43

Distal step

Question 44

when teeth are in centric occlusion, each tooth of one arch is in occlusion with two others of the opposing arch...except for?

Answer 44

anterior

Question 45

What is open bite?

Answer 45

When teeth DO NOT occlude

Question 46

What maloccluision is an end to end bite?

Answer 46

Anterior teeth are edge to edge in CO

Question 47

What malocclusion is a cross bite?

Answer 47

Mandibular teeth are FACIALLY to maxillary teeth

Question 48

For primary occlusion what is flush terminal plane mean?

Answer 48

Primary molars and mandibular 2nd molars are end to end

Question 49

What facial profile is a class I?

Answer 49

Mesognathic

Question 50

What facial profile is class II malocclusion?

Answer 50

Retrognathic (retrusive) or convex

Question 51

What facial profile is Class III malocclusion?

Answer 51

Prognathic (Protrusive)

Question 52

How many occlusal contacts for 32 teeth?

Answer 52

138

Question 53

What can malocculsion attritube to ?

Answer 53

Tooth wear, bone loss, loose teeth, joint pain

Question 54

Most common problem of malocclusion?

Answer 54

Crowding

Question 55

Malocculsion occurs in what percentage of teens/kids?

Answer 55

80%

Question 56

What is class I malocclusion?(Nuetroculsion)?

Answer 56

-MB cups of max 1st molar occludes w/ MB groove of mand 1st molar -max canine occludes w/ distal 1/2 of mand canine & mesial half of mand 1st premolar

Question 57

What is class II malocclusion relationship? (distocclusion)

Answer 57

Molar- max 1st occludes mesial to MB groove of mand 1st molar Canine- Distal of mand canine to distal mesial of max canine by width of premolar

Question 58

Class III malocculsion relationship? (mesioclusion)

Answer 58

molar- MB cusp of max 1st molar occludes distal of MB groove of mand 1st canine- distal surface of mand canine is distal to mesial of maxillary canine

Question 59

Mandibular anteriors are in crossbite with maxillary anteriors in what class?

Answer 59

Class III

Question 60

Which class has a prognathic prominent mandible with normal or retrusive (concave profile) maxillary?

Answer 60

Class III

Question 61

What are parafunctional habits?

Answer 61

Movements of mandible within normal range of motion associated w/ mastication, speech, respiraton movements.

Question 62

Example of parafunctional habits?

Answer 62

Clenching, Bruxism, Thumb sucking

Question 63

What are parafunctional habits related to?

Answer 63

Attrition, scalloped tongue, non carious cervical lesion, linea alba

Question 64

Treatment for parafunctional habits?

Answer 64

Myofunctional therapy or oral appliances

Question 65

T OR F classifications dont work for primary or mixed dentition?

Answer 65

True

Question 66

What is Class II division I?

Answer 66

Severe overjet & deep overbite Incisors are proclined.

Question 67

What is Class II Division II?

Answer 67

Maxillary anterior show lingual inclination and may overlap canine or incisors. excessive deep bite / reduced overjet