Exam 2: Occlusion Exam and Eval

Question 1

What is malocclusion?

Answer 1

A CONDITION IN WHICH THERE IS A DEFLECTION FROM THE NORMAL RELATION OF THE TEETH TO OTHER TEETH IN THE SAME ARCH AND/OR TO TEETH IN THE OPPOSING ARCH

Question 2

What are the angle’s classifications?

Answer 2

Based on the relationship of the MB cusp of the MAXILLARY 1st molar & the BUCCAL groove of MANDIBULAR 1st molar

Question 3

What class has the MB cusp of max 1st molar bisects buccal groove of mand 1st molar?

Answer 3

Angle’s Class I

Question 4

What is the definition of class I malocclusion?

Answer 4

SAME AS NORMAL OCCLUSION BUT CHARACTERIZED BY CROWDING, ROTATIONS, AND OTHER POSITIONAL IRREGULARITIES.

Question 5

What class has MB cusp of max 1st molar is mesial to mand 1st molar’s buccal groove?

Answer 5

Angle’s Class II

Question 6

What class is known as an overbite?

Answer 6

Angle’s Class II

Question 7

What class is MB cusp of max. 1st molar is distal to buccal groove of mand 1st molar?

Answer 7

Angle’s Class III

Question 8

What class is known as an underbite?

Answer 8

Angle’s Class III

Question 9

What Angle class is this?

Answer 9

Angle’s Class III

Question 10

What Angle class is this?

Answer 10

Angle’s Class I with severe crowding

Question 11

What Angle class is this?

Answer 11

Angle’s Class II

Question 12

What is overjet?

Answer 12

THE HORIZONTAL OVERLAP OF THE MAXILLARY CENTRAL INCISORS OVER THE MANDIBULAR CENTRAL INCISORS

Question 13

What do you measure overjet with?

Answer 13

periodontal probe

Question 14

What is the average mm of overjet?

Answer 14

2-3 mm

Question 15

What is overbite?

Answer 15

THE VERTICAL OVERLAP OF THE MAXILLARY CENTRAL INCISORS OVER THE MANDIBULAR CENTRAL INCISORS.

Question 16

What is the normal amount of overbite?

Answer 16

2-3 mm
20-30% of the height of the mandibular incisors

Question 17

What is an anterior crossbite?

Answer 17

The horizontal growth of the mandible exceeds the horizontal development of the maxilla, and the lower anterior teeth end up in front of the upper anterior teeth.

Question 18

What type of bite does this show?

Answer 18

anterior crossbite

Question 19

What type of bite does this show?

Answer 19

Posterior crossbite

Question 20

What type of bite does this show?

Answer 20

posterior crossbite

Question 21

The etiology of dental wear is…

Answer 21

multifactorial with complex relationships between attrition, abfraction, abrasion and erosion

Question 22

True or False: dental wear is part of the normal cycle of the dentition.

Answer 22

True

Question 23

What are the categories of erosive tooth wear (ETW)?

Answer 23

 Erosion
 Abfraction
 Abrasion
 Attrition

• classified according to the specific mechanism that is responsible for the wear

Question 24

What is evidence of bruxism?

Answer 24

 Bony ridges-exostosis, tori
 Gingival recession
 Abfractions- loss of cervical area due to bruxism
 Broken teeth & restorations
 Excessive attrition

Question 25

What is evidence of occlusal wear/trauma?

Answer 25

• wear facets
• broken restorations
• chipped teeth

Question 26

What is attrition?

Answer 26

Mechanical wear of the incisal or occlusal surface as a result of functional or para-functional movements of the mandible (tooth-to-tooth contact).

Question 27

What are the facts about attrition?

Answer 27

• bruxism accelerates
• can be age related
• occlusal surfaces match jaw movements and usually have similar degree of wear

Question 28

What condition is this?

Answer 28

bruxism (abfraction)

Question 29

What does this show?

Answer 29

occlusal wear/trauma

Question 30

What erosive tooth wear (ETW) is this?

Answer 30

attrition

Question 31

What erosive tooth wear (ETW) is this?

Answer 31

attrition

Question 32

What is abfraction?

Answer 32

A form of wear along the gingival margin that is not caused by acid activity

Question 33

What does abfraction look like?

Answer 33

• cervical wedge shaped defects

Question 34

What can cause abfraction?

Answer 34

bruxism

Question 35

What erosive tooth wear (ETW) is this?

Answer 35

abfraction

Question 36

What erosive tooth wear (ETW) is this?

Answer 36

abfraction

Question 37

What erosive tooth wear (ETW) is this?

Answer 37

abfraction

Question 38

What is abrasion?

Answer 38

Abnormal tooth surface loss resulting from direct frictional forces between the teeth and external objects or from frictional forces between contacting teeth in the presence of an abrasive medium.

Question 39

What can cause abrasion?

Answer 39

• Improper brushing techniques; most common and usually seen as a sharp, V-shaped notch in the gingival 1/3 of the tooth.
• Habits
• Vigorous use of toothpicks between adject teeth.

Question 40

What most likely causes interproximal abrasion?

Answer 40

toothpicks

Question 41

What most likely causes incisal notching abrasion?

Answer 41

nails
pipe

Question 42

What most likely causes cervical abrasion?

Answer 42

toothbrushing

Question 43

What erosive tooth wear (ETW) is this?

Answer 43

abrasion

Question 44

What is erosion?

Answer 44

Wear or loss of tooth structure by chemicomechanical action.

Question 45

What would cause erosion of facial surface of teeth?

Answer 45

lemons
acidic liquids

Question 46

What would cause erosion of lingual surface of teeth?

Answer 46

bulimia

Question 47

What does bulimia cause to teeth?

Answer 47

 Thinning, chipping of incisal edges
 anterior open bite
 loss of vertical dimension
 “raised” amalgams
 thermal sensitivity