occlusion

Question 1

Mesial Step

Answer 1

Mandibular molars more mesial than maxillary molars
- most children

Question 2

Flush Terminal Plane

Answer 2

Mandibular molars & maxillary molars are even

Question 3

Distal Step

Answer 3

Mandibular molars more distal than maxillary molars
– least common

Question 4

What is the relationship between in Centric Relation?

Answer 4

A relationship of the upper jaw to the lower jaws.

Question 5

What is the relationship between in Centric Occlusion

Answer 5

A relationship of the upper teeth to the lower teeth.

Question 6

What is Centric Relation (CR)?

Answer 6

The most retruded relationship of the mandible to the maxilla, occurring during strong muscle contractions like swallowing.

Question 7

What is the ideal relationship between Centric Relation (CR) and Centric Occlusion (CO)?

Answer 7

CR = CO, meaning the mandible and dentition align at “home base.”

Question 8

What is Centric Occlusion (CO)?

Answer 8

The static position of teeth in opposite arches, also known as habitual, acquired, convenience, intercuspal, or static occlusion.

Question 9

What is Maximum intercuspation in Centric Occlusion?

Answer 9

maximum closure of the maxillary & mandibular arches

Question 10

What is Maximum Interdigitation in Centric Occlusion?

Answer 10

Maximum touching of maxillary & mandibular arches

Question 11

Inter-arch Malocclusions

Answer 11

Midline off center

Question 12

Inter-arch Malocclusions: Posterior crossbite

Answer 12

• Mandibular arch is facial or lingual to maxillary arch
• Unilateral or bilateral
• Incorrect horizontal overlap

Question 13

Inter-arch Malocclusions: Anterior crossbite

Answer 13

• Max incisors lingual to mand incisors
• Incorrect horizontal overlap
• Edge to edge

Question 14

Inter-arch Malocclusions: Edge to edge

Answer 14

anterior teeth

Question 15

Inter-arch Malocclusions: end to end

Answer 15

posterior teeth

Question 16

Inter-arch Malocclusions: Open bite

Answer 16

• Anterior or posterior
• Bilateral or unilateral
• Most frequently – anterior

Question 17

Intra-arch Malocclusions: Supraversion

Answer 17

Above occlusal plane

Question 18

Intra-arch Malocclusions: Infraversion

Answer 18

Below occlusal plane

Question 19

Intra-arch Malocclusions: Drifted mesial

Answer 19

Tooth was extracted

Question 20

Intra-arch Malocclusions: Linguoversion

Answer 20

Tooth positioned more lingual

Question 21

Intra-arch Malocclusions: Torsoversion

Answer 21

Rotated or twisted
Rotated mesial
Rotated distal

Question 22

What is the facial profile of Class I malocclusion?

Answer 22

Mesognathic profile

Question 23

What is the molar relationship of Class I malocclusion?

Answer 23

MB cusp of max 1st molar – buccal groove of mand 1st molar

Question 24

What is the canine relationship of Class I malocclusion?

Answer 24

Max canine lies between mand canine & mand 1st premolar

Question 25

Conditions that occur in Class I malocclusion?

Answer 25

- Malposition – individual teeth or groups of teeth - Crowded anterior teeth Protruded or retruded max incisors - Anterior crossbite - Posterior crossbite - Mesial drift

Question 26

What is the molar relationship of Class II malocclusion?

Answer 26

Buccal groove of mand 1st molar – distal to MB cusp of max 1st molar

Question 27

What is the canine relationship of Class II malocclusion?

Answer 27

**Distal** of mand canine **distal** to mesial surface of max canine (mand canine is further back than before)

Question 28

What is the facial profile of Class II malocclusion division 1 and 2?

Answer 28

Retrognathic profile

Question 29

Conditions that occur in Class II, division 1?

Answer 29

- Mandible retruded, max incisors protruded - Deep overbite - Excessive overjet - Abnormal muscle function - Short mandible - Short upper lip

Question 30

Conditions that occur in Class II, division 2?

Answer 30

- Mandible retruded, one or more max incisors retruded - Max laterals protrude, max centrals retrude - Crowded max anterior teeth Deep overbite

Question 31

What is the facial profile of Class III malocclusion?

Answer 31

Prognathic profile

Question 32

What is the molar relationship of Class III malocclusion?

Answer 32

Buccal groove of mand 1st molar – mesial to MB cusp of max 1st molar

Question 33

What is the canine relationship of Class III malocclusion?

Answer 33

Distal of mand canine mesial to mesial of max canine

Question 34

Conditions that occur in Class III

Answer 34

- Anterior crossbite - Max & mand incisors edge-to-edge occlusion - Crowded mand incisors

Question 35

What is Overjet?

Answer 35

Horizontal overlap - Maxilla overlap Mandible - Whole arch

Question 36

What is Overbite

Answer 36

Vertical overlap - Overlap of anterior teeth