Lec 3: Angle's Classification of Malocclusion

Question 1

Mandibular dental arch is in normal mesiodistal relation to maxillary arch.

Answer 1

Class I malocclusion

Question 2

Mesiobuccal cusp of maxillary 1st permanent molar occludes in the buccal groove of mandibular 1st permanent molar.

Answer 2

Class I malocclusion

Question 3

Mesiolingual cusp of maxillary 1st permanent molar occludes with occlusal fossa of mandibular 1st permanent molar.

Answer 3

Class I malocclusion

Question 4

Rotations, individual tooth malpositions, missing teeth and tooth size discrepancies fall under this classification.

Answer 4

Class I malocclusion

Question 5

In class I, malocclusion is essentially a _____________.

Answer 5

dental dysplasia

Question 6

• Occasionally, mesiodistal relationship of upper + lower 1st molars may be normal.
• Interdigitation of buccal segments correct.
• With no overt tooth malpositions.
• But entire dentition is forward on their respective bases.

Answer 6

Class I Bimaxillary Protrusion

Question 7

• A malocclusion may exist in the presence of abnormal perioral muscle function.
• With a normal mesiodistal 1st molar relationship.
• But with the teeth anterior to 1st molars completely out of contact during full habitual occlusion.

Answer 7

Class I Open Bite

Question 8

Mandibular dental arch + body are in distal relation to maxillary arch.

Answer 8

Class II Malocclusion

Question 9

Mesiobuccal cusp of maxillary 1st permanent molar occludes in the space between mesiobuccal cusp of mandibular 1st permanent molar + distal aspect of mandibular 2nd premolar.

Answer 9

Class II Malocclusion

Question 10

Mesiolingual cusp of maxillary 1st permanent molar occludes mesial to mesio-lingual cusp of mandibular 1st permanent molar.

Answer 10

Class II Malocclusion

Question 11

• Along with molar relation which is typical of class II malocclusion.
• Maxillary incisor teeth are in labioversion.
• It associated with abnormal muscle function.
• Instead of musculature serving as a balancing + stabilizing “splint”: It can become a deforming force.
• With increase in overjet.

Answer 11

Class II Div 1

Question 12

With an increased overjet due to underlying Class II skeletal pattern with incisors of normal inclination.

Answer 12

Class II Div 1

Question 13

A Class I skeletal pattern with an increased overjet due to proclined maxillary incisors and retroclined mandibular incisors.

Answer 13

Class II Div 1

Question 14

• Along with molar relation which is typical of class II malocclusion.
• Maxillary incisors are near normal anteroposteriorly or slightly in linguoversion
• Whereas maxillary lateral incisors are tipped labially and/or mesially.

Answer 14

Class II Div 2

Question 15

Both central + lateral incisors may be lingually inclined + canines labially inclined
- Such occclusion is traumatic;
- Quite damaging to mandibular incisor supporting segment.

Answer 15

Class II Div 2

Question 16

When the Class II molar relationship occurs on one side of dental arch only

Answer 16

Class II Subdivision

Question 17

Mandibular dental arch + body is in mesial relationship to maxillary arch.

Answer 17

Class III malocclusion

Question 18

Mesiobuccal cusp of maxillary 1st molar occluding in the interdental space between the distal aspect of distal cusps of mandibular 1st molar + mesial aspect of mesial cusps of mandibular 2nd molar.

Answer 18

Class III malocclusion

Question 19

• Mandibular incisors are frequently in total crossbite,
  —– Labial to maxillary incisors.
• Lower incisors are inclined excessively to lingual aspect, despite the crossbite.

Answer 19

Class III malocclusion

Question 20

Mandible shifts anteriorly in glenoid fossa due to premature contact of teeth.

Answer 20

Pseudo Class III Malocclusion

Question 21

It is said to exist when Class III malocclusion exists unilaterally.

Answer 21

Class III Subdivision