Malocclusion Classification and Definitions

The video tutorial explains the concept of malocclusion, which refers to any abnormal relation among the teeth of the upper and lower jaws. It covers the definition of normal occlusion as introduced by Edward Angel, and details Angle's classification of malocclusion into three classes. Class 1 is the most common, involving misaligned teeth. Class 2 is characterized by a distal relationship of the mandibular teeth, with two divisions based on the position of the incisors. Class 3 involves a mesial relationship, often resulting in a concave facial profile. The video concludes with a call to action for viewers to engage with the content.

What is the primary focus of the video introduction?

• The importance of subscribing to the channel

• The definition of malocclusion

• The history of orthodontics

• The anatomy of the jaw

Who introduced the first clear definition of normal occlusion?

• Edward Angle

• Charles Tweed

• John Smith

• William Proffit

In normal occlusion, where should the cusp of the upper first molar align?

• In the mesial groove of the lower first premolar

• In the distal groove of the lower second molar

• In the occlusal embrasure of the lower canine

• In the buccal groove of the lower first molar

What is the basis for Angle's classification of malocclusion?

• The position of the lower incisors

• The relationship of the maxillary first molar

• The alignment of the upper canines

• The spacing of the anterior teeth

What is used for classification if the first molars are missing?

• The incisors

• The canine relationship

• The premolars

• The second molars

What percentage of malocclusions does Angle's Class 1 account for?

• 80%

• 70%

• 60%

• 50%

What facial profile is associated with Angle's Class 1 malocclusion?

• Concave

• Round

• Convex

• Straight

What is another name for Angle's Class 2 malocclusion?

• Prenormal occlusion

• Subnormal occlusion

• Postnormal occlusion

• Normal occlusion

In Angle's Class 2 Division 1, what is the characteristic of the maxillary incisors?

• Retruded

• Protruded

• Rotated

• Aligned

What is the facial profile of a patient with Angle's Class 3 malocclusion?

• Concave

• Round

• Convex

• Straight