Angle's Classification of Malocclusion - Orthodontics
TLDRThe video script discusses malocclusion, which refers to the abnormal or incorrect alignment of the upper and lower teeth. It explains that normal occlusion, a concept established over a century ago, involves the proper alignment of molars and canines, creating a smoothly curved line of occlusion. The script delves into Angle's classification of malocclusion into three classes: Class I, the most common, where molar and canine relationships are normal except for misaligned teeth; Class II, characterized by a distal relationship of the mandibular molar and a convex facial profile; and Class III, where the maxillary first molar is posterior to the mandibular first molar, resulting in a concave facial profile. The video aims to educate viewers on these classifications and the importance of proper dental alignment.
Takeaways
- 🦷 **Normal Occlusion**: An ideal occlusion is a concept introduced by the orthodontic profession, with the upper first molars being key to occlusion.
- 📏 **Line of Occlusion**: A normal occlusion is characterized by a smoothly curving line from the occlusal surfaces of posterior teeth to the incisal edges of anterior teeth.
- 🦴 **Angle's Classification**: Malocclusion is categorized into three classes based on the relationship of the maxillary first molar to the mandibular jaw.
- 👥 **Class One Malocclusion**: The most common type, with the molar and canine relationship resembling normal occlusion but with misaligned or malplaced teeth.
- 📏 **Class One Canine Relationship**: In a normal class one, the maxillary canine's meal incline aligns with the distal incline of the lower canine.
- 🦉 **Class Two Malocclusion**: Also known as disto occlusion, where the mandibular teeth are distal to the maxillary teeth, resulting in a convex facial profile.
- 🦷 **Class Two Divisions**: Class two is further divided into division 1, with proclined maxillary incisors, and division 2, with retroclined maxillary incisors.
- 📏 **Class Two Overjet**: In class two division one, an overjet over 6 mm is considered great, and anything above 9 mm is extreme.
- 🦇 **Class Three Malocclusion**: Known as prenormal or mesio occlusion, where the maxillary first molar's cusp is posterior to the mandibular first molar's groove, leading to a concave facial profile.
- 🤔 **Understanding Malocclusion**: The video aims to help viewers understand the different types of malocclusion and their impact on facial profiles.
- 👍 **Engagement Encouraged**: The speaker encourages viewers to like, subscribe, share, and comment if they find the video helpful, and to ask questions for further clarification.
Q & A
What does the term 'malocclusion' refer to in dentistry?
-Malocclusion refers to any abnormal or incorrect relation among teeth of the upper and lower jaws.
Who introduced the first clear definition of normal occlusion?
-Edward Angle introduced the first clear and simple definition of normal occlusion.
What is the significance of the upper first molars in normal occlusion?
-The upper first molars are key to occlusion, and they should be related to the lower first molars in such a way that the maxillary cusp of the upper first molar occludes in the buccal groove of the lower first molar.
What does a smoothly curving line of occlusion mean?
-A smoothly curving line of occlusion means having all teeth well aligned and in proper position, so that the line running from the occlusal surfaces of posterior teeth and the incisal edges of anterior teeth is a smoothly curved line.
How is Angle's classification of malocclusion based on the maxillary first molar?
-Angle's classification is based on the relative position of the maxillary first molar to the other teeth in the mandibular jaw when closing the teeth.
What is the definition of a normal class one canine relationship?
-In a normal class one canine relationship, the maxillary canine's mesial incline lands on the distal incline of the lower canine, and the distal incline of the upper canine coincides with the lower first premolar mesial incline.
What is the most common type of malocclusion and what percentage of malocclusions does it account for?
-Angle class one malocclusion is the most common type, accounting for about 70% of malocclusions.
What is the characteristic facial profile of a patient with Angle class two malocclusion?
-A patient with Angle class two malocclusion will have a convex facial profile.
How is class two division one malocclusion characterized in terms of maxillary incisors and overjet?
-In class two division one malocclusion, the maxillary incisors are proclined, and if the overjet is over 6 mm, it is considered great, with anything above 9 mm being extreme.
What is the defining feature of an Angle class three malocclusion?
-In an Angle class three malocclusion, the maxillary first molar's cusp is posterior to the mandibular first molar's buccal groove, or in other words, the maxillary first molar's cusp lies in the occlusion embrasure of the lower first and second molars.
What is the facial profile characteristic of a patient with Angle class three malocclusion?
-A patient with Angle class three malocclusion will have a concave facial profile.
What is the implication of a reversed overjet in Angle class three malocclusion?
-A reversed overjet, which is less than 0 mm, implies an anterior crossbite in Angle class three malocclusion.
Outlines
📢 Introduction and Understanding Malocclusion
The first paragraph introduces the topic of malocclusion, which refers to any abnormal or incorrect relation among the teeth of the upper and lower jaws. It explains the concept of normal occlusion, which is a construct by the orthodontic profession over a century ago. Edward Angle provided a definition stating that the upper first molars are key to occlusion, and they should relate to the lower first molars in a specific way. The paragraph also describes the Angle's classification system based on the position of the maxillary first molar and its relation to the mandibular jaw, and outlines the three classes of malocclusion: Class I, the most common; Class II, also known as disto occlusion; and Class III, known as prenormal or mesio occlusion. The facial profiles associated with each class are also mentioned.
Mindmap
Keywords
💡Malocclusion
💡Normal Occlusion
💡Angles Classification
💡Class One Malocclusion
💡Class Two Malocclusion
💡Class Three Malocclusion
💡Overjet
💡Mandibular First Molar
💡Maxillary First Molar
💡Facial Profile
💡Occlusal Embrasure
Highlights
Malocclusion refers to any abnormal or incorrect relation among teeth of the upper and lower jaws
Normal occlusion is a concept constructed by the orthodontic profession over 100 years ago
Edward Angle introduced the first clear definition of normal occlusion, stating the upper first molars are key
In normal occlusion, all teeth are well aligned and in proper position with a smoothly curving line of occlusion
Angle's classification is based on the relative position of the maxillary first molar to other teeth in the mandibular jaw
In a normal Class I canine relationship, the maxillary canine's mesial incline lands on the distal incline of the lower canine
Angle Class I malocclusion, the most common type, resembles normal occlusion except for misaligned or malpositioned teeth
Class II malocclusion, also known as disto occlusion, is defined when the mandibular teeth are distal to the maxillary teeth
Class II Division 1 accounts for 90% of Class II malocclusions, with proclined maxillary incisors
In Class II Division 1, an overjet over 6 mm is considered great and over 9 mm is extreme
Class II Division 2 involves retroclined maxillary incisors, making up the remaining 10% of Class II malocclusions
Angle Class III malocclusion, or mesio occlusion, occurs when the maxillary first molar's cusp is posterior to the mandibular first molar's groove
In Class III malocclusion, the overjet is reversed (less than 0 mm), indicating an anterior crossbite
Patients with Class III malocclusion have a concave facial profile
The video provides a clear explanation of the three classes of malocclusion and their characteristics
Understanding malocclusion and its classification is crucial for orthodontic treatment planning
The video uses simple language and clear visuals to explain complex concepts in orthodontics
The video is helpful for both patients and professionals looking to understand malocclusion and its impact
Transcripts
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