Podcast
Questions and Answers
What is Class II malocclusion characterized by?
What is Class II malocclusion characterized by?
- Maxilla protrusive, mandible in good position (correct)
- Maxilla in good position, mandible retrusive (correct)
- Both maxilla and mandible protrusive, yet the mandible is less so (correct)
- Maxilla protrusive, mandible retrusive (correct)
What are the principles and goals of Class II correction?
What are the principles and goals of Class II correction?
- Ignore initial facial balance
- Take into account initial facial balance to help develop the treatment plan (correct)
- Establish facial balance by reducing the jaw discrepancy between mandible and maxilla (correct)
- Treat teeth to a Class I occlusion (correct)
What are the main types of Class II malocclusions?
What are the main types of Class II malocclusions?
Class 2 division 1 and Class 2 division 2
In Class II Division I, where is the messy-buccal cusp of the upper first molar positioned?
In Class II Division I, where is the messy-buccal cusp of the upper first molar positioned?
What is represented by 'Duncan' in regards to Class II malocclusion?
What is represented by 'Duncan' in regards to Class II malocclusion?
In a subdivision case, the lower midline is usually off to which side?
In a subdivision case, the lower midline is usually off to which side?
Can you have more than one classification of occlusion in the same patient?
Can you have more than one classification of occlusion in the same patient?
Match the Class II cases with their descriptions:
Match the Class II cases with their descriptions:
What defines Class II Division II malocclusion?
What defines Class II Division II malocclusion?
How was Harrison treated for his Class II, considering lip incompetence?
How was Harrison treated for his Class II, considering lip incompetence?
Without growth, can you get an adaptive growth response from orthodontic forces?
Without growth, can you get an adaptive growth response from orthodontic forces?
What is the main growth and adjustment center for teeth and jaws?
What is the main growth and adjustment center for teeth and jaws?
Study Notes
Class II Malocclusion Types
- Four types of Class II malocclusions are identified based on maxillary and mandibular positions.
- Presence of overjet, jaw discrepancies, and positions affect treatment plans significantly.
Principles of Class II Correction
- Aim to align teeth into a Class I occlusion.
- Consider initial facial balance when developing treatment plans to reduce jaw discrepancies.
Class II Division Variants
- Class II Division 1: Upper first molar is mesially positioned relative to the lower first molar with an overjet exceeding 2.5-3 mm.
- Class II Division 2: Similar molar relationship; however, upper incisors are retroclined and overjet remains more than 2.5-3 mm.
Specific Patient Cases
- Duncan Case: Diagnosed with Class II Division 1, severe overjet (13 mm), deep overbite, and no crossbite. Treated non-extraction due to mild protrusion and available e-space.
- Austin Case: Diagnosed with Class II Division II, normal overjet, deep overbite, and retroclined upper incisors, with mild upper crowding.
Class II Division Similarities and Differences
- Similarity: Both divisions share a similar molar relationship and can be treated to achieve an ideal Class I occlusion.
- Difference: Division 1 can vary in overbite while Division 2 typically presents with a deep overbite.
Subdivisions in Malocclusion
- More than one occlusion classification can be present in a single patient, indicating a subdivision on the non-Class I side.
- For instance, Sabrina's case shows Class II on one side and Class I on the other, with the lower midline deviating towards the Class II side.
Specific Treatments
- Nicholas Case: Class II diagnosis with severe overjet (8 mm) and deep overbite treated without extraction; no crowding or protrusion required.
- Harrison Case: Class II with maxillary protrusion and significant flaring treated via upper bicuspid extraction to reduce protrusion and achieve Class I canines.
- Sheranda Case: Both maxilla and mandible protrusive; treated effectively with bicuspid extraction to alleviate protrusion and lip incompetence.
Treatment Considerations for Protrusion
- Extraction of bicuspids is often necessary when dealing with maxillary protrusion accompanied by lip incompetence, regardless of crowding.
Importance of Growth Centers
- The condyle acts as the main growth and adjustment center for teeth and jaws, allowing adaptive growth response through orthodontic forces.
- Orthodontists utilize braces, wires, and elastics to induce adaptive growth responses in conjunction with tooth movement, facilitating correction of malocclusions.
Adaptive Growth Response Limitations
- Without sufficient jaw growth, adaptive growth responses cannot be achieved through orthodontic forces alone.
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Description
Test your knowledge on Class II malocclusion types and correction principles with these flashcards. Each card provides definitions and insights into treatment planning. Ideal for dental students or professionals looking to refresh their understanding of orthodontic concepts.
