Class II Malocclusion Flashcards

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.

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.