American Board of Orthodontics (ABO) Practice Exam 2026 – All-in-One Resource to Master Your Orthodontics Certification!

A high SN-MP angle in Class II patients indicates an increased vertical relationship between the sella and the menton. This can often be associated with a thin maxillary alveolus. A thin alveolus suggests reduced buccolingual width or height of the alveolar bone, which can lead to complications such as susceptibility to periodontal issues or challenges during orthodontic treatment.

In Class II malocclusions, particularly when there is a vertical excess, the teeth can be positioned more palatally relative to the alveolar bone. This configuration can affect the overall stability and health of the dental structures, helping clinicians understand the anatomical changes that occur in these cases. The relationship between the skeletal pattern and the morphology of the alveolus is critical for planning effective orthodontic treatment and understanding potential treatment outcomes.