American Board of Orthodontics (ABO) Practice Exam

The wedge effect in the context of orthodontic extractions, particularly for hyperdivergent treatments, primarily refers to limitations arising from molar extrusion. When extractions are performed, particularly in patients with hyperdivergent growth patterns, there is a tendency for the molars to extrude or move occlusally. This extrusive movement can lead to complications in maintaining the desired occlusal relationships and can adversely affect the vertical dimension of occlusion.

In hyperdivergent individuals, where the dental and skeletal relationships are already influenced by increased facial height, the unwanted molar extrusion can exacerbate the existing conditions, complicating orthodontic treatment. This understanding emphasizes the need to carefully plan extraction patterns and orthodontic mechanics to mitigate the wedge effect and its implications on treatment outcomes.

This contrasts with the other options: positive remodeling of alveolar bone, improved periodontal health, and favorable dental arch length do not succinctly describe the implications or outcomes of the wedge effect as it pertains to the challenges faced during treatment following extractions in hyperdivergent patients.