American Board of Orthodontics (ABO) Practice Exam 2025 - Free Orthodontics Practice Questions and Study Guide

The remodeling that masks rotation according to Bjork's implant study specifically refers to the apposition below the symphysis and at the anterior part of the lower mandibular border. This is significant because as the bone undergoes this apposition, it effectively compensates for the rotational changes occurring at the mandible during growth and development. The addition of new bone in these areas can provide stability and support for the teeth, allowing for an improved positioning without altering the overall shape of the mandible significantly.

This concept is particularly important when modeling how the mandible adapts and remodels in response to functional demands and orthodontic treatment. The bone addition helps to maintain a balanced orientation of the mandible, thus contributing to the overall functionality and aesthetic of the occlusion.

In contrast, the other options describe different patterns of bone activity that do not specifically correlate with the masking of rotation. For instance, resorption above the angle of the mandible refers to bone loss that does not primarily influence the rotational dynamics in the same way as apposition in the specified region.