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

Replacement resorption, also known as ankylosis, is primarily associated with dental injuries that lead to the resorption of the tooth structure and ultimately result in the fusion of the tooth to the alveolar bone. Luxation injuries, which include lateral luxation and intrusion, are particularly significant because they disrupt the periodontal ligament and the surrounding structures.

In the case of a luxation injury, the displacement of the tooth can lead to damage of the supporting tissues, causing the periodontal ligament fibers to be compromised. As healing occurs, the tooth may fail to reestablish normal periodontal ligament attachment, leading to the process of replacement resorption where the root surface is replaced by bone, resulting in ankylosis.

Other types of injuries, such as crown fractures or avulsions, typically do not present the same implications for replacement resorption. While avulsed teeth can also lead to resorption issues, the mechanism and likelihood associated with luxation injuries are more directly linked to the process of replacement resorption due to the disruption of the periodontal ligament's functional attachment.