American Board of Orthodontics (ABO) Practice Exam

According to Proffit, what percentage of advancement patients had a >2mm relapse within 1 year post-operation?

1. 10%

2. 15%

3. 20%

4. 25%

The correct answer is: 20%

The correct answer reflects findings in orthodontic literature, particularly referencing an established source like Proffit’s work on orthodontic treatment and patient outcomes. According to Proffit's studies, it has been observed that a significant percentage of patients who undergo surgical advancement procedures experience a relapse greater than 2mm within the first year following surgery. This information is pivotal because it highlights a critical concern in orthodontic treatment planning and post-operative care. A 20% relapse rate indicates that even with careful planning and execution of surgical interventions, a substantial proportion of patients may not retain their surgical results as intended, prompting the need for close monitoring and possibly adjunctive interventions. Understanding this data contributes to a more comprehensive approach to managing patient expectations and outcomes in orthodontic practice, emphasizing the importance of follow-up and retention strategies following surgical advancements. Knowing this statistic allows practitioners to better prepare their patients for potential post-operative changes, ensuring they are informed about the likelihood of relapse and the importance of adherence to post-operative recommendations.