American Board of Orthodontics (ABO) Practice Exam

What is the typical percentage overexpansion for SARPE procedures?

1. 10-15%

2. 15-20%

3. 25-30%

4. 30-35%

The correct answer is: 25-30%

In the context of Surgically Assisted Rapid Palatal Expansion (SARPE), the typical percentage of overexpansion is specifically about 25-30%. This overexpansion is critical for ensuring that adequate dental and skeletal changes occur during the procedure. The rationale behind this percentage is to account for factors such as relapse and remodeling that can occur post-operatively. The 25-30% figure takes into consideration the elasticity of the palatal tissues and the intended outcome, where a successful expansion can lead to a wider arch for improved occlusion and aesthetics. This level of overexpansion helps orthodontists compensate for natural biological changes that may occur after the appliance is removed, ensuring that the desired arch width is maintained over time. The other percentages suggested do not reflect the established surgical norms for SARPE, making them less suitable for achieving the comprehensive expansion necessary for effective treatment outcomes. Thus, understanding the importance of this specific range is vital for orthodontic professionals involved in planning and executing SARPE.