American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

The selected answer highlights a specific research finding regarding canine retraction speed, which is a critical aspect of orthodontic treatment. In the study referenced, the application of a current of 15 microamperes over a period of 14 days was identified as effective in enhancing the retraction speed of canines. This finding suggests that the specific parameters of the current and duration had a significant impact on the biological processes involved in orthodontic movement, possibly by affecting the periodontal tissue response or altering the biomechanical characteristics of tooth movement.

The choice of 15 microamperes for 14 days likely reflects an optimal balance where the current is sufficient to stimulate cellular activity without causing any adverse effects, providing a safe yet effective method for accelerating tooth movement. This parameter configuration aligns with current understanding in orthodontics, where biologically relevant electrical stimulation can promote quicker and more efficient orthodontic tooth movement.

Other options present different current values and durations that were either less effective or outside the scope of the findings, indicating deviations from the optimal parameters that were established for improving the speed of canine retraction.