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

Steiner proposed that for each millimeter of inclination of the teeth, there is an associated gain in arch length of approximately 2 millimeters. This concept is significant in orthodontics, particularly when it comes to understanding the arch expansion and the influence of tooth positioning on overall arch length.

Inclining the teeth affects their position within the dental arch, and this movement is crucial for creating space, correcting alignment, and achieving the desired occlusion. By conceptualizing this relationship, orthodontists can predict how minor changes in the inclination of teeth can lead to substantial improvements in arch length, which is essential when planning treatments for crowding or spacing issues.

The significance of the 2mm gain not only aids in treatment planning but also helps in formulating efficient mechanics during tooth movement. Understanding this principle allows orthodontists to make informed decisions regarding tooth movement strategies and how they will affect the overall dimensions of the arch.