Overview: This guide helps dental practices identify profitable and predictable clear aligner cases while estimating treatment length using the "Rule of 3" framework.
Evaluate Case Predictability with the Rule of 3
The "Rule of 3" is a framework used to identify case predictability based on specific treatment goals. To use this guide, track how many of the following goals apply to a potential clear aligner case:
Predictable Treatment Goals
Midline Discrepancy: Maximum of 1.5 mm of shift per arch; requires Interproximal Reduction (IPR) and sufficient overjet.
Overjet Reduction: Requires IPR on the maxillary (upper) arch.
Open Bite Reduction: Anterior open bites are highly predictable for only 1–2 mm of closure.
Other Goals: Includes overbite correction, anterior spacing per arch, anterior crowding per arch, and crossbite per teeth.
Estimate Clear Aligner Treatment Duration
Clinicians should use the following thresholds to provide patients with a treatment time range:
Short Duration (6–8 Months): Cases presenting three or fewer treatment goals.
Moderate Duration (12–14 Months):