Predictability of anterior teeth intrusion overcorrection design and its influencing factors: deep bite correction...

This study aims to assess the clinical outcomes of anterior teeth intrusion overcorrection using clear aligners in deepbite patients and to investigate potential factors associated with the clinically achieved overcorrection amount.

Twenty-four patients with deepbite (13-50 years, mean age 26.3 years; 17 females, 7 males) treated with Invisalign incorporating overtreatment were retrospectively reviewed. Pre- and post-treatment intraoral scans were superimposed using anatomical landmarks and aligned with ClinCheck models. Overbite reduction, and the differences between the simulated and achieved movements of individual anterior teeth were measured. Linear regression analyses were performed to identify variables potentially influencing intrusion outcomes.

The mean overbite reduction was 3.3 mm, and the overall accuracy of intrusion was 52.2%. Maxillary and mandibular incisors achieved 0.7-1.8 mm of intrusion (47.3%-55.0%), whereas the canines showed lower intrusion (0.2-0.5 mm, 23.1%-29.0%). Regression analysis suggested initial overbite, mandibular plane angle, upper incisor inclination, ANB angle and the use of Class II elastics as variables that may be associated with achieved intrusion.

A strategically designed occlusal setup-characterized by a fusiform anterior open bite, deepened maxillary occlusal curve, and reverse curve of Spee in the mandible-may facilitate effective deep bite correction with clear aligners.

This study presents a potentially effective and minimally invasive protocol for deepbite correction with clear aligners, drawing biomechanical inspiration from the reverse curve of Spee, commonly used in fixed orthodontics. Patient-specific anatomical and treatment-related factors appear to influence outcomes and should be taken into account in treatment planning.