Analysis of overcorrection to be included for planning clear aligner therapy: a retrospective study

Abstract

Objectives To provide clinical information on overcorrection to be included in the initial digital setup to make clear aligner therapy (CAT) more efficient. Materials and Methods Prescription data for 150 patients (80 women and 70 men; mean age 33.7 ± 12.7 years) treated successfully with CAT (F22 Aligners, Sweden & Martina, Due Carrare, Italy) and requiring only a single, minimal finishing phase were acquired retrospectively. The inclusion criteria were Class I dental malocclusion with only minimal crowding (≤3 mm), 12–20 aligner steps per arch, no use of auxiliaries or interarch elastics, and rotations ≤25° for round-shaped teeth. The prescribed and corrective movements to be achieved in the main and finishing treatment phases, respectively, were quantified by the dedicated clear aligner setup software. The magnitudes of inclination (buccal-lingual crown tipping), angulation (mesial-distal crown tipping), rotation, intrusion, and extrusion were extracted and analyzed by tooth type, maxilla and mandible, and both arches. Descriptive statistics, that is, mean, standard deviation, and percentage, were calculated for each movement investigated. Classification and regression trees (CART) were generated using the model-based recursive partitioning approach, and the corrective movements were correlated with respect to both the amount of the movements prescribed and the tooth type. Statistical significance was set at 5%. Results Inclination and rotation required the greatest correction, whereas angulation, intrusion, and extrusion required only minimal correction. Expressed as a percentage of prescribed movement, mean corrective movements were 20.5% for inclination, 14.5% angulation, 28.4% rotation, 11.7% extrusion, and 22% intrusion. According to CART, all corrective movements except extrusion depended on both tooth type and the magnitude of prescribed movement. Conclusions To achieve more efficient CAT, approximately 20% overcorrection should be added to the initial planning phase when planning challenging movements such as inclination and rotation.

Effects of overtreatment with different attachment positions on maxillary anchorage enhancement with clear aligners: a finite element analysis study

“…Overtreatment has been widely employed in clear aligners to improve its efficiency [ 8 ]. In extraction cases of the posterior region, overtreatment manifests as preset distal tipping [ 9 ].…”

Clear Aligner Therapy: Up to date review article

“…Using CAT, these movements can be accomplished by gradually adjusting the shape of the clear aligners to apply gentle pressure to the teeth over time [ Figure 4 ]. [ 55 56 ].…”

Predictability of Dental Distalization with Clear Aligners: A Systematic Review

“…To achieve a more efficient CAT, you need to add approximately 20% overcorrection to the initial planning phase when planning challenging movements such as tilt and rotation. The amount of overcorrection, however, to be added to the initial planning depends on the amount of movement prescribed and the type of tooth involved [71,103]. This information is valuable for improving the effectiveness and efficiency of CAT, reducing the need for additional refinement steps and making the treatment more economical and rapid [71].…”