Orthodontic Treatment Outcomes with Clear Aligners

Clear aligners have transformed contemporary orthodontic practice by offering a virtually invisible, removable alternative to fixed brackets. Their adoption has risen sharply in adult and adolescent populations seeking aesthetic comfort and improved hygiene. Treatment outcomes with clear aligners are influenced by material properties, digital planning accuracy and the biomechanics of tooth movement. While predictable movements such as bodily molar distalisation and incisor tipping can be achieved with high accuracy, complex rotations and large space closures remain challenging. Patient-reported benefits include reduced discomfort, better periodontal health and shorter chair-time, yet success relies on precise digital setups, appropriate attachment design and regular compliance monitoring.

Research from Nature Portfolio

Advanced methods for monitoring tooth movement have been established through three-dimensional digital model superimposition, enabling highly precise assessment of morphological changes on palatal structures. Through comparison of palatal reference areas, it was shown that superimposition on the medial third of the third rugae yields the most reproducible measurements and minimises error in detecting tooth displacement. In a complementary study, finite element analysis has elucidated the complex interplay of forces during maxillary incisor retraction. Simulations of varying retraction and intrusion protocols reveal that combining intrusion vectors with retraction produces more controlled root movement and highlights the risk of unintended canine extrusion. These insights inform refinements in aligner staging and attachment placement to optimise biomechanical efficiency.

Orthodontic Treatment Outcomes with Clear Aligners publication trend

The graph below shows the total number of articles in orthodontic treatment outcomes with clear aligners across all publications each year (not limited to Nature Index journals).

Technical terms

Clear aligner: A removable, custom-fabricated thermoplastic appliance designed to move teeth incrementally according to a digital treatment plan.

Finite element analysis (FEA): A computer-based method that models and predicts stress and displacement in complex structures, used here to simulate tooth movement under aligner forces.

Digital superimposition: A technique for overlaying serial 3D dental scans to quantify changes in tooth position or hard-tissue morphology over time.

Attachment: A small composite protuberance bonded to a tooth surface to improve force application and enhance specific tooth movements with aligners.

Thermoforming: The process by which a heated polymer sheet is moulded over a dental model to create a clear aligner, which alters the material’s mechanical properties.

References

1. Clinical effectiveness of Invisalign® orthodontic treatment: a systematic review. Progress in Orthodontics (2018).
2. Treatment outcome and efficacy of an aligner technique – regarding incisor torque, premolar derotation and molar distalization. BMC Oral Health (2014).
3. Predictability of orthodontic movement with orthodontic aligners: a retrospective study. Progress in Orthodontics (2017).
4. Assessment of different techniques for 3D superimposition of serial digital maxillary dental casts on palatal structures. Scientific Reports (2017).
5. Clear aligners for maxillary anterior en masse retraction: a 3D finite element study. Scientific Reports (2020).
6. Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study. Dentistry Journal (2020).
7. Direct 3D Printing of Clear Orthodontic Aligners: Current State and Future Possibilities. Materials (2021).