In clear aligner treatment, before the aligners are made, a digital simulation is prepared showing how the teeth will move from start to finish. This simulation is an important tool both for planning treatment and for communication between patient and orthodontist. It does, however, need to be interpreted correctly.
How is the simulation prepared?
- An intraoral scan creates a three-dimensional digital model of the teeth.
- Photos and X-rays are assessed together with this model.
- The orthodontist sets the target tooth positions and the order of the movements.
- The software divides these movements across the number of aligners and shows them step by step.
- The orthodontist reviews the plan, requests changes if needed and approves it.
What does the simulation show?
- The planned movements of the teeth and their order
- The estimated number of aligners
- Which teeth will have attachments
- The areas and amount of interproximal reduction (IPR)
- The target bite relationship
What doesn't it show?
- The biological response of teeth varies from person to person; some teeth may move more slowly than planned.
- The final appearance of the gums and lips is not fully reflected in the simulation.
- Gaps in aligner wear are not part of the plan.
For this reason, aligner fit is assessed at check-ups during treatment and the plan is updated with additional aligners if needed.
Questions to ask when reviewing the simulation
- Which teeth will have attachments?
- Is IPR needed, on which teeth and how much?
- Will I need to wear elastics?
- What are the estimated duration and number of aligners?
- How does it work if additional aligners are needed?
- What will retention look like after treatment?
How it relates to smile design
In cases with high aesthetic expectations, the simulation can be assessed together with digital smile design. This way the position of the teeth, gum levels and any later aesthetic procedures are handled in a single plan.
For all the steps of the process, see our clear aligner treatment process page.
