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Invisalign – Clear Aligners Explained

Invisalign is a modern orthodontic system that straightens teeth using custom-made, clear removable aligners – a discreet alternative to traditional braces.

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Things worth knowing about "Invisalign"

Invisalign is a modern orthodontic system that straightens teeth using custom-made, clear removable aligners – a discreet alternative to traditional braces.

What is Invisalign?

Invisalign is an orthodontic treatment system that gradually moves teeth into their desired position using a series of custom-made, transparent plastic trays known as aligners. Unlike conventional braces with metal brackets and wires, Invisalign aligners are nearly invisible and can be removed for eating, drinking, and brushing teeth.

The system was developed in the United States in the late 1990s and has since become one of the most widely used clear aligner systems in orthodontics worldwide.

When is Invisalign Used?

Invisalign is suitable for treating a wide range of dental misalignments in teenagers and adults. Common indications include:

Crowding (teeth that are too close together)
Spacing (gaps between teeth, also called diastema)
Overbite: upper front teeth overlap the lower teeth too much
Deep bite
Crossbite
Open bite
Mild to moderate dental misalignment

In cases of severe orthodontic problems or skeletal jaw discrepancies, Invisalign may have limitations. Traditional braces or a combination of orthodontics and jaw surgery may be more appropriate in such situations.

How Does Invisalign Work?

The Invisalign treatment process involves several steps:

1. Consultation and Digital Planning

The orthodontist or dentist first takes a digital 3D scan of the patient's teeth. Using the proprietary ClinCheck® software, the entire treatment is simulated virtually – allowing the patient to preview the expected outcome before treatment even begins.

2. Aligner Fabrication

Based on the digital plan, individual aligner trays are manufactured from a special, BPA-free plastic material called SmartTrack®. Each aligner differs slightly from the previous one, applying precise and controlled pressure to specific teeth.

3. Wearing the Aligners

The aligners are worn in a prescribed sequence, typically for 1 to 2 weeks per tray. For optimal results, aligners should be worn for at least 20 to 22 hours per day.

4. Progress Check-Ups

Regular follow-up appointments with the treating provider (every 6 to 8 weeks) ensure that tooth movement is progressing as planned.

5. Retention Phase

After the active treatment phase is complete, retainers (fixed or removable) are used to hold the teeth in their new positions and prevent relapse.

Advantages of Invisalign

Nearly invisible: The clear trays are barely noticeable in daily life
Removable: No restrictions on eating or oral hygiene
Comfortable: No brackets or wires that may irritate the mouth
Predictable results: Thanks to digital 3D treatment planning
Fewer office visits may be required compared to traditional braces

Disadvantages and Potential Risks

Requires discipline: Aligners must be worn consistently – poor compliance leads to suboptimal outcomes
Speech changes: Slight difficulty speaking may occur during the adjustment period
Cost: Invisalign is generally more expensive than traditional braces and is usually not covered by standard health insurance
Limitations in complex cases: Not suitable for all types of misalignment
Attachments: Small tooth-colored composite bumps (called attachments) may be bonded to the teeth to aid more complex tooth movements – these are slightly visible

Cost and Insurance Coverage

The cost of Invisalign treatment varies depending on the complexity of the case, the number of aligners required, and the treating provider. In many countries, costs typically range from $3,000 to $8,000 USD (or equivalent). Most standard health insurance plans do not cover Invisalign as it is considered an elective cosmetic treatment, unless the misalignment is medically significant. Some private dental insurance plans may offer partial reimbursement.

Invisalign vs. Traditional Braces

Whether Invisalign or traditional braces is the better choice depends on the individual patient's clinical situation. Invisalign excels in aesthetics and comfort for mild to moderate cases, while fixed braces may be more effective for complex tooth movements and do not rely on patient compliance for wear time.

References

Align Technology, Inc. – Invisalign Clinical Studies and Evidence. Available at: www.aligntech.com (accessed 2024)
Rossini G, Parrini S, Castroflorio T, Deregibus A, Debernardi CL. – Efficacy of clear aligners in controlling orthodontic tooth movement: a systematic review. Angle Orthodontist, 2015;85(5):881–889.
American Association of Orthodontists (AAO) – Clear Aligners Patient Information. Available at: www.aaoinfo.org (accessed 2024)

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